CA1132985A - Ketal and thioketal derivatives of mercaptoacyl prolines - Google Patents
Ketal and thioketal derivatives of mercaptoacyl prolinesInfo
- Publication number
- CA1132985A CA1132985A CA341,486A CA341486A CA1132985A CA 1132985 A CA1132985 A CA 1132985A CA 341486 A CA341486 A CA 341486A CA 1132985 A CA1132985 A CA 1132985A
- Authority
- CA
- Canada
- Prior art keywords
- methyl
- hydrogen
- mercapto
- proline
- oxopropyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 235000013930 proline Nutrition 0.000 title description 8
- 150000003148 prolines Chemical class 0.000 title description 4
- 150000001875 compounds Chemical class 0.000 claims abstract description 50
- 229960002429 proline Drugs 0.000 claims description 125
- 238000000034 method Methods 0.000 claims description 108
- 125000000217 alkyl group Chemical group 0.000 claims description 63
- 239000001257 hydrogen Substances 0.000 claims description 63
- 229910052739 hydrogen Inorganic materials 0.000 claims description 63
- 239000002253 acid Substances 0.000 claims description 37
- -1 polymethylene chain Polymers 0.000 claims description 35
- 230000008569 process Effects 0.000 claims description 28
- 229910052717 sulfur Inorganic materials 0.000 claims description 28
- 150000003839 salts Chemical class 0.000 claims description 27
- 150000002431 hydrogen Chemical class 0.000 claims description 25
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 25
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- 125000006239 protecting group Chemical group 0.000 claims description 10
- HGJZUVHTFSPDPZ-MQWKRIRWSA-N (2s)-4,4-dimethoxy-1-(2-methyl-3-sulfanylpropanoyl)pyrrolidine-2-carboxylic acid Chemical compound COC1(OC)C[C@@H](C(O)=O)N(C(=O)C(C)CS)C1 HGJZUVHTFSPDPZ-MQWKRIRWSA-N 0.000 claims description 8
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 8
- 150000003573 thiols Chemical class 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- ONIBWKKTOPOVIA-UHFFFAOYSA-N Proline Natural products OC(=O)C1CCCN1 ONIBWKKTOPOVIA-UHFFFAOYSA-N 0.000 claims description 6
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 claims description 6
- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 claims description 6
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 claims description 6
- HXEACLLIILLPRG-YFKPBYRVSA-N L-pipecolic acid Chemical class [O-]C(=O)[C@@H]1CCCC[NH2+]1 HXEACLLIILLPRG-YFKPBYRVSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 125000004414 alkyl thio group Chemical group 0.000 claims description 5
- HXEACLLIILLPRG-RXMQYKEDSA-N l-pipecolic acid Chemical class OC(=O)[C@H]1CCCCN1 HXEACLLIILLPRG-RXMQYKEDSA-N 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- XYZNAPXKDLKKRG-ZETCQYMHSA-N (2s)-4,4-diethoxypyrrolidine-2-carboxylic acid Chemical compound CCOC1(OCC)CN[C@H](C(O)=O)C1 XYZNAPXKDLKKRG-ZETCQYMHSA-N 0.000 claims description 3
- PTCYIWMGYCDFJR-MLWJPKLSSA-N (3s)-6,9-dioxo-2-[3,3,3-trifluoro-2-(sulfanylmethyl)propanoyl]-2-azaspiro[4.4]nonane-3-carboxylic acid Chemical compound C1N(C(=O)C(CS)C(F)(F)F)[C@H](C(=O)O)CC21C(=O)CCC2=O PTCYIWMGYCDFJR-MLWJPKLSSA-N 0.000 claims description 3
- 150000003147 proline derivatives Chemical class 0.000 claims description 3
- 230000002633 protecting effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- MHRDCHHESNJQIS-UHFFFAOYSA-N 2-methyl-3-sulfanylpropanoic acid Chemical compound SCC(C)C(O)=O MHRDCHHESNJQIS-UHFFFAOYSA-N 0.000 claims 7
- 125000001589 carboacyl group Chemical group 0.000 claims 4
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims 4
- 125000001475 halogen functional group Chemical group 0.000 claims 2
- WRHPVRWALQQWHH-UHFFFAOYSA-N 1,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylic acid Chemical compound C1NC(C(=O)O)CC21OCCO2 WRHPVRWALQQWHH-UHFFFAOYSA-N 0.000 claims 1
- LZTCBZBNEBUGFG-UHFFFAOYSA-N 3,3,3-trifluoro-2-(sulfanylmethyl)propanoic acid Chemical compound OC(=O)C(CS)C(F)(F)F LZTCBZBNEBUGFG-UHFFFAOYSA-N 0.000 claims 1
- 150000001298 alcohols Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000543 intermediate Substances 0.000 abstract description 12
- 230000001077 hypotensive effect Effects 0.000 abstract 1
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 174
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 135
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 83
- 239000000047 product Substances 0.000 description 77
- 239000000243 solution Substances 0.000 description 66
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 61
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 52
- 239000002904 solvent Substances 0.000 description 42
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 41
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 39
- 239000007787 solid Substances 0.000 description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 33
- 229910021529 ammonia Inorganic materials 0.000 description 30
- 229910001868 water Inorganic materials 0.000 description 30
- 239000010410 layer Substances 0.000 description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 26
- 238000001816 cooling Methods 0.000 description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- XBPCUCUWBYBCDP-UHFFFAOYSA-N Dicyclohexylamine Chemical class C1CCCCC1NC1CCCCC1 XBPCUCUWBYBCDP-UHFFFAOYSA-N 0.000 description 23
- 239000000203 mixture Substances 0.000 description 23
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 22
- VLKZOEOYAKHREP-UHFFFAOYSA-N hexane Substances CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 22
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 21
- 229960000443 hydrochloric acid Drugs 0.000 description 21
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 20
- 239000008346 aqueous phase Substances 0.000 description 20
- 235000011167 hydrochloric acid Nutrition 0.000 description 20
- 239000012044 organic layer Substances 0.000 description 20
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 16
- 239000003921 oil Substances 0.000 description 16
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 description 14
- 229910052786 argon Inorganic materials 0.000 description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- 238000001704 evaporation Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 238000003756 stirring Methods 0.000 description 12
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 11
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 11
- 230000008020 evaporation Effects 0.000 description 11
- RPLLCMZOIFOBIF-NSHDSACASA-N (2s)-4-oxo-1-phenylmethoxycarbonylpyrrolidine-2-carboxylic acid Chemical compound OC(=O)[C@@H]1CC(=O)CN1C(=O)OCC1=CC=CC=C1 RPLLCMZOIFOBIF-NSHDSACASA-N 0.000 description 10
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 10
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 description 10
- 229910000343 potassium bisulfate Inorganic materials 0.000 description 9
- JTNCEQNHURODLX-UHFFFAOYSA-N 2-phenylethanimidamide Chemical compound NC(=N)CC1=CC=CC=C1 JTNCEQNHURODLX-UHFFFAOYSA-N 0.000 description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 8
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 8
- 150000003946 cyclohexylamines Chemical class 0.000 description 8
- 150000002148 esters Chemical class 0.000 description 8
- 235000011121 sodium hydroxide Nutrition 0.000 description 8
- 229940083608 sodium hydroxide Drugs 0.000 description 8
- 125000000446 sulfanediyl group Chemical group *S* 0.000 description 8
- 239000006188 syrup Substances 0.000 description 8
- 235000020357 syrup Nutrition 0.000 description 8
- ONIBWKKTOPOVIA-BYPYZUCNSA-N L-Proline Chemical compound OC(=O)[C@@H]1CCCN1 ONIBWKKTOPOVIA-BYPYZUCNSA-N 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 7
- 229910052740 iodine Inorganic materials 0.000 description 7
- 238000010899 nucleation Methods 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 239000011780 sodium chloride Substances 0.000 description 7
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 102100025597 Caspase-4 Human genes 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- 229920002261 Corn starch Polymers 0.000 description 6
- 101100273284 Homo sapiens CASP4 gene Proteins 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 6
- 125000001584 benzyloxycarbonyl group Chemical group C(=O)(OCC1=CC=CC=C1)* 0.000 description 6
- 239000008120 corn starch Substances 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 239000011630 iodine Substances 0.000 description 6
- UKVIEHSSVKSQBA-UHFFFAOYSA-N methane;palladium Chemical compound C.[Pd] UKVIEHSSVKSQBA-UHFFFAOYSA-N 0.000 description 6
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 description 6
- 150000004702 methyl esters Chemical class 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 159000000000 sodium salts Chemical class 0.000 description 6
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 6
- GUBGYTABKSRVRQ-QKKXKWKRSA-N Lactose Natural products OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)C(O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O GUBGYTABKSRVRQ-QKKXKWKRSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- GKIRPKYJQBWNGO-OCEACIFDSA-N clomifene Chemical compound C1=CC(OCCN(CC)CC)=CC=C1C(\C=1C=CC=CC=1)=C(\Cl)C1=CC=CC=C1 GKIRPKYJQBWNGO-OCEACIFDSA-N 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 125000005843 halogen group Chemical group 0.000 description 5
- 239000008101 lactose Substances 0.000 description 5
- 235000019359 magnesium stearate Nutrition 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- CUKWUWBLQQDQAC-VEQWQPCFSA-N (3s)-3-amino-4-[[(2s)-1-[[(2s)-1-[[(2s)-1-[[(2s,3s)-1-[[(2s)-1-[(2s)-2-[[(1s)-1-carboxyethyl]carbamoyl]pyrrolidin-1-yl]-3-(1h-imidazol-5-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-3-methyl-1-ox Chemical compound C([C@@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](C)C(O)=O)NC(=O)[C@@H](NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@@H](N)CC(O)=O)C(C)C)C1=CC=C(O)C=C1 CUKWUWBLQQDQAC-VEQWQPCFSA-N 0.000 description 4
- 101800000734 Angiotensin-1 Proteins 0.000 description 4
- 102400000344 Angiotensin-1 Human genes 0.000 description 4
- 206010020772 Hypertension Diseases 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 4
- 125000002252 acyl group Chemical group 0.000 description 4
- 238000005917 acylation reaction Methods 0.000 description 4
- 125000005907 alkyl ester group Chemical group 0.000 description 4
- ORWYRWWVDCYOMK-HBZPZAIKSA-N angiotensin I Chemical compound C([C@@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](CC(C)C)C(O)=O)NC(=O)[C@@H](NC(=O)[C@H](CCCN=C(N)N)NC(=O)[C@@H](N)CC(O)=O)C(C)C)C1=CC=C(O)C=C1 ORWYRWWVDCYOMK-HBZPZAIKSA-N 0.000 description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 4
- 239000002934 diuretic Substances 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000007858 starting material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- SFSROLZHCPCODJ-WCCKRBBISA-N (2s)-4-oxopyrrolidine-2-carboxylic acid;hydrobromide Chemical compound Br.OC(=O)[C@@H]1CC(=O)CN1 SFSROLZHCPCODJ-WCCKRBBISA-N 0.000 description 3
- UUUHXMGGBIUAPW-UHFFFAOYSA-N 1-[1-[2-[[5-amino-2-[[1-[5-(diaminomethylideneamino)-2-[[1-[3-(1h-indol-3-yl)-2-[(5-oxopyrrolidine-2-carbonyl)amino]propanoyl]pyrrolidine-2-carbonyl]amino]pentanoyl]pyrrolidine-2-carbonyl]amino]-5-oxopentanoyl]amino]-3-methylpentanoyl]pyrrolidine-2-carbon Chemical compound C1CCC(C(=O)N2C(CCC2)C(O)=O)N1C(=O)C(C(C)CC)NC(=O)C(CCC(N)=O)NC(=O)C1CCCN1C(=O)C(CCCN=C(N)N)NC(=O)C1CCCN1C(=O)C(CC=1C2=CC=CC=C2NC=1)NC(=O)C1CCC(=O)N1 UUUHXMGGBIUAPW-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 102000005862 Angiotensin II Human genes 0.000 description 3
- 101800000733 Angiotensin-2 Proteins 0.000 description 3
- 108010064733 Angiotensins Proteins 0.000 description 3
- 102000015427 Angiotensins Human genes 0.000 description 3
- JZUFKLXOESDKRF-UHFFFAOYSA-N Chlorothiazide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC2=C1NCNS2(=O)=O JZUFKLXOESDKRF-UHFFFAOYSA-N 0.000 description 3
- YXHKONLOYHBTNS-UHFFFAOYSA-N Diazomethane Chemical compound C=[N+]=[N-] YXHKONLOYHBTNS-UHFFFAOYSA-N 0.000 description 3
- 229930194542 Keto Natural products 0.000 description 3
- 229930182821 L-proline Natural products 0.000 description 3
- 102000004270 Peptidyl-Dipeptidase A Human genes 0.000 description 3
- 108090000882 Peptidyl-Dipeptidase A Proteins 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 3
- 230000010933 acylation Effects 0.000 description 3
- 125000003342 alkenyl group Chemical group 0.000 description 3
- 125000000304 alkynyl group Chemical group 0.000 description 3
- 229960003805 amantadine Drugs 0.000 description 3
- 239000000908 ammonium hydroxide Substances 0.000 description 3
- 229950006323 angiotensin ii Drugs 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 125000001309 chloro group Chemical group Cl* 0.000 description 3
- 230000001882 diuretic effect Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 125000001153 fluoro group Chemical group F* 0.000 description 3
- 150000004820 halides Chemical class 0.000 description 3
- 229960002003 hydrochlorothiazide Drugs 0.000 description 3
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 3
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 3
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- KJIFKLIQANRMOU-UHFFFAOYSA-N oxidanium;4-methylbenzenesulfonate Chemical compound O.CC1=CC=C(S(O)(=O)=O)C=C1 KJIFKLIQANRMOU-UHFFFAOYSA-N 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 235000015497 potassium bicarbonate Nutrition 0.000 description 3
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 3
- 239000011736 potassium bicarbonate Substances 0.000 description 3
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- TZBHHPYGZROULI-UHFFFAOYSA-N s-(3-chloro-2-methylsulfanyl-3-oxopropyl) ethanethioate Chemical compound CSC(C(Cl)=O)CSC(C)=O TZBHHPYGZROULI-UHFFFAOYSA-N 0.000 description 3
- 241000894007 species Species 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
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- NDTSRXAMMQDVSW-UHFFFAOYSA-N benzthiazide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(S(N2)(=O)=O)=C1N=C2CSCC1=CC=CC=C1 NDTSRXAMMQDVSW-UHFFFAOYSA-N 0.000 description 1
- 229960001541 benzthiazide Drugs 0.000 description 1
- HSDAJNMJOMSNEV-UHFFFAOYSA-N benzyl chloroformate Chemical compound ClC(=O)OCC1=CC=CC=C1 HSDAJNMJOMSNEV-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000005997 bromomethyl group Chemical group 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- MAEIEVLCKWDQJH-UHFFFAOYSA-N bumetanide Chemical compound CCCCNC1=CC(C(O)=O)=CC(S(N)(=O)=O)=C1OC1=CC=CC=C1 MAEIEVLCKWDQJH-UHFFFAOYSA-N 0.000 description 1
- 229960004064 bumetanide Drugs 0.000 description 1
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 1
- 229960001523 chlortalidone Drugs 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000012230 colorless oil Substances 0.000 description 1
- 239000013066 combination product Substances 0.000 description 1
- 229940127555 combination product Drugs 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- PYRZPBDTPRQYKG-UHFFFAOYSA-N cyclopentene-1-carboxylic acid Chemical compound OC(=O)C1=CCCC1 PYRZPBDTPRQYKG-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 231100000676 disease causative agent Toxicity 0.000 description 1
- 150000004662 dithiols Chemical class 0.000 description 1
- 229940030606 diuretics Drugs 0.000 description 1
- 239000002552 dosage form Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- AVOLMBLBETYQHX-UHFFFAOYSA-N etacrynic acid Chemical compound CCC(=C)C(=O)C1=CC=C(OCC(O)=O)C(Cl)=C1Cl AVOLMBLBETYQHX-UHFFFAOYSA-N 0.000 description 1
- 229960003199 etacrynic acid Drugs 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- MDKXBBPLEGPIRI-UHFFFAOYSA-N ethoxyethane;methanol Chemical compound OC.CCOCC MDKXBBPLEGPIRI-UHFFFAOYSA-N 0.000 description 1
- 239000002024 ethyl acetate extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- RGUQWGXAYZNLMI-UHFFFAOYSA-N flumethiazide Chemical compound C1=C(C(F)(F)F)C(S(=O)(=O)N)=CC2=C1NC=NS2(=O)=O RGUQWGXAYZNLMI-UHFFFAOYSA-N 0.000 description 1
- 229960003028 flumethiazide Drugs 0.000 description 1
- 238000001640 fractional crystallisation Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 229960003883 furosemide Drugs 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 229940082195 hydrochlorothiazide 12.5 mg Drugs 0.000 description 1
- 238000007327 hydrogenolysis reaction Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229960002591 hydroxyproline Drugs 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 150000007529 inorganic bases Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000007918 intramuscular administration Methods 0.000 description 1
- 238000007912 intraperitoneal administration Methods 0.000 description 1
- 238000001990 intravenous administration Methods 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- AWIJRPNMLHPLNC-UHFFFAOYSA-N methanethioic s-acid Chemical compound SC=O AWIJRPNMLHPLNC-UHFFFAOYSA-N 0.000 description 1
- AWJZTPWDQYFQPQ-UHFFFAOYSA-N methyl 2-chloroprop-2-enoate Chemical compound COC(=O)C(Cl)=C AWJZTPWDQYFQPQ-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000004292 methyl p-hydroxybenzoate Substances 0.000 description 1
- 235000010270 methyl p-hydroxybenzoate Nutrition 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229960002216 methylparaben Drugs 0.000 description 1
- 235000019813 microcrystalline cellulose Nutrition 0.000 description 1
- 239000008108 microcrystalline cellulose Substances 0.000 description 1
- 229940016286 microcrystalline cellulose Drugs 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 1
- ACTNHJDHMQSOGL-UHFFFAOYSA-N n',n'-dibenzylethane-1,2-diamine Chemical compound C=1C=CC=CC=1CN(CCN)CC1=CC=CC=C1 ACTNHJDHMQSOGL-UHFFFAOYSA-N 0.000 description 1
- SYSQUGFVNFXIIT-UHFFFAOYSA-N n-[4-(1,3-benzoxazol-2-yl)phenyl]-4-nitrobenzenesulfonamide Chemical class C1=CC([N+](=O)[O-])=CC=C1S(=O)(=O)NC1=CC=C(C=2OC3=CC=CC=C3N=2)C=C1 SYSQUGFVNFXIIT-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical group OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000007911 parenteral administration Methods 0.000 description 1
- 235000019371 penicillin G benzathine Nutrition 0.000 description 1
- 125000006340 pentafluoro ethyl group Chemical group FC(F)(F)C(F)(F)* 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- 210000002381 plasma Anatomy 0.000 description 1
- 229960005483 polythiazide Drugs 0.000 description 1
- 229920000046 polythiazide Polymers 0.000 description 1
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- MFDFERRIHVXMIY-UHFFFAOYSA-N procaine Chemical compound CCN(CC)CCOC(=O)C1=CC=C(N)C=C1 MFDFERRIHVXMIY-UHFFFAOYSA-N 0.000 description 1
- 229960004919 procaine Drugs 0.000 description 1
- ZJLMKPKYJBQJNH-UHFFFAOYSA-N propane-1,3-dithiol Chemical group SCCCS ZJLMKPKYJBQJNH-UHFFFAOYSA-N 0.000 description 1
- RZWZRACFZGVKFM-UHFFFAOYSA-N propanoyl chloride Chemical compound CCC(Cl)=O RZWZRACFZGVKFM-UHFFFAOYSA-N 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000004405 propyl p-hydroxybenzoate Substances 0.000 description 1
- 235000010232 propyl p-hydroxybenzoate Nutrition 0.000 description 1
- 235000013772 propylene glycol Nutrition 0.000 description 1
- 229960003415 propylparaben Drugs 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- IOVGROKTTNBUGK-SJCJKPOMSA-N ritodrine Chemical compound N([C@@H](C)[C@H](O)C=1C=CC(O)=CC=1)CCC1=CC=C(O)C=C1 IOVGROKTTNBUGK-SJCJKPOMSA-N 0.000 description 1
- XEYWOETXQNDSED-UHFFFAOYSA-N s-(3-chloro-3-oxopropyl) ethanethioate Chemical compound CC(=O)SCCC(Cl)=O XEYWOETXQNDSED-UHFFFAOYSA-N 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009491 slugging Methods 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- LXMSZDCAJNLERA-ZHYRCANASA-N spironolactone Chemical compound C([C@@H]1[C@]2(C)CC[C@@H]3[C@@]4(C)CCC(=O)C=C4C[C@H]([C@@H]13)SC(=O)C)C[C@@]21CCC(=O)O1 LXMSZDCAJNLERA-ZHYRCANASA-N 0.000 description 1
- 229960002256 spironolactone Drugs 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008174 sterile solution Substances 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- YBRBMKDOPFTVDT-UHFFFAOYSA-N tert-butylamine Chemical compound CC(C)(C)N YBRBMKDOPFTVDT-UHFFFAOYSA-N 0.000 description 1
- 239000003451 thiazide diuretic agent Substances 0.000 description 1
- AGHANLSBXUWXTB-UHFFFAOYSA-N tienilic acid Chemical compound ClC1=C(Cl)C(OCC(=O)O)=CC=C1C(=O)C1=CC=CS1 AGHANLSBXUWXTB-UHFFFAOYSA-N 0.000 description 1
- 229960000356 tienilic acid Drugs 0.000 description 1
- 229960001288 triamterene Drugs 0.000 description 1
- 229960004813 trichlormethiazide Drugs 0.000 description 1
- GKASDNZWUGIAMG-UHFFFAOYSA-N triethyl orthoformate Chemical group CCOC(OCC)OCC GKASDNZWUGIAMG-UHFFFAOYSA-N 0.000 description 1
- 125000002221 trityl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C([*])(C1=C(C(=C(C(=C1[H])[H])[H])[H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008215 water for injection Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
- C07D491/02—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains two hetero rings
- C07D491/10—Spiro-condensed systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/12—Antihypertensives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/04—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
- C07D207/10—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/16—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
- C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
- C07D495/10—Spiro-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D497/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having oxygen and sulfur atoms as the only ring hetero atoms
- C07D497/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having oxygen and sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
- C07D497/10—Spiro-condensed systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
Abstract
ABSTRACT
This invention is directed to compounds of the formula
This invention is directed to compounds of the formula
Description
H~180a I~TAL AN~ M~IOKETAL DERI~ATIV~S OF MERCAPTOACYL
PROLINES
_ This invention relates to new derivatives of mercaptoacyl prolines and pipecolic acids of formula I and salts thereof (I) Il l2 ~C~
/ \, R4 R3 l (H21)p (I 2)q R5-S-(CH)m-C -C N - C*COOR
R and R6 are independently selected from hydrogen and lower alkyl pr~vided that R6 is lower alkyl only if R3 is also lcwer alkyl.
R3 and R4 are independently selected from hydrogen, lower alkyl, lower alkylthio, -(CH2)n-SH, and halo substituted lower alkyl.
Xl, X2 and X3 are independently selected from oxygen and sulfur.
Rl and R2 are independently selected from lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, halo substituted lower alkyl, hydroxy substituted lower alkyl, r~~~
( 2)n ~ (CH2?n~
R7 x3 ~L
. ;.
..
, , :; :
. .
~ ~ -ll~Z98~
HA180a
PROLINES
_ This invention relates to new derivatives of mercaptoacyl prolines and pipecolic acids of formula I and salts thereof (I) Il l2 ~C~
/ \, R4 R3 l (H21)p (I 2)q R5-S-(CH)m-C -C N - C*COOR
R and R6 are independently selected from hydrogen and lower alkyl pr~vided that R6 is lower alkyl only if R3 is also lcwer alkyl.
R3 and R4 are independently selected from hydrogen, lower alkyl, lower alkylthio, -(CH2)n-SH, and halo substituted lower alkyl.
Xl, X2 and X3 are independently selected from oxygen and sulfur.
Rl and R2 are independently selected from lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, halo substituted lower alkyl, hydroxy substituted lower alkyl, r~~~
( 2)n ~ (CH2?n~
R7 x3 ~L
. ;.
..
, , :; :
. .
~ ~ -ll~Z98~
HA180a
-2-and -(CH2) ~ J or Rl and R2 join in a polymethyl-ene chain to complete an unsubstituted or substituted S- or 6-membered ring.
When Rl and R2 are joined together in a polymethylene chain of 2 or 3 carbons, these cyclic ketal and thioketals can be represented as follows:
Rlo Rg 10~ 9 10 ~ Rg ~(C)t~\ ~(C)t~ /(C)t \~ . ~.~ \~
wherein t is 2 or 3 and Rg and Rlo are both hydrogen, both lower alkyl, or one is hydrogen and the other is lower alkyl, halo substituted lower alkyl, hydroxy substituted lower alkyl, ( 2 n ~ R7 ~(CH2)n~ ~ , or (CH2) `X3 N
Preferably, only one carbon of the polymethylene chain will be substituted.
R7 is hydrogen, lower alkyl of 1 to 4 carbons, espe-cially methyl, lower alkoxy of 1 to 4 carbons, especially methoxy, lcwer alkylthio of 1 to 4 car~ons, especially methylthio, chloro, bramo, fluoro, trifluor~methyl, or hydroxy.
R5 is hydrogen, a hydrolyzably removable protect-ing group, a chemically removable protecting group, or when R3 and R~ are other than -(CH2)n-SH a sulfide of the formula .13Z9t35 _3_ HAl80a Il l2 ~ C /
,~ \
S (H2C)p ~CH2)q l~ l3 ~
-~-(CH)m-C- C N C-COOR
m is zero, one, or two.
n is one, two or three.
p and q are each one or two provided that both are not two.
The asterisk in the above formula indicates a center of asymmetry in the ring. In the case of proline, i.e., p and q are both one, this center is in the L-configuration. In the case of pipecolic acid, i.e., one of p and q is two, this center is in the D, L or L-configuration.
Asymmetric centers can also be present in the mercaptoacyl sidechain depending upon the definition of R3, R4 and R6. Another assymmetric center may also be present in the ring when ~-Rl and X2-R2 are different. The products can accordingly exist in stereoisomeric forms or as racemic mLxtures thereof. All of these æe within the scope of the invention. The synthesis described below can utilize the racemate or one of the enantiomers as starting materials. ~hen the racemic starting material is used in the synthesis procedure, the stereoisomers obtained in final product can be separated by conventional chromatographic or fractional crystallization methods.
: . .
:. ' :: -~s _4_ HA180a Preferably, if there is an asymmetric center in the mercaptoacyl sidechain, it is in the D-confi~uration.
s This invention in its broadest aspect relates to the mercaptoacyl derivatives of proline and pipe-colic acid having formula I above and to salts thereof, to compositions containing such compounds and to the method for using such compounds as anti-hypertensive agents. This invention is also directed to certain novel intermediates useful in the preparation of compounds of formula I.
The term lower alkyl as used in defining the y , R1, R2, R3, R4, and R6 are straight or branched chain hydrocarbon radicals having up to seven carbons, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, iso-pentyl, etc. The preferred lower alkyl groups are up to four carbons with methyl and ethyl being most preferred. Similarly, the terms lower alkoxy and lower alkylthio refer to such lower alkyl groups attached to an oxygen or sulfur.
The term cycloalkyl refers to saturated rings of 3 to 7 carbon atoms with cyclohexyl being most preferred.
The term halo substituted lower alkyl refers to such lower alkyl groups described above in which one or more hydrogens have been replaced by chloro, bromo or fluoro groups such as trifluoromethyl, pentafluoroethyl, 2,2,2-trichloroethyl, chloromethyl, :. ~
. . . . . . .
, .......... ..
.: :
.
, .
,. .
\
1132~85 HA180a bromomethyl, etc.
The term hydroxy substituted lower alkyl refers to such lower alkyl groups described above in which one hydrogen has been replaced by a hydroxy group such as hydroxymethyl, 2-hydroxyethyl, etc.
The term lower alkenyl as used in defining the symbols Rl and R2 are mono-saturated straight or branched chain hydrocarbon groups of from 2 to 7 carbons such as ethenyl, propenyl, isopropenyl, butenyl, and the like. The lower alkynyl groups are straight or branched chain hydrocarbon groups of from 2 to 7 carbons having one triple bond, e.g., propargyl. The preferred lower alkenyl groups are from 2 to 5 carbons and the preferred lower alkynyl groups are from 2 to 4 carbon atoms.
The term hydrolyzably removable protecting group employed in defining R5 refers to a group that can be removed by conventional hydrolysis or o ammonolysis. Acyl groups of the formula are suitable for this purpose wherein R8 can be lower alkyl of 1 to 7 carbons, lower alkyl substituted with one or more chloro, bromo or fluoro groups, -(CH2)r-cycloalkyl, an aryl group such as ( 2)r ~ ; a hetero group such as -(C~2) ~ , or -(CH2)r ~ wherein r is zero, one, two or three, and R7 and X3 are as defined above.
:~
.,. --':. ' ' ~ . i ,, ~:, ", - ,, .".
. - ~. :. .
1~3Z985 ~ 80a Preferred groups are the lower alkanoyl groups hav-ng up to four carbons, especially acetyl, and benzoyl.
The term chemically removable protecting group employed in defining R5 refers to groups such as p-methoxybenzyl, p-methoxybenzyloxycarbonyl, trityl, t-butoxycarbonyl, etc. These groups can be removed after the completion of the acylation reaction by various means depending upon the definition of Xl-Rl and X2-R2 such as by treatment with trifluoro-acetic acid and anisole, sodium and liquidammonia, or mercuric trifluoroacetate. Preferred compounds of formula I are the L-proline containing derivative, i.e., p and q are both one, and R is hydrogen.
With respect to the mercaptoacyl sidechain, preferred as final products are those compounds wherein R5 is hydrogen; m is zero or one; R4 is hydro-gen; and R3 and R6 are both lower alkyl of 1 to 4 carbons, especially both methyl, or R6 is hydrogen and R3 is hydrogen, lower alkyl of 1 to 4 carbons, especially methyl, trifluoromethyl, methylthio, or mercaptomethyl. .~lso preferred as both intermediates and final products are the above sidechains wherein R5 is lower alkanoyl or 1 to 4 carbons, especially acetyl, or benzoyl.
Especially preferred as final products are the compounds of formula I having the mercaptoacyl sidechain wherein R5 is hydrogen; m is one; R4 and R6 are hydrogen; R3 is methyl; and the asymmetric carbon atom to which R3 is attached is in the D-configuration.
11 3Z985 HAl 8 0 a Preferred compounds with respect to the substi-tuents on the proline ring are those wherein Rl and R2 are independently selected from lower alkyl of 1 to 4 carbons, especially methyl or ethyl;
S
~ R7 ~5 ~ , -CH2 ~ 1l , or ~\
-CH2~ 0 ¦ ; and R7 is hydrogen, methyl, methoxy, ~N
methylthio, C1, Br, F, trifluoromethyl, or hydroxy; or Xl-Rl and X2-R2 join to form R~ Rg Rio I I Rlo O O
C C Rg /R9 ~ ~
R ~ I I ~ Rlo Rlo I ¦ Rlo lCH2 S~S o S ~
>~ ~<
25H2C CH2 ' or H21C ICH2 wherein Rg and 0 ~ 0 S, S
Rlo are both hydrogen or both lower alkyl of 1 to 4 carbons, especially both hydrogen or both methyl, or Rg is hydrogen and Rlo is lower alkyl of 1 to 4 carbons, .
. .
- . .
-8- HA180a especially methyi, hydroxy substituted lower alkyl of l to 4 carbons, especially hydroxymethyl, or halo substituted lower alkyl, especially trifluoromethyl.
Most preferred compounds with respect to the substituen~s on the proline ring are those wherein Xl and X2 are the same especially those wherein Xl-Rl and X2-R2 are both methoxy or both ethoxy or Xl-~l and X2-R2 join together to form H C CH H C CH , H2C - CH2 ,.
~_, S~ ~ S
/CH3 CH ~ /CH~
20 H2C - fH , H2C CH2 ~ H2l IH2 S~ S S S o, ~ o The compounds of formula I are obtained by coupling the substituted proline or pipecolic acid of the formula . , . ~ .
:
J ~3Z98S EiP.l ~ Oa _~_ (II) ,1 ,2 / C\2 (H2Cj p t ICH2) ~
HN C-COOR
H
with an acid or its chemical equivalent of the formula ~III) R4 ~3 R5-S-(CH)m C ~ COOH
wherein R5 is hydrogen, a hydrolyzably or chemically removable protecting Sroup to yield the product of the formula (IV) Rl lR2 ~ C ~ 2 R4 13 (H2C)p (CH2 q R5-S-(CH)m C - CO - N - C-COOR
.
1~32985 HA180a This reaction can be effected in the presence of a coupling agent such as dicyclohexylcarbodiimide or the like, or the acid can be activated by formation of its mixed anhydride, symmetrical anhydride, acid halide, active ester or use of Woodward reagent K, N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline or the like. For a review of the methods of acylation, see Methoden der Organishchen Chemie (Houben-~eyl), ~ol. XV, part II, page 1 et seq. (1974). Preferably, the acid halide, especially the acid chloride, of formula III is reacted with the acid of formula II.
If the proline or pipecolic acid of formula II is reacted in the ester form the resulting ester product o formula IV, i.e., R is alkyl, can be converted to the free acid, i.e., R is hydrogen, by conventional means. For example, if R is ethyl this ester protecting group can be removed by saponification.
The product of formula IV is preferably isolated and purified by crystallization, e.g., by forming the dicyclohexylamine salt and then converting the salt to the free acid form by treatment with an aqueous solution of an acid, such as potassium acid sulfate.
The product of formula IV bearing the acyl group R8-CO- can be converted to the products of formula I wherein R5 is hydrogen by conventional hydrolysis or by ammonolysis.
:
.
~13Z98S HA18Q~
The products of formula I wherein R3 and R4 are other than -(CH2)n-SH and R5 is Il l2 X~ ~X2 t \
l4 l3 (H2l)p (1~2)q -S-(CH) - C - Co - N C*COOH
I H
are obtained by directly oxidizing with iodine a product of formula I wherein R5 is hydrogen.
The esters of formula I wherein R is lower alkyl can be obtained from the carboxylic acid compounds, i.e., wherein R is hydrogen, by conventional esterification procedures, e.g., by esterification with a diazoalkane such as diazomethane, a 1-alkyl-3-p-tolyltriazene, such as l-n-butyl-3-p-tolyltriazene, or the like.
The disubstituted prolines or pipecolic acids of formula II wherein Xl-Rl and X2-R2 are the same, can be obtained by reacting an N-protected keto compound of the formula (V) o C
(H2C) p (CH2 ) q Cbz - N C*COOR
,:
.
. :,~ . , - ;
,; , . ~, . , : ;
:- . . .. ,, . :. -"- -. . -~ . ,. . ... , - ~ :i ~13Z!W5 H~laOa wherein Cbz represents carbobenzyloxy with an alcohol or thiol having the formula (VI) Rl-Xl-H
in the presence of an orthoformate or thioformate of the formula HC(X -R ) and an acid such as concentrated sulfuric acid or p-toluenesulfonic acid. This reaction can be effected in an inert organic solvent such as benzene, acetic acid, ether, cyclohexane or the like, preferably with heating, e.g., at about reflux temperature.
See Buehler et al., Survey of Organic Syntheses tWiley & Sons, 1977) Vol. 1, pages 516-519. The lS product of this reaction is the N-protected intermediate of the formula (VII) R R
/~ C~\
(H2C)p (C 2)q Cbz - N C*COOR
H
The N-protected intermediate of formula VII
can be treated with a molar equivalent of an alcohol or thiol of the formula ~132985 ~A180a ~VIII) according to the conditions described above to yield 5 the intermediate (IX) 1 R2 ~ C / 2 . / \
tH2C) p , (CH2 ) q Cbz N - C-COOR
H s lS ~y employing a molar excess of the alcohol or thiol of formula VIII one obtains the intermediate (X) R2 l2 \2 ~ 2 /c ~\
(H2C)p (CH2)q Cbz N ~*COOR
H
The N-protecting group can then be remcved by conventional procedures, for example, when Xl and X2 are both oxygen by hydrogenolysis in the presence of palladium carbon catalyst or when either or both 30 Xl and X2 are sulfur by treatment with HBr and acetic acid to yield the disubstituted compounds of formula II.
1.', . , ",-~ ~ -.. . .
~3Z985 H.~180a Similarly, the spiro compounds of formula II
(i.e~, Rl and R2 are joined together in a polymethylene chain) can be obtained by reacting the keto compound of formula V with the alcohol or thiol of the formula (XI) /
~C,\
Xl X2 H H
wherein Rg, Rlor and t are are defined above in the presence of an acid such as p-toluenesulfonic acid, to yield the intermediate (XII) ~9 ,/ 10 ~(C)t~
Xl X2 ~ C
(H2C)p (CH2 Cbz-N C-COOR
H
Alternatively, the disubstituted compound .
. ~ .
li3Z~i HA180a of formula ~II can be treated directly with a molar excess of the alcohol or thiol of formula XI
to yield the intermediate of formula XII. This procedure is particularly useful when Rg and Rlo are either or both other than hydrogen.
As described above, the N-protecting group can then be removed to yield the spiro compounds of formula II.
As an alternative procedure, the introduction of the Xl-Rl and X2-R2 groups can be effected later in the sequence. According to this modification, the protected keto compound of formuia V is treated to remove the protecting group, e.g., with hydrogen bromide, resulting in an intermediate having the formula (XIII) o Il / C
(H2C) p (CH2 ) ~E
H - N - C~COOH
H
which is then acylated with the acid, preferably the acid halide, of formula III to yield the compound of the formula ' . ~ ' ` :` ~ ' .
.
. :
: .
~13Z985 HA180a (XIV) / C
l4 l3 o (H2C)p (CH2) R' - S -(CH) - C- C - N ~ C~-COOH
The groups Xl-Rl and X2-R2 or the spiro group ~ / 10 can then be introduced at this ~ (C)t\
Xl X2 \~, ./
point by the procedures described above to yield the product of formula IV.
Reference is also made to the following publications for additional illustrative methodology for producing starting materials and intermediates:
U.S. Patents 4,046,889, 4,105,776, 4,154,935 and 4,116,962; Can. J. Biochem. & Physiol. 37, 584 (1959); J.A.C.S. 79, 189 (1957); J. Med. Chem. 21, 445 (1978); Aus. J. Chem. 20, 1493-1509 (1967~;
Buehler et al., Survey of Organic Syntheses (Wiley & Sons, 1977), Vol. 1, pages 516-519, Vol. 2 pages 461-470; Chem. Pharm. Bull., Tokyo 26, 2209 and 2217 (1978); Can. J. Chem. 47, 860 (1969);
, .
1~32985 HA180a J~ Amer. Chem. Soc., 80, 6350 (1958); Harrison et al., Compendium o~ Organic Synthetic Methods, (Wiley-Interscience, New Yor~, 1971), pages 449-456;
J. Amer. Chem. Soc., 79, 192 (1956); ~ull. Soc.
Chem., 1965(8) pages 22~53-2259; J. Org. Chem. 25, p. 521-530 (1960).
The procedures illustrated therein can be utilized as general methods for the synthesis of compounds and separation of isomers which can be utilized in the invention described in this application. Additional illustrative details are found in the examples which serve as models for the preparation of other members of the group.
The compounds of this invention form basic salts with a variety of inorganic or organic bases. The salt forming ion derived from such bases can be metal ions, e.g. ! aluminum, alkali metal ions, such as sodium or potassium, alkaline earth metal ions such as calcium or magnesium, or an amine salt ion, of which a number are known for this purpose, for example aralkylamines like, dibenzylamine, N,N-dibenzyl-ethylenediamine, lower alkylamines like methylamine, t-butylamine, procaine, lower alkylpiperidines like N-ethylpiperidine, cycloalkylamines, like cyclo-hexylamine or dicyclohexylamine, l-adamantanamine, benzathine, or salts derived from amino acids like arginine, lysine or the like. The physio-logically acceptable salts like the sodium or potassium salts can be used medicinally as described .
1~32985 HA180a - below and are preferred. These and other salts which are not necessarily physiologically accepta~le are useful in isolating or purifying a product accepta-ble for the purposes described below, as illustrated S with the dicyclohexylamine salt in the examples.
The salts are produced by reacting the acid form of the compound with a equivalent of the base supplying the desired basic ion in a medium in which the sait precipitates or in aqueous medium and then lyophilizing.
The free acid form can be obtained from the salt by conventional neutralization techniques, e.g., with potassium bisulfate, hydrochloric acid, etc.
The compound of formula I wherein R5 is g ~ R8-C- ~ or the disulfide type substituent, especially wherein R5 is hydrogen, are useful as hypotensive agents. They inhibit the conversion of the decapeptide angiotensin I to angiotensin II and, therefore, are useful in relieving angiotensin related hypertension. The actiQn of the enzyme renin on angiotensinogen, a pseudo-globulin in blood plasma, produces angiotensin I.
Angiotensin I is converted by angiotensin converting enzyme (ACE) to angiotensin II. The latter is an active pressor substance which has been implicated as the causative agent in various forms of hypertension in various mammalian species, e.g., rats and dogs.
The compounds of this invention intervene in the angiotensinogen ~ (renin) ~ angiotensin I ~ (ACE) angiotensin II sequence by inhibiting angiotensin ' ' ' , , .
, ' . ~ ~
~132985 ~A180a converting enzyme and reducing or eliminating t.ie formation of the pressor substance angiotensin II.
Thus by the administration of a composition containing one, or a combination of compounds of formula I
S angiotensin dependent hypertension in the species of mammal suffering therefrom is alleviated.
single dose, or preferably two to four divided daily doses, provided on a basis of about 0.1 to 100 mg.
per kilogram of body weight per day, preferabiy about 1 to 15 mg. per kilogram of body weight per day is appropriate to reduce blood pressure. The substance is preferably administered orally, but parenteral routes such as the subcutaneous, intramuscular, intravenous or intraperitoneal routes can also be employed.
The compounds of this invention can also be formulated in combination with a diuretic for the treatment of hypertension. A combination product comprising a compound of this invention and a diuretic can be administered in an effective amount which comprises (for a 70 kg. mammal) a total daily dosage of about 30 to 600 mg., preferably about 30 to 300 mg., of a compound of this invention, and about 15 to 300 mg., preferably about 15 to 200 mg.
of the diuretic, to a mammalian species in need thereof. Exemplary of the diuretics contemplated for use in combination with a compound of this invention are the thiazide diuretics, e.g., chlor-thiazide, hydrochlorthiazide, flumethiazide, hydro-glumethiazide, benzdroflumethiazide, methchlothiazide, : ~ .
.:, -~ .
- :-.
~.Al~Oa --~u--trichlormethiazide, polythiazide or benzthiazide, as well as ethacrynic acid, ticrynafen, chlorthal-idone, furosemide, musolimine, bumetanide, triam-terene, amiloride and spironolactone, and salts of such compounds.
The compounds of formula I can be formulated for use in the reduction of blood pressure in compo-sitions such as tablets, capsules or elixirs for oral administration or in sterile solutions or suspensions for parenteral administration. About 10 to 500 mg.
of a compound or mixture of compounds of formula I
is compounded with a physiologically acceptable vehicle, carrier, excipient, binder, preservative, stabilizer, flavor, etc., in a unit dosage form as called for by accepted pharmaceutical practice.
The amount of active substance in these compositions or preparations is such that a suitable dosage in the range indicated is obtained.
Illustrative process details are set forth in the following examples for the various reactions.
These examples are preferred embodiments and also serve as models for the prepar~tion of other compounds of this invention. The temperatures are given in degrees on the centrigrade scaie.
- . .
. . .
`- 1132985 HA180a Example 1 ~7(S),8S]-7-(Acetylthio)-2-methyl-1-oxopropyl]-1, 4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid a) N-Carbobenzyloxy-4-hydroxy~L-proline 26.5 g. (0.20 mole) of 4-hydroxy-L-proline and 32.8 ml. (0.23 mole) of benzyl chloroformate are reacted in 200 ml. of water and 100 ml. of acetone in the presence of 20 g. (0.02 mole) of potassium bicarbonate and 69.2 g. (0.50 mole) of potassium carbonate and worked up with 90 ml. of concentrated hydrochloric acid as described in Can.
J. Biochem. & Physiol. 37, 584 (1959) to obtain N-carbobenzyloxy-4-hydroxy-L-proline. This product is reacted with cyclohexylamine to form the cyclohexylamine salt yield 69 g. , m.p. 193-195. The salt (34 g.) is neutralized with N-hydrochloric acid to obtain 27 g- of free acid as a colorless glass ~a]D ~70~ (c, 1~ in chloroform).
b) N-carbobenzyloxy-4-keto-L-proline 21.5 g. (0.81 mole) of N-carbobenzyloxy-4-hydroxy-L-proline is oxidized in 1.2 liters of acetone with 83 ml. of 8N chromic acid in sulfuric acid as described in J.A.C.S. 79, 189 (1957). In order to facilitate the subsequent filtration of chromium salts, 30 g. of Celite (diatomaceous earth) is added to the acetone solution before introduction of the oxidizing agent. An air stirrer is employed. The reaction mixture is filtered and the acetone filtrate is concentrated to approximately 300 ml. before diluting with 1 liter of chloroform. The solution is ; washed with 300 ml. of saturated sodium chloride (four times~, dried (Mg5O4), filtered and the solvent evaporated to give :
, , ' ':
~132985 H~180a N-carbobenzyloxy-4-keto-L-proline(22.8 g.) which is crystallized from ether (50 ml.)-hexane (150 ml.) to obtain 17.2 g. (81%) of product, m.p. 99-101, ~a]26 +17 (c, 1~ in chloroform).
c) N-Carbobenzylox~I-4,4-ethylenedioxy-L-proline A stirred mixture of 12.8 g. (0.049 mole) of N-carbobenzyloxy-4-keto-L-proline, 53 ml. (0.095 mole) of ethylene glycol, and 0.35 g. of p-toluene-sulfonic acid H2O in 1.31 1. of benzene is heated and the resulting solution is refluxed for 7 hours (water formed is collected in a Dean-Stark apparatus).
After standing overnight at room temperature, the lower glycol layer is separated and the benzene solution is washed with 150 ml. of saturated sodium chloride, dried (MgSO4), and the solvent evaporated to give 14.6 g. of N-carbobenzyloxy-4,4-ethylenedioxy-L-proline as a syrupy residue. The latter is dissolved in 60 ml. of ethanol, filtered, treated with 5 g.
of cyclohexylamine, and diluted with ether. On seeding and rubbing, the crystalline cyclohexylamine salt separates; weight after cooling overnight, 9.0 g., m.p. 179-180 (s. 173). The material is recrystallized from acetonitrile, m.p. 182-184 (s. 179 )~ [a]D -21 (c, 1% in EtOH).
The cyclohexylamine salt (8.4 g.) is suspended in 40 ml. of ethyl acetate, stirred, cooled, and treated with 40 ml. of lN hydrochloric acid. The layers are separated, the aqueous phase extracted with additional ethyl acetate ( 3 x 40 ml.), the combined organic layers are dried (MgSO4), and the solvent .
:, : .
~ , 113Z985 HA180a evaporated, finally at 0.2 mm. The syrupy residue which begins to Crfstallize is rubbed under ether and the ether evaporated to give 6.4 g. ~42~) of nearly colorless N-carbobenzyloxy-4,4-ethylene-S dioxy-L-proline, m.p. 101-103 (s. 98), la~26 _34 (c, 1~ in CHC13).
d) 4,4-Ethvlenedioxv-L-~roline A solution o~ 3.2 g. (o.0104 mole) of N-carbobenzyloxy-4,4-ethylenedioxy-L-proline in 100 ml.
of methanol-water (2:1) is treated with 1 g. of 5%
palladium-carbon and shaken on the Parr hydrogenator for 6 hours. The catalyst is filtered off under nitrogen, washed with methanol, and the combined filtrates evaporated, finally at 0.1 - 0.2 mm, to give 1.7 g. (94%) of colorless solid, 4,4-ethylene-dioxy-L-proline; m.p. 245-247 (dec.); [a]26 -32 (c,0.5~ in 1:1 MeOH-H2O).
e) [? (s), 8S]-7-[3-(Acetylthio)-2-methyl-1-o:~opropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid A stirred solution of 3.2 g. of 4,4-ethylene-dioxy-L-proline (0.0185 mole) in 50 ml. of water is cooled to 5 and treated portionwise with solid sodium carbonate to pH 8.5. Then while continuing stirring and cooling, a solution of 3.7 g. (0.020 mol.) of D-3-acetylthio-2-methylpropanoyl chloride in 5 ml.
of ether is added portionwise while maintaining the pH at 8.5 with 25% sodium carbonate solution (about 14 ml.). After 1 1~4 :~ours, the solution istreated with 50 ml. of ethyl acetate,stirred, cooled,acidified carefully with hydrochloric acid (1:1) to pH 2.0, :, .:, ' , . :
.
,, :
H~180a saturated with sodium chloride and the layers are separated. The aqueous phase is extracted with additional ethyl acet~te (3 x 50 ml.), the combined organic layers are dried (MgSO4) and the solvent evaporated finally at 0.2 mm. The solid residue is rubbed under ether and the evaporation repeated to obtain 5.9 g. (100%) of [7(S), 8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid; m.p. 108-111.
The product is converted to the dicyclohexyl-amine salt with 3.4 g. of dicyclohexylamine in 70 ml.
of ethyl acetate. On seeding and rubbing, the crystalline salt precipitates and is recrystallized from 95 ml. of acetonitrile; yield 6.7 g., m.p.
187-189 (s. 184), [al25 -59 (c, 1~ in EtOH).
The dicyclohexylamine salt is converted to the free acid by suspending it in ethyl acetate and treating wi~h 75 ml.of 10% potassium bisulfate and stirring until two layers are obtained. After separating, the aqueous phase is extracted with ethyl acetate ( 4 x 75 ml.), the organic layers are combined, dried (MgSO4) and the solvent is evaporated to give 4.1 g. of colorless [7(S),8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, m.p. 120-122 (s. 117) [a]25 -118 (c, 1% in EtOH).
Example 2 [7(S)-8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid Argon is passed through a cold solution of . .
- -- . :
113Z985 HA180a 8.5 ml. of concentrated ammonium hydroxide in 20 ml.
of water. 4.0 g. (0.013 mole) of [7(S),85]-7-[3-tacetylthio)-2-methyl-1-oxopropyl]-1,4-diOxO-7-azaspiro-~4.4]nonane-8-carboxylic acid from Example le are then added and the mixture is stirred in an ice bath for a few minutes and then a room temperature under argon for two hours. The solution is treated with 30 ml. of ethyl acetate,cooled, stirred, and acidified with 16 ml. of of hydro-chloric acid (1:1). The layers are separated, the aqueous phase is extracted with additional 30 ml.
of ethyl acetate (twice),the ethyl acetate extracts are combined, dried (MgSO4) and the solvent evaporated to give 17(s),8s]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid as a solid residue. The product is rubbed under ether and the evaporation is repeated.
The product is then triturated with 30 ml. of hexane, cooled for one hour, filtered under argon and dried in vacuo to give 2.7 g. of colorless solid ~7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, m.p. 131-133 (s. 125), ta]25 -66 (c, 1~ in Et~
Example 3 (S)-1-[(3-Acetylthio)-2-methv]-1-oxopropyll-4,4-dimethoxy-L-proline a) N-Carbobenzyloxy-4,4-dimethoxy-L-proline, methyl ester A stirred solution of 7.8 g. (0.03 mole) of N-carbobenzyloxy-4-keto-L-proline from Example 1 in , '" ' . :
, : .
~ .
.~ . . . . . . . .
, .; :
HA180a 60 ml. of methanol is treated with 96 ml. of tri-methyl orthofo~mate, followed by 0.6 ml. of concentrated sulfuric acid and allowed to stand overnight at room temperature.
The pale yellow solution is stirred, treated with 1.5 g. of potassium carbonate, followed by 30 ml. of water and the bul~ of the solvent is removed on a rotary evaporator to give a syrupy residue which is shaken with 30 ml. of water and 30 ml. of chloroform. After separating the layers the a~ueous phase is extracted with additional chloroform (3 x 30 ml.) and the combined organic layers are washed with 45 ml. of saturated sodium chloride solution and dried (MgSO4). Evaporation of the solvent yields 8.4 g. (88~) of N-carbobenzyl-oxy-4,4-dimethoxy-L-proline, methyl ester.
b) N-Carbobenzyloxy-4,4-dimethoxy-L-proline The ester (8.4 g., 0.026 mole) from part a is dissolved in 80 ml. of methanol, treated dropwise at -1 to 4 with 18 ml. (0.036 mole) of 2N sodium hydroxide kept at 0 for one hour, and at room temperature overnight. After removing about one half of the solvent on a rotary evaporator, the solution is diluted with 150 ml. of water, washed with 100 ml.
of ether (wash discarded), acidified while cooling with 63 ml. of 1:1 hydrochloric acid to pH 2, and extracted with ethyl acetate (4 x 750 ml.). The combined extracts are washed with 50 ml. of saturated sodium chloride solution, dried (MgS04), and the solvent evpaorated to give 8.0 g. of a pale yellow ~ "
.
., . , : . . :~
,.
.
: : "; . ~
:~ : ~ : . ~ . .
1~3Z985 HA18Oa viscous oil. The oil is dissolved in 35 ml. ethancl, treated with 3.0 g. of cyclohexylamine in 10 ml. of ethanol and diluted to 500 ml. with ether. On seeding and rubbing, the crystalline N-carbobenzyloxy-4,4-dimethoxy-L-proline cyclohexylamine salt separated;
weight after cooling overnight, 7.0 g., m.p. 157-159 (s, 151) [~]D ~34 (c, 1~ in EtOH). This material is recrystallized from 100 ml. of acetonitrile to give the salt as a colorless solid, m.p. 158-160 (s, 154) [a]26 _33 (c, 1% in EtOH).
The N-carbobenzyloxy-4,4-dimethoxy-L-proline cyclohexylamine salt is suspended in 40 ml. of ethyl acetate, stirred and treated with 25 ml. cf lN
hydrochloric acid. When two clear layers are obtained lS they are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 40 ml.), the combined organic layers are dried tMgSO4), and the solvent evaporated, finally at 0.2 mm and 40 to yield 7.2 g. (70%) of N-carbobenzyloxy-4,4-dimethoxy-L-proline as a pale yellow viscous syrup.
c) 4,4-Dimethoxy-L-proline .
A solution of N-carbobenzyloxy-4,4-dimethoxy-L-proline (72 g., 0.022 mole) in 210 ml. of methanol-water (2:1) is treated with 2.3 g. of 5% palladium-carbon and shaken on a Parr hydrogenator for 6 hours.The catalyst is filtered off under nitrogen, washed with methanol, and the combined filtrates are evaporated, finally at 0.1 - 0.2 mm., to give a partly crystalline residue. This residue is taken up in 200 ml. of methanol and the evaporation repeated.
,~.
. " .` -:
:. . .
113Z98S HA18Oa When the solid is rubbed under ether (evaporation again repeated) there is obtained 3.6 g. (95%) of nearly colorless 4,4-dimethoxy-L-proline, m.p. 192-19~
(dec.) ; t~]D -47 (c, 1~ in MeOH).
A sample crystallized from methanol-ether is colorless and melts at i97-198 (dec.);[]D -49 (c, 1~ in MeOH).
d) (S)-1-[3-(Acetylthio)-2-methyl-1-oxoprop~1j-4,4-dimethoxy-L-proline A stirred solution of 3.3 g. (0.019 mole) of 4,4-dimethoxy-L-proline in 50 ml. of water is cooled to 5 and brought to pH ~.5 by the addition of 25~
sodium carbonate solution (w/v). Then while continuing stirring and cooling, a solution of 3.8 g. (0.021 mole) of D-3-acetylthio-2-methylpropanoyl chloride in 5 ml.
of ether is added portionwise while maintaining the pH at 7.5 - 8.5 by dropwise addition of 25~ sodium carbonate solution. When the pH has stabilized at 8.2 - 8.4 (after about 15 minutes), stirring and cooling is continued for a total of one hour. The solution is then washed with 50 ml. of ethyl acetate twash discarded, layered over with 50 ml. of ethyl acetate, cooled, stirred, acidified carefully with 1:1 hydrochloric acid to pH 2.0, saturated with sodium chloride, and the layers separated. The aqueous phase is extracted with additional ethyl acetate ( 3 x 50 ml.), the combined organic layers are dried (MgSO4), and the solvent evaporated, finally at 0.2 mm, to give 6.7 g. of syrupy product. This syrup is treated in 70 ml. of ethyl acetate with 3.9 g. of dicyclohexylamine to give 6.5 g.
.
, , .-~329~5 ~180a of colorless (S)-1-[3-(acetylthio)-2-methyl-1-oxo-propyl]-4,4-dimethoxy-L-proline dicyclohexylamine salt in crops (3.1 g. and 3.4 g.), m.p. 158-160 (s, 145 ). [a]D -71 (c, 1% in EtOH).
Following recrystallization from 20 ml. of hot ethyl acetate-60 ml. of hexane, the colorless solid salt weighs 6.0 g., m.p. 158-166 (s, 155), []D -69 (c, 1% in EtOH~.
The dicyclohexylamine salt is c~nverted to the free acid by suspending 5.0 g. in 50 ml. of ethyl acetate, cooling and treating with 60 ml. of 10%
potassium bisulfate solution to give 2 clear layers.
After separating, the aqueous phase is extracted with ethyl acetate (3 x 50 ml.), the combined organic layers are dried (MgSO4), and the solvent evaporated, finally at 0.1 - 0.2 mm. and 45 to give 4.1 g.
(69%) of (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline as a viscous, almost glass-like material la]D -112 (c, 1% in EtOH).
Example 4 (S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline Argon is passed through a cold solution of 8.5 ml. of concentrated ammonium hydroxide in 20 ml. of water for 0.25 hour. The latter is then added while cooling and under a blanket of argon to 4.1 g.
(0.013 mole) of (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline and the mixture is swirled in an icebath until a pale yellow solution is obtained (about 15 minutes). Stirring under J~ -, ,, .
,,: ,: .
113Z985 HA18Oa argon is continued at room temperature for an additional 2 hours, then the solution is extracted with 30 ml. of ethyl acetate (this and subsequent operations are carried out as much as possible under an argon atmosphere~. The aqueous layer is cooled, stirred, layered over with 30 ml. of ethyl acetate, and acidified portionwi~e with approximat~ly 16 ml.
of 1:1 hydrochloric acid. The layers are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 30 ml.), the combined ethyl acetate layers are dried (~gSO4), and the solvent evaporated to gi~e 3.5 g. (100%) of (S)-1-(3-mercapto-2-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline as a colorless, viscous syrup, []D -72 (c, 1% in EtOH).
The latter (3.4 g.) is triturated with 20 ml.
of ethyl acetate, rubbed, diluted with 30 ml. of hexane, and cooled to give a colorless solid, weight 2.6 g., m.p. 108-110 , ~a]D ~77 (c,l~ in EtOH).
Example 5 (S)-1-[3-(~cetylthio)-2-methyl-1-oxopro~yll-4,4-diethoxy-L-proline a) N-Carbobenzyloxy-4,4-diethoxy-L-proline, ethYl ester Following the procedure of Example 3 (a) but substituting triethyl orthoformate for the tri-methyl orthoformate and ethanol for the methanol one obtains 10.8 g. of N-carbobenzyloxy-4,4-diethoxy-L-proline, ethyl ester as a yellow oil.
~,' , , : ,-. . , , :, : ' ' ~
- , "
:., -:.
:: .
. ~ .. .
113Z985 HA180a b) N Carbobenz lox -4 4-diethox -L- roline ~ Y Y , ~ P
The crude ester from part (a) (10.8 g., 0.03 mole) is saponified with 70 ml. of lN sodium hydroxide according to the procedure of Example 4 (b), 30 ml.
of ethanol is added in 10 ml. portions to obtain a solution, to give 10.5 g. of a yellow viscous oil.
This oil is dissolved in 100 ml. of ether and treated with cyclohexylamine (3.0 g.). On seeding and rubbing, 8.3 g. of the crystalline N-carbobenzyloxy-4,4-diethoxy-L-proline cyclohexylamine salt separates; m.p.
123-125 (s. 114 ) ~]D -32 (c, 1% in ethanol).
This material is recrystallized from 20 ml. of acetonitrile to give 7.0 g. of the salt as a colorless solid: m.p. 125-128 (s. 115) [al26 -31 (c, 1% in ethanol).
The N-carbobenzyloxy-4,4-diethoxy-L-proline cyclohexylamine salt is suspended in 40 ml. of ethyl acetate, stirred and treated with 20 ml. of 1 N
hydrochloric acid. The layers are separated and the aqueous phase is extracted with additional ethyl acetate (3 x 40 ml.), the organic layers are combined, dried (MgSO4), and the solvent evaporated to give 5.6 g. (56~) of N-carbobenzyloxy-4,4-diethoxy-L-proline as a light yellow oil.
c) 4,4-Diethoxy-L-proline A solution of the N-carbobenzyloxy-4,4-diethoxy-L-proline (5.6 g., 0.017 mole) in 180 ml. of 2:1 ethanol-water is treated with 2 g. of a 5~ palladium carbon catalyst and shaken under 3 atmospheres of hydrogen for six hours. The crude partly solid : .
" ' . . .
- :
.
1~3Z985 HA18Oa product is rubbed first under ethanol, then ether, and the evaporation repeated each time to give 3 g.
(91%) of nearly colorless solid 4,4-diethoxy-~-proline; m.p. 172-174 (dec.); preceded by gradual darkening and sintering ~a]D6 -40 (c, 1~ in methanol).
Anal. Calc'd. for CgH17N04 : 0.25 H20:
C, 52.03; H, 8.49; N, 6.74 Found: C, 52.22; H, 8.59; N, 6.69.
d) (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-diethoxy-L-proline The 4,4-diethoxy-L-proline (2.9 g., 0.014 mole) from part (c) and 3 g. ~0.017 mole) of D-3-acetylthio-2-methylpropionyl chloride dissolved in 3.5 ml. of ether are reacted in 35 ml. of water in the presence of sodium carbonate according to the procedure of Example 3 (d) to yield 5.4 5. of pale yellow viscous oil. This oily product is treated in 40 ml. of ethyl acetate with 2.6 g. of dicyclo-hexylamine and diluted with 60 ml. of hexane toyield in two crops 4.9 g. of (S)-1-~(3-acetylthio)-2-methyl-l-oxopropyl]-4,4-diethoxy-L-proline dicyclo-hexylamine salt; m.p. 135-138 (s. 132). Following recrystallization from 15 ml. of hot ethyl acetate-45 ml. of hexane, the colorless solid salt weighs4.2 g.: m.p. 138-140 (s. 135), []26 -63 (c, 1~ in ethanol).
Anal. Calc'd. for C15H25N06S C12 23 C, 61.33; H, 9.15; N, 5.30; S, 6.06 30 Pound: C, 61.48; H, 9.55; N, 5.25; S, 5.91.
... ..
:- ~
, , . : . :
-~13Z985 HA18Oa The dicyclohexylamine salt is converted to the free acid by suspendin~ 4.2 g. in 40 ml. of ethyl acetate, cooling and treating with 40 ml. of 10 potassium bisulfate solution to give two layers.
After separa~ing, the aqueous phase is extracted with ethyl acetate (3 x 50 ml.), the combined organic layers are dried (MgS04), and the solvent evaporated to give 3.0 g. (61%) of (S)-1-[3-(acetylthio)-2-methyl-l-oxopropyll-4~4-diethoxy-L-proline as a pale yellow viscous syrup.
Example 6 (S)-4,4-Diethoxy-1-(3-Mercapto-2-methyl-1-oxopropyl)-L-proline Argon is passed through a cold solution of 5.5 ml. of concentrated ammonium hydroxide in 13 ml.
of water for 0.25 hour. The latter is then added while cooling under a blank~t of argon to 3.0 g.
~0.0086 mole) of (S)-1-[3-~acetylthio)-2-methyl-l-oxopropyl]-4,4-diethoxy-L-proline and the mixture is worked up as described in Example 4 to yield 2.4 g. (92~) of (S)-4,4- diethoxy-1-(3-mercapto-2-methyl-1-oxopropyl)-L-proline as a nearly colorless viscous syrup ~al26 -64, (c, 1% in ethanol).
Anal. Calc d. for C13 23 5 2 C, 50.38; H, 7.64; N, 4.52; S, 10.35 Found: C, 50.68; H, 7.96; N, 4.78; S, 10.07.
Example 7 [2(S),3S]-2-[3-(Acetylthio)-2-methyl-1-oxopropyl]-6,10-dioxo-2-azaspiro[4.5]decane-3-carboxylic acid ~
a) N-Carbobenzy oxy-4,4-trimethylenedioxy-L-proline ~; ~
, , , - : :
: .
~A18Oa _3a_ Interaction of 8.2 g. (0.031 mole) of N-carbobenzyloxy-4-keto-L-proline and 45 ml. (0.62 mole) of 1,3-propanediol in 450 ml. of benzene in the presence of 500 mg. of p-toluenesulfonic acid gi~es 12.3 g. of crude viscous ester nroduct.
This product is saponified with 70 ml. of lN
sodium hydroxide to give 10.6 g. of crude N-carbo-benzyloxy-4,4-trimethylenedioxy-L-proline as a yellow oil. The latter is dissolved in 40 ml.
of ethanol - 400 ml. ether and treated with
When Rl and R2 are joined together in a polymethylene chain of 2 or 3 carbons, these cyclic ketal and thioketals can be represented as follows:
Rlo Rg 10~ 9 10 ~ Rg ~(C)t~\ ~(C)t~ /(C)t \~ . ~.~ \~
wherein t is 2 or 3 and Rg and Rlo are both hydrogen, both lower alkyl, or one is hydrogen and the other is lower alkyl, halo substituted lower alkyl, hydroxy substituted lower alkyl, ( 2 n ~ R7 ~(CH2)n~ ~ , or (CH2) `X3 N
Preferably, only one carbon of the polymethylene chain will be substituted.
R7 is hydrogen, lower alkyl of 1 to 4 carbons, espe-cially methyl, lower alkoxy of 1 to 4 carbons, especially methoxy, lcwer alkylthio of 1 to 4 car~ons, especially methylthio, chloro, bramo, fluoro, trifluor~methyl, or hydroxy.
R5 is hydrogen, a hydrolyzably removable protect-ing group, a chemically removable protecting group, or when R3 and R~ are other than -(CH2)n-SH a sulfide of the formula .13Z9t35 _3_ HAl80a Il l2 ~ C /
,~ \
S (H2C)p ~CH2)q l~ l3 ~
-~-(CH)m-C- C N C-COOR
m is zero, one, or two.
n is one, two or three.
p and q are each one or two provided that both are not two.
The asterisk in the above formula indicates a center of asymmetry in the ring. In the case of proline, i.e., p and q are both one, this center is in the L-configuration. In the case of pipecolic acid, i.e., one of p and q is two, this center is in the D, L or L-configuration.
Asymmetric centers can also be present in the mercaptoacyl sidechain depending upon the definition of R3, R4 and R6. Another assymmetric center may also be present in the ring when ~-Rl and X2-R2 are different. The products can accordingly exist in stereoisomeric forms or as racemic mLxtures thereof. All of these æe within the scope of the invention. The synthesis described below can utilize the racemate or one of the enantiomers as starting materials. ~hen the racemic starting material is used in the synthesis procedure, the stereoisomers obtained in final product can be separated by conventional chromatographic or fractional crystallization methods.
: . .
:. ' :: -~s _4_ HA180a Preferably, if there is an asymmetric center in the mercaptoacyl sidechain, it is in the D-confi~uration.
s This invention in its broadest aspect relates to the mercaptoacyl derivatives of proline and pipe-colic acid having formula I above and to salts thereof, to compositions containing such compounds and to the method for using such compounds as anti-hypertensive agents. This invention is also directed to certain novel intermediates useful in the preparation of compounds of formula I.
The term lower alkyl as used in defining the y , R1, R2, R3, R4, and R6 are straight or branched chain hydrocarbon radicals having up to seven carbons, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, iso-pentyl, etc. The preferred lower alkyl groups are up to four carbons with methyl and ethyl being most preferred. Similarly, the terms lower alkoxy and lower alkylthio refer to such lower alkyl groups attached to an oxygen or sulfur.
The term cycloalkyl refers to saturated rings of 3 to 7 carbon atoms with cyclohexyl being most preferred.
The term halo substituted lower alkyl refers to such lower alkyl groups described above in which one or more hydrogens have been replaced by chloro, bromo or fluoro groups such as trifluoromethyl, pentafluoroethyl, 2,2,2-trichloroethyl, chloromethyl, :. ~
. . . . . . .
, .......... ..
.: :
.
, .
,. .
\
1132~85 HA180a bromomethyl, etc.
The term hydroxy substituted lower alkyl refers to such lower alkyl groups described above in which one hydrogen has been replaced by a hydroxy group such as hydroxymethyl, 2-hydroxyethyl, etc.
The term lower alkenyl as used in defining the symbols Rl and R2 are mono-saturated straight or branched chain hydrocarbon groups of from 2 to 7 carbons such as ethenyl, propenyl, isopropenyl, butenyl, and the like. The lower alkynyl groups are straight or branched chain hydrocarbon groups of from 2 to 7 carbons having one triple bond, e.g., propargyl. The preferred lower alkenyl groups are from 2 to 5 carbons and the preferred lower alkynyl groups are from 2 to 4 carbon atoms.
The term hydrolyzably removable protecting group employed in defining R5 refers to a group that can be removed by conventional hydrolysis or o ammonolysis. Acyl groups of the formula are suitable for this purpose wherein R8 can be lower alkyl of 1 to 7 carbons, lower alkyl substituted with one or more chloro, bromo or fluoro groups, -(CH2)r-cycloalkyl, an aryl group such as ( 2)r ~ ; a hetero group such as -(C~2) ~ , or -(CH2)r ~ wherein r is zero, one, two or three, and R7 and X3 are as defined above.
:~
.,. --':. ' ' ~ . i ,, ~:, ", - ,, .".
. - ~. :. .
1~3Z985 ~ 80a Preferred groups are the lower alkanoyl groups hav-ng up to four carbons, especially acetyl, and benzoyl.
The term chemically removable protecting group employed in defining R5 refers to groups such as p-methoxybenzyl, p-methoxybenzyloxycarbonyl, trityl, t-butoxycarbonyl, etc. These groups can be removed after the completion of the acylation reaction by various means depending upon the definition of Xl-Rl and X2-R2 such as by treatment with trifluoro-acetic acid and anisole, sodium and liquidammonia, or mercuric trifluoroacetate. Preferred compounds of formula I are the L-proline containing derivative, i.e., p and q are both one, and R is hydrogen.
With respect to the mercaptoacyl sidechain, preferred as final products are those compounds wherein R5 is hydrogen; m is zero or one; R4 is hydro-gen; and R3 and R6 are both lower alkyl of 1 to 4 carbons, especially both methyl, or R6 is hydrogen and R3 is hydrogen, lower alkyl of 1 to 4 carbons, especially methyl, trifluoromethyl, methylthio, or mercaptomethyl. .~lso preferred as both intermediates and final products are the above sidechains wherein R5 is lower alkanoyl or 1 to 4 carbons, especially acetyl, or benzoyl.
Especially preferred as final products are the compounds of formula I having the mercaptoacyl sidechain wherein R5 is hydrogen; m is one; R4 and R6 are hydrogen; R3 is methyl; and the asymmetric carbon atom to which R3 is attached is in the D-configuration.
11 3Z985 HAl 8 0 a Preferred compounds with respect to the substi-tuents on the proline ring are those wherein Rl and R2 are independently selected from lower alkyl of 1 to 4 carbons, especially methyl or ethyl;
S
~ R7 ~5 ~ , -CH2 ~ 1l , or ~\
-CH2~ 0 ¦ ; and R7 is hydrogen, methyl, methoxy, ~N
methylthio, C1, Br, F, trifluoromethyl, or hydroxy; or Xl-Rl and X2-R2 join to form R~ Rg Rio I I Rlo O O
C C Rg /R9 ~ ~
R ~ I I ~ Rlo Rlo I ¦ Rlo lCH2 S~S o S ~
>~ ~<
25H2C CH2 ' or H21C ICH2 wherein Rg and 0 ~ 0 S, S
Rlo are both hydrogen or both lower alkyl of 1 to 4 carbons, especially both hydrogen or both methyl, or Rg is hydrogen and Rlo is lower alkyl of 1 to 4 carbons, .
. .
- . .
-8- HA180a especially methyi, hydroxy substituted lower alkyl of l to 4 carbons, especially hydroxymethyl, or halo substituted lower alkyl, especially trifluoromethyl.
Most preferred compounds with respect to the substituen~s on the proline ring are those wherein Xl and X2 are the same especially those wherein Xl-Rl and X2-R2 are both methoxy or both ethoxy or Xl-~l and X2-R2 join together to form H C CH H C CH , H2C - CH2 ,.
~_, S~ ~ S
/CH3 CH ~ /CH~
20 H2C - fH , H2C CH2 ~ H2l IH2 S~ S S S o, ~ o The compounds of formula I are obtained by coupling the substituted proline or pipecolic acid of the formula . , . ~ .
:
J ~3Z98S EiP.l ~ Oa _~_ (II) ,1 ,2 / C\2 (H2Cj p t ICH2) ~
HN C-COOR
H
with an acid or its chemical equivalent of the formula ~III) R4 ~3 R5-S-(CH)m C ~ COOH
wherein R5 is hydrogen, a hydrolyzably or chemically removable protecting Sroup to yield the product of the formula (IV) Rl lR2 ~ C ~ 2 R4 13 (H2C)p (CH2 q R5-S-(CH)m C - CO - N - C-COOR
.
1~32985 HA180a This reaction can be effected in the presence of a coupling agent such as dicyclohexylcarbodiimide or the like, or the acid can be activated by formation of its mixed anhydride, symmetrical anhydride, acid halide, active ester or use of Woodward reagent K, N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline or the like. For a review of the methods of acylation, see Methoden der Organishchen Chemie (Houben-~eyl), ~ol. XV, part II, page 1 et seq. (1974). Preferably, the acid halide, especially the acid chloride, of formula III is reacted with the acid of formula II.
If the proline or pipecolic acid of formula II is reacted in the ester form the resulting ester product o formula IV, i.e., R is alkyl, can be converted to the free acid, i.e., R is hydrogen, by conventional means. For example, if R is ethyl this ester protecting group can be removed by saponification.
The product of formula IV is preferably isolated and purified by crystallization, e.g., by forming the dicyclohexylamine salt and then converting the salt to the free acid form by treatment with an aqueous solution of an acid, such as potassium acid sulfate.
The product of formula IV bearing the acyl group R8-CO- can be converted to the products of formula I wherein R5 is hydrogen by conventional hydrolysis or by ammonolysis.
:
.
~13Z98S HA18Q~
The products of formula I wherein R3 and R4 are other than -(CH2)n-SH and R5 is Il l2 X~ ~X2 t \
l4 l3 (H2l)p (1~2)q -S-(CH) - C - Co - N C*COOH
I H
are obtained by directly oxidizing with iodine a product of formula I wherein R5 is hydrogen.
The esters of formula I wherein R is lower alkyl can be obtained from the carboxylic acid compounds, i.e., wherein R is hydrogen, by conventional esterification procedures, e.g., by esterification with a diazoalkane such as diazomethane, a 1-alkyl-3-p-tolyltriazene, such as l-n-butyl-3-p-tolyltriazene, or the like.
The disubstituted prolines or pipecolic acids of formula II wherein Xl-Rl and X2-R2 are the same, can be obtained by reacting an N-protected keto compound of the formula (V) o C
(H2C) p (CH2 ) q Cbz - N C*COOR
,:
.
. :,~ . , - ;
,; , . ~, . , : ;
:- . . .. ,, . :. -"- -. . -~ . ,. . ... , - ~ :i ~13Z!W5 H~laOa wherein Cbz represents carbobenzyloxy with an alcohol or thiol having the formula (VI) Rl-Xl-H
in the presence of an orthoformate or thioformate of the formula HC(X -R ) and an acid such as concentrated sulfuric acid or p-toluenesulfonic acid. This reaction can be effected in an inert organic solvent such as benzene, acetic acid, ether, cyclohexane or the like, preferably with heating, e.g., at about reflux temperature.
See Buehler et al., Survey of Organic Syntheses tWiley & Sons, 1977) Vol. 1, pages 516-519. The lS product of this reaction is the N-protected intermediate of the formula (VII) R R
/~ C~\
(H2C)p (C 2)q Cbz - N C*COOR
H
The N-protected intermediate of formula VII
can be treated with a molar equivalent of an alcohol or thiol of the formula ~132985 ~A180a ~VIII) according to the conditions described above to yield 5 the intermediate (IX) 1 R2 ~ C / 2 . / \
tH2C) p , (CH2 ) q Cbz N - C-COOR
H s lS ~y employing a molar excess of the alcohol or thiol of formula VIII one obtains the intermediate (X) R2 l2 \2 ~ 2 /c ~\
(H2C)p (CH2)q Cbz N ~*COOR
H
The N-protecting group can then be remcved by conventional procedures, for example, when Xl and X2 are both oxygen by hydrogenolysis in the presence of palladium carbon catalyst or when either or both 30 Xl and X2 are sulfur by treatment with HBr and acetic acid to yield the disubstituted compounds of formula II.
1.', . , ",-~ ~ -.. . .
~3Z985 H.~180a Similarly, the spiro compounds of formula II
(i.e~, Rl and R2 are joined together in a polymethylene chain) can be obtained by reacting the keto compound of formula V with the alcohol or thiol of the formula (XI) /
~C,\
Xl X2 H H
wherein Rg, Rlor and t are are defined above in the presence of an acid such as p-toluenesulfonic acid, to yield the intermediate (XII) ~9 ,/ 10 ~(C)t~
Xl X2 ~ C
(H2C)p (CH2 Cbz-N C-COOR
H
Alternatively, the disubstituted compound .
. ~ .
li3Z~i HA180a of formula ~II can be treated directly with a molar excess of the alcohol or thiol of formula XI
to yield the intermediate of formula XII. This procedure is particularly useful when Rg and Rlo are either or both other than hydrogen.
As described above, the N-protecting group can then be removed to yield the spiro compounds of formula II.
As an alternative procedure, the introduction of the Xl-Rl and X2-R2 groups can be effected later in the sequence. According to this modification, the protected keto compound of formuia V is treated to remove the protecting group, e.g., with hydrogen bromide, resulting in an intermediate having the formula (XIII) o Il / C
(H2C) p (CH2 ) ~E
H - N - C~COOH
H
which is then acylated with the acid, preferably the acid halide, of formula III to yield the compound of the formula ' . ~ ' ` :` ~ ' .
.
. :
: .
~13Z985 HA180a (XIV) / C
l4 l3 o (H2C)p (CH2) R' - S -(CH) - C- C - N ~ C~-COOH
The groups Xl-Rl and X2-R2 or the spiro group ~ / 10 can then be introduced at this ~ (C)t\
Xl X2 \~, ./
point by the procedures described above to yield the product of formula IV.
Reference is also made to the following publications for additional illustrative methodology for producing starting materials and intermediates:
U.S. Patents 4,046,889, 4,105,776, 4,154,935 and 4,116,962; Can. J. Biochem. & Physiol. 37, 584 (1959); J.A.C.S. 79, 189 (1957); J. Med. Chem. 21, 445 (1978); Aus. J. Chem. 20, 1493-1509 (1967~;
Buehler et al., Survey of Organic Syntheses (Wiley & Sons, 1977), Vol. 1, pages 516-519, Vol. 2 pages 461-470; Chem. Pharm. Bull., Tokyo 26, 2209 and 2217 (1978); Can. J. Chem. 47, 860 (1969);
, .
1~32985 HA180a J~ Amer. Chem. Soc., 80, 6350 (1958); Harrison et al., Compendium o~ Organic Synthetic Methods, (Wiley-Interscience, New Yor~, 1971), pages 449-456;
J. Amer. Chem. Soc., 79, 192 (1956); ~ull. Soc.
Chem., 1965(8) pages 22~53-2259; J. Org. Chem. 25, p. 521-530 (1960).
The procedures illustrated therein can be utilized as general methods for the synthesis of compounds and separation of isomers which can be utilized in the invention described in this application. Additional illustrative details are found in the examples which serve as models for the preparation of other members of the group.
The compounds of this invention form basic salts with a variety of inorganic or organic bases. The salt forming ion derived from such bases can be metal ions, e.g. ! aluminum, alkali metal ions, such as sodium or potassium, alkaline earth metal ions such as calcium or magnesium, or an amine salt ion, of which a number are known for this purpose, for example aralkylamines like, dibenzylamine, N,N-dibenzyl-ethylenediamine, lower alkylamines like methylamine, t-butylamine, procaine, lower alkylpiperidines like N-ethylpiperidine, cycloalkylamines, like cyclo-hexylamine or dicyclohexylamine, l-adamantanamine, benzathine, or salts derived from amino acids like arginine, lysine or the like. The physio-logically acceptable salts like the sodium or potassium salts can be used medicinally as described .
1~32985 HA180a - below and are preferred. These and other salts which are not necessarily physiologically accepta~le are useful in isolating or purifying a product accepta-ble for the purposes described below, as illustrated S with the dicyclohexylamine salt in the examples.
The salts are produced by reacting the acid form of the compound with a equivalent of the base supplying the desired basic ion in a medium in which the sait precipitates or in aqueous medium and then lyophilizing.
The free acid form can be obtained from the salt by conventional neutralization techniques, e.g., with potassium bisulfate, hydrochloric acid, etc.
The compound of formula I wherein R5 is g ~ R8-C- ~ or the disulfide type substituent, especially wherein R5 is hydrogen, are useful as hypotensive agents. They inhibit the conversion of the decapeptide angiotensin I to angiotensin II and, therefore, are useful in relieving angiotensin related hypertension. The actiQn of the enzyme renin on angiotensinogen, a pseudo-globulin in blood plasma, produces angiotensin I.
Angiotensin I is converted by angiotensin converting enzyme (ACE) to angiotensin II. The latter is an active pressor substance which has been implicated as the causative agent in various forms of hypertension in various mammalian species, e.g., rats and dogs.
The compounds of this invention intervene in the angiotensinogen ~ (renin) ~ angiotensin I ~ (ACE) angiotensin II sequence by inhibiting angiotensin ' ' ' , , .
, ' . ~ ~
~132985 ~A180a converting enzyme and reducing or eliminating t.ie formation of the pressor substance angiotensin II.
Thus by the administration of a composition containing one, or a combination of compounds of formula I
S angiotensin dependent hypertension in the species of mammal suffering therefrom is alleviated.
single dose, or preferably two to four divided daily doses, provided on a basis of about 0.1 to 100 mg.
per kilogram of body weight per day, preferabiy about 1 to 15 mg. per kilogram of body weight per day is appropriate to reduce blood pressure. The substance is preferably administered orally, but parenteral routes such as the subcutaneous, intramuscular, intravenous or intraperitoneal routes can also be employed.
The compounds of this invention can also be formulated in combination with a diuretic for the treatment of hypertension. A combination product comprising a compound of this invention and a diuretic can be administered in an effective amount which comprises (for a 70 kg. mammal) a total daily dosage of about 30 to 600 mg., preferably about 30 to 300 mg., of a compound of this invention, and about 15 to 300 mg., preferably about 15 to 200 mg.
of the diuretic, to a mammalian species in need thereof. Exemplary of the diuretics contemplated for use in combination with a compound of this invention are the thiazide diuretics, e.g., chlor-thiazide, hydrochlorthiazide, flumethiazide, hydro-glumethiazide, benzdroflumethiazide, methchlothiazide, : ~ .
.:, -~ .
- :-.
~.Al~Oa --~u--trichlormethiazide, polythiazide or benzthiazide, as well as ethacrynic acid, ticrynafen, chlorthal-idone, furosemide, musolimine, bumetanide, triam-terene, amiloride and spironolactone, and salts of such compounds.
The compounds of formula I can be formulated for use in the reduction of blood pressure in compo-sitions such as tablets, capsules or elixirs for oral administration or in sterile solutions or suspensions for parenteral administration. About 10 to 500 mg.
of a compound or mixture of compounds of formula I
is compounded with a physiologically acceptable vehicle, carrier, excipient, binder, preservative, stabilizer, flavor, etc., in a unit dosage form as called for by accepted pharmaceutical practice.
The amount of active substance in these compositions or preparations is such that a suitable dosage in the range indicated is obtained.
Illustrative process details are set forth in the following examples for the various reactions.
These examples are preferred embodiments and also serve as models for the prepar~tion of other compounds of this invention. The temperatures are given in degrees on the centrigrade scaie.
- . .
. . .
`- 1132985 HA180a Example 1 ~7(S),8S]-7-(Acetylthio)-2-methyl-1-oxopropyl]-1, 4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid a) N-Carbobenzyloxy-4-hydroxy~L-proline 26.5 g. (0.20 mole) of 4-hydroxy-L-proline and 32.8 ml. (0.23 mole) of benzyl chloroformate are reacted in 200 ml. of water and 100 ml. of acetone in the presence of 20 g. (0.02 mole) of potassium bicarbonate and 69.2 g. (0.50 mole) of potassium carbonate and worked up with 90 ml. of concentrated hydrochloric acid as described in Can.
J. Biochem. & Physiol. 37, 584 (1959) to obtain N-carbobenzyloxy-4-hydroxy-L-proline. This product is reacted with cyclohexylamine to form the cyclohexylamine salt yield 69 g. , m.p. 193-195. The salt (34 g.) is neutralized with N-hydrochloric acid to obtain 27 g- of free acid as a colorless glass ~a]D ~70~ (c, 1~ in chloroform).
b) N-carbobenzyloxy-4-keto-L-proline 21.5 g. (0.81 mole) of N-carbobenzyloxy-4-hydroxy-L-proline is oxidized in 1.2 liters of acetone with 83 ml. of 8N chromic acid in sulfuric acid as described in J.A.C.S. 79, 189 (1957). In order to facilitate the subsequent filtration of chromium salts, 30 g. of Celite (diatomaceous earth) is added to the acetone solution before introduction of the oxidizing agent. An air stirrer is employed. The reaction mixture is filtered and the acetone filtrate is concentrated to approximately 300 ml. before diluting with 1 liter of chloroform. The solution is ; washed with 300 ml. of saturated sodium chloride (four times~, dried (Mg5O4), filtered and the solvent evaporated to give :
, , ' ':
~132985 H~180a N-carbobenzyloxy-4-keto-L-proline(22.8 g.) which is crystallized from ether (50 ml.)-hexane (150 ml.) to obtain 17.2 g. (81%) of product, m.p. 99-101, ~a]26 +17 (c, 1~ in chloroform).
c) N-Carbobenzylox~I-4,4-ethylenedioxy-L-proline A stirred mixture of 12.8 g. (0.049 mole) of N-carbobenzyloxy-4-keto-L-proline, 53 ml. (0.095 mole) of ethylene glycol, and 0.35 g. of p-toluene-sulfonic acid H2O in 1.31 1. of benzene is heated and the resulting solution is refluxed for 7 hours (water formed is collected in a Dean-Stark apparatus).
After standing overnight at room temperature, the lower glycol layer is separated and the benzene solution is washed with 150 ml. of saturated sodium chloride, dried (MgSO4), and the solvent evaporated to give 14.6 g. of N-carbobenzyloxy-4,4-ethylenedioxy-L-proline as a syrupy residue. The latter is dissolved in 60 ml. of ethanol, filtered, treated with 5 g.
of cyclohexylamine, and diluted with ether. On seeding and rubbing, the crystalline cyclohexylamine salt separates; weight after cooling overnight, 9.0 g., m.p. 179-180 (s. 173). The material is recrystallized from acetonitrile, m.p. 182-184 (s. 179 )~ [a]D -21 (c, 1% in EtOH).
The cyclohexylamine salt (8.4 g.) is suspended in 40 ml. of ethyl acetate, stirred, cooled, and treated with 40 ml. of lN hydrochloric acid. The layers are separated, the aqueous phase extracted with additional ethyl acetate ( 3 x 40 ml.), the combined organic layers are dried (MgSO4), and the solvent .
:, : .
~ , 113Z985 HA180a evaporated, finally at 0.2 mm. The syrupy residue which begins to Crfstallize is rubbed under ether and the ether evaporated to give 6.4 g. ~42~) of nearly colorless N-carbobenzyloxy-4,4-ethylene-S dioxy-L-proline, m.p. 101-103 (s. 98), la~26 _34 (c, 1~ in CHC13).
d) 4,4-Ethvlenedioxv-L-~roline A solution o~ 3.2 g. (o.0104 mole) of N-carbobenzyloxy-4,4-ethylenedioxy-L-proline in 100 ml.
of methanol-water (2:1) is treated with 1 g. of 5%
palladium-carbon and shaken on the Parr hydrogenator for 6 hours. The catalyst is filtered off under nitrogen, washed with methanol, and the combined filtrates evaporated, finally at 0.1 - 0.2 mm, to give 1.7 g. (94%) of colorless solid, 4,4-ethylene-dioxy-L-proline; m.p. 245-247 (dec.); [a]26 -32 (c,0.5~ in 1:1 MeOH-H2O).
e) [? (s), 8S]-7-[3-(Acetylthio)-2-methyl-1-o:~opropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid A stirred solution of 3.2 g. of 4,4-ethylene-dioxy-L-proline (0.0185 mole) in 50 ml. of water is cooled to 5 and treated portionwise with solid sodium carbonate to pH 8.5. Then while continuing stirring and cooling, a solution of 3.7 g. (0.020 mol.) of D-3-acetylthio-2-methylpropanoyl chloride in 5 ml.
of ether is added portionwise while maintaining the pH at 8.5 with 25% sodium carbonate solution (about 14 ml.). After 1 1~4 :~ours, the solution istreated with 50 ml. of ethyl acetate,stirred, cooled,acidified carefully with hydrochloric acid (1:1) to pH 2.0, :, .:, ' , . :
.
,, :
H~180a saturated with sodium chloride and the layers are separated. The aqueous phase is extracted with additional ethyl acet~te (3 x 50 ml.), the combined organic layers are dried (MgSO4) and the solvent evaporated finally at 0.2 mm. The solid residue is rubbed under ether and the evaporation repeated to obtain 5.9 g. (100%) of [7(S), 8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid; m.p. 108-111.
The product is converted to the dicyclohexyl-amine salt with 3.4 g. of dicyclohexylamine in 70 ml.
of ethyl acetate. On seeding and rubbing, the crystalline salt precipitates and is recrystallized from 95 ml. of acetonitrile; yield 6.7 g., m.p.
187-189 (s. 184), [al25 -59 (c, 1~ in EtOH).
The dicyclohexylamine salt is converted to the free acid by suspending it in ethyl acetate and treating wi~h 75 ml.of 10% potassium bisulfate and stirring until two layers are obtained. After separating, the aqueous phase is extracted with ethyl acetate ( 4 x 75 ml.), the organic layers are combined, dried (MgSO4) and the solvent is evaporated to give 4.1 g. of colorless [7(S),8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, m.p. 120-122 (s. 117) [a]25 -118 (c, 1% in EtOH).
Example 2 [7(S)-8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid Argon is passed through a cold solution of . .
- -- . :
113Z985 HA180a 8.5 ml. of concentrated ammonium hydroxide in 20 ml.
of water. 4.0 g. (0.013 mole) of [7(S),85]-7-[3-tacetylthio)-2-methyl-1-oxopropyl]-1,4-diOxO-7-azaspiro-~4.4]nonane-8-carboxylic acid from Example le are then added and the mixture is stirred in an ice bath for a few minutes and then a room temperature under argon for two hours. The solution is treated with 30 ml. of ethyl acetate,cooled, stirred, and acidified with 16 ml. of of hydro-chloric acid (1:1). The layers are separated, the aqueous phase is extracted with additional 30 ml.
of ethyl acetate (twice),the ethyl acetate extracts are combined, dried (MgSO4) and the solvent evaporated to give 17(s),8s]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid as a solid residue. The product is rubbed under ether and the evaporation is repeated.
The product is then triturated with 30 ml. of hexane, cooled for one hour, filtered under argon and dried in vacuo to give 2.7 g. of colorless solid ~7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, m.p. 131-133 (s. 125), ta]25 -66 (c, 1~ in Et~
Example 3 (S)-1-[(3-Acetylthio)-2-methv]-1-oxopropyll-4,4-dimethoxy-L-proline a) N-Carbobenzyloxy-4,4-dimethoxy-L-proline, methyl ester A stirred solution of 7.8 g. (0.03 mole) of N-carbobenzyloxy-4-keto-L-proline from Example 1 in , '" ' . :
, : .
~ .
.~ . . . . . . . .
, .; :
HA180a 60 ml. of methanol is treated with 96 ml. of tri-methyl orthofo~mate, followed by 0.6 ml. of concentrated sulfuric acid and allowed to stand overnight at room temperature.
The pale yellow solution is stirred, treated with 1.5 g. of potassium carbonate, followed by 30 ml. of water and the bul~ of the solvent is removed on a rotary evaporator to give a syrupy residue which is shaken with 30 ml. of water and 30 ml. of chloroform. After separating the layers the a~ueous phase is extracted with additional chloroform (3 x 30 ml.) and the combined organic layers are washed with 45 ml. of saturated sodium chloride solution and dried (MgSO4). Evaporation of the solvent yields 8.4 g. (88~) of N-carbobenzyl-oxy-4,4-dimethoxy-L-proline, methyl ester.
b) N-Carbobenzyloxy-4,4-dimethoxy-L-proline The ester (8.4 g., 0.026 mole) from part a is dissolved in 80 ml. of methanol, treated dropwise at -1 to 4 with 18 ml. (0.036 mole) of 2N sodium hydroxide kept at 0 for one hour, and at room temperature overnight. After removing about one half of the solvent on a rotary evaporator, the solution is diluted with 150 ml. of water, washed with 100 ml.
of ether (wash discarded), acidified while cooling with 63 ml. of 1:1 hydrochloric acid to pH 2, and extracted with ethyl acetate (4 x 750 ml.). The combined extracts are washed with 50 ml. of saturated sodium chloride solution, dried (MgS04), and the solvent evpaorated to give 8.0 g. of a pale yellow ~ "
.
., . , : . . :~
,.
.
: : "; . ~
:~ : ~ : . ~ . .
1~3Z985 HA18Oa viscous oil. The oil is dissolved in 35 ml. ethancl, treated with 3.0 g. of cyclohexylamine in 10 ml. of ethanol and diluted to 500 ml. with ether. On seeding and rubbing, the crystalline N-carbobenzyloxy-4,4-dimethoxy-L-proline cyclohexylamine salt separated;
weight after cooling overnight, 7.0 g., m.p. 157-159 (s, 151) [~]D ~34 (c, 1~ in EtOH). This material is recrystallized from 100 ml. of acetonitrile to give the salt as a colorless solid, m.p. 158-160 (s, 154) [a]26 _33 (c, 1% in EtOH).
The N-carbobenzyloxy-4,4-dimethoxy-L-proline cyclohexylamine salt is suspended in 40 ml. of ethyl acetate, stirred and treated with 25 ml. cf lN
hydrochloric acid. When two clear layers are obtained lS they are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 40 ml.), the combined organic layers are dried tMgSO4), and the solvent evaporated, finally at 0.2 mm and 40 to yield 7.2 g. (70%) of N-carbobenzyloxy-4,4-dimethoxy-L-proline as a pale yellow viscous syrup.
c) 4,4-Dimethoxy-L-proline .
A solution of N-carbobenzyloxy-4,4-dimethoxy-L-proline (72 g., 0.022 mole) in 210 ml. of methanol-water (2:1) is treated with 2.3 g. of 5% palladium-carbon and shaken on a Parr hydrogenator for 6 hours.The catalyst is filtered off under nitrogen, washed with methanol, and the combined filtrates are evaporated, finally at 0.1 - 0.2 mm., to give a partly crystalline residue. This residue is taken up in 200 ml. of methanol and the evaporation repeated.
,~.
. " .` -:
:. . .
113Z98S HA18Oa When the solid is rubbed under ether (evaporation again repeated) there is obtained 3.6 g. (95%) of nearly colorless 4,4-dimethoxy-L-proline, m.p. 192-19~
(dec.) ; t~]D -47 (c, 1~ in MeOH).
A sample crystallized from methanol-ether is colorless and melts at i97-198 (dec.);[]D -49 (c, 1~ in MeOH).
d) (S)-1-[3-(Acetylthio)-2-methyl-1-oxoprop~1j-4,4-dimethoxy-L-proline A stirred solution of 3.3 g. (0.019 mole) of 4,4-dimethoxy-L-proline in 50 ml. of water is cooled to 5 and brought to pH ~.5 by the addition of 25~
sodium carbonate solution (w/v). Then while continuing stirring and cooling, a solution of 3.8 g. (0.021 mole) of D-3-acetylthio-2-methylpropanoyl chloride in 5 ml.
of ether is added portionwise while maintaining the pH at 7.5 - 8.5 by dropwise addition of 25~ sodium carbonate solution. When the pH has stabilized at 8.2 - 8.4 (after about 15 minutes), stirring and cooling is continued for a total of one hour. The solution is then washed with 50 ml. of ethyl acetate twash discarded, layered over with 50 ml. of ethyl acetate, cooled, stirred, acidified carefully with 1:1 hydrochloric acid to pH 2.0, saturated with sodium chloride, and the layers separated. The aqueous phase is extracted with additional ethyl acetate ( 3 x 50 ml.), the combined organic layers are dried (MgSO4), and the solvent evaporated, finally at 0.2 mm, to give 6.7 g. of syrupy product. This syrup is treated in 70 ml. of ethyl acetate with 3.9 g. of dicyclohexylamine to give 6.5 g.
.
, , .-~329~5 ~180a of colorless (S)-1-[3-(acetylthio)-2-methyl-1-oxo-propyl]-4,4-dimethoxy-L-proline dicyclohexylamine salt in crops (3.1 g. and 3.4 g.), m.p. 158-160 (s, 145 ). [a]D -71 (c, 1% in EtOH).
Following recrystallization from 20 ml. of hot ethyl acetate-60 ml. of hexane, the colorless solid salt weighs 6.0 g., m.p. 158-166 (s, 155), []D -69 (c, 1% in EtOH~.
The dicyclohexylamine salt is c~nverted to the free acid by suspending 5.0 g. in 50 ml. of ethyl acetate, cooling and treating with 60 ml. of 10%
potassium bisulfate solution to give 2 clear layers.
After separating, the aqueous phase is extracted with ethyl acetate (3 x 50 ml.), the combined organic layers are dried (MgSO4), and the solvent evaporated, finally at 0.1 - 0.2 mm. and 45 to give 4.1 g.
(69%) of (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline as a viscous, almost glass-like material la]D -112 (c, 1% in EtOH).
Example 4 (S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline Argon is passed through a cold solution of 8.5 ml. of concentrated ammonium hydroxide in 20 ml. of water for 0.25 hour. The latter is then added while cooling and under a blanket of argon to 4.1 g.
(0.013 mole) of (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline and the mixture is swirled in an icebath until a pale yellow solution is obtained (about 15 minutes). Stirring under J~ -, ,, .
,,: ,: .
113Z985 HA18Oa argon is continued at room temperature for an additional 2 hours, then the solution is extracted with 30 ml. of ethyl acetate (this and subsequent operations are carried out as much as possible under an argon atmosphere~. The aqueous layer is cooled, stirred, layered over with 30 ml. of ethyl acetate, and acidified portionwi~e with approximat~ly 16 ml.
of 1:1 hydrochloric acid. The layers are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 30 ml.), the combined ethyl acetate layers are dried (~gSO4), and the solvent evaporated to gi~e 3.5 g. (100%) of (S)-1-(3-mercapto-2-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline as a colorless, viscous syrup, []D -72 (c, 1% in EtOH).
The latter (3.4 g.) is triturated with 20 ml.
of ethyl acetate, rubbed, diluted with 30 ml. of hexane, and cooled to give a colorless solid, weight 2.6 g., m.p. 108-110 , ~a]D ~77 (c,l~ in EtOH).
Example 5 (S)-1-[3-(~cetylthio)-2-methyl-1-oxopro~yll-4,4-diethoxy-L-proline a) N-Carbobenzyloxy-4,4-diethoxy-L-proline, ethYl ester Following the procedure of Example 3 (a) but substituting triethyl orthoformate for the tri-methyl orthoformate and ethanol for the methanol one obtains 10.8 g. of N-carbobenzyloxy-4,4-diethoxy-L-proline, ethyl ester as a yellow oil.
~,' , , : ,-. . , , :, : ' ' ~
- , "
:., -:.
:: .
. ~ .. .
113Z985 HA180a b) N Carbobenz lox -4 4-diethox -L- roline ~ Y Y , ~ P
The crude ester from part (a) (10.8 g., 0.03 mole) is saponified with 70 ml. of lN sodium hydroxide according to the procedure of Example 4 (b), 30 ml.
of ethanol is added in 10 ml. portions to obtain a solution, to give 10.5 g. of a yellow viscous oil.
This oil is dissolved in 100 ml. of ether and treated with cyclohexylamine (3.0 g.). On seeding and rubbing, 8.3 g. of the crystalline N-carbobenzyloxy-4,4-diethoxy-L-proline cyclohexylamine salt separates; m.p.
123-125 (s. 114 ) ~]D -32 (c, 1% in ethanol).
This material is recrystallized from 20 ml. of acetonitrile to give 7.0 g. of the salt as a colorless solid: m.p. 125-128 (s. 115) [al26 -31 (c, 1% in ethanol).
The N-carbobenzyloxy-4,4-diethoxy-L-proline cyclohexylamine salt is suspended in 40 ml. of ethyl acetate, stirred and treated with 20 ml. of 1 N
hydrochloric acid. The layers are separated and the aqueous phase is extracted with additional ethyl acetate (3 x 40 ml.), the organic layers are combined, dried (MgSO4), and the solvent evaporated to give 5.6 g. (56~) of N-carbobenzyloxy-4,4-diethoxy-L-proline as a light yellow oil.
c) 4,4-Diethoxy-L-proline A solution of the N-carbobenzyloxy-4,4-diethoxy-L-proline (5.6 g., 0.017 mole) in 180 ml. of 2:1 ethanol-water is treated with 2 g. of a 5~ palladium carbon catalyst and shaken under 3 atmospheres of hydrogen for six hours. The crude partly solid : .
" ' . . .
- :
.
1~3Z985 HA18Oa product is rubbed first under ethanol, then ether, and the evaporation repeated each time to give 3 g.
(91%) of nearly colorless solid 4,4-diethoxy-~-proline; m.p. 172-174 (dec.); preceded by gradual darkening and sintering ~a]D6 -40 (c, 1~ in methanol).
Anal. Calc'd. for CgH17N04 : 0.25 H20:
C, 52.03; H, 8.49; N, 6.74 Found: C, 52.22; H, 8.59; N, 6.69.
d) (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-diethoxy-L-proline The 4,4-diethoxy-L-proline (2.9 g., 0.014 mole) from part (c) and 3 g. ~0.017 mole) of D-3-acetylthio-2-methylpropionyl chloride dissolved in 3.5 ml. of ether are reacted in 35 ml. of water in the presence of sodium carbonate according to the procedure of Example 3 (d) to yield 5.4 5. of pale yellow viscous oil. This oily product is treated in 40 ml. of ethyl acetate with 2.6 g. of dicyclo-hexylamine and diluted with 60 ml. of hexane toyield in two crops 4.9 g. of (S)-1-~(3-acetylthio)-2-methyl-l-oxopropyl]-4,4-diethoxy-L-proline dicyclo-hexylamine salt; m.p. 135-138 (s. 132). Following recrystallization from 15 ml. of hot ethyl acetate-45 ml. of hexane, the colorless solid salt weighs4.2 g.: m.p. 138-140 (s. 135), []26 -63 (c, 1~ in ethanol).
Anal. Calc'd. for C15H25N06S C12 23 C, 61.33; H, 9.15; N, 5.30; S, 6.06 30 Pound: C, 61.48; H, 9.55; N, 5.25; S, 5.91.
... ..
:- ~
, , . : . :
-~13Z985 HA18Oa The dicyclohexylamine salt is converted to the free acid by suspendin~ 4.2 g. in 40 ml. of ethyl acetate, cooling and treating with 40 ml. of 10 potassium bisulfate solution to give two layers.
After separa~ing, the aqueous phase is extracted with ethyl acetate (3 x 50 ml.), the combined organic layers are dried (MgS04), and the solvent evaporated to give 3.0 g. (61%) of (S)-1-[3-(acetylthio)-2-methyl-l-oxopropyll-4~4-diethoxy-L-proline as a pale yellow viscous syrup.
Example 6 (S)-4,4-Diethoxy-1-(3-Mercapto-2-methyl-1-oxopropyl)-L-proline Argon is passed through a cold solution of 5.5 ml. of concentrated ammonium hydroxide in 13 ml.
of water for 0.25 hour. The latter is then added while cooling under a blank~t of argon to 3.0 g.
~0.0086 mole) of (S)-1-[3-~acetylthio)-2-methyl-l-oxopropyl]-4,4-diethoxy-L-proline and the mixture is worked up as described in Example 4 to yield 2.4 g. (92~) of (S)-4,4- diethoxy-1-(3-mercapto-2-methyl-1-oxopropyl)-L-proline as a nearly colorless viscous syrup ~al26 -64, (c, 1% in ethanol).
Anal. Calc d. for C13 23 5 2 C, 50.38; H, 7.64; N, 4.52; S, 10.35 Found: C, 50.68; H, 7.96; N, 4.78; S, 10.07.
Example 7 [2(S),3S]-2-[3-(Acetylthio)-2-methyl-1-oxopropyl]-6,10-dioxo-2-azaspiro[4.5]decane-3-carboxylic acid ~
a) N-Carbobenzy oxy-4,4-trimethylenedioxy-L-proline ~; ~
, , , - : :
: .
~A18Oa _3a_ Interaction of 8.2 g. (0.031 mole) of N-carbobenzyloxy-4-keto-L-proline and 45 ml. (0.62 mole) of 1,3-propanediol in 450 ml. of benzene in the presence of 500 mg. of p-toluenesulfonic acid gi~es 12.3 g. of crude viscous ester nroduct.
This product is saponified with 70 ml. of lN
sodium hydroxide to give 10.6 g. of crude N-carbo-benzyloxy-4,4-trimethylenedioxy-L-proline as a yellow oil. The latter is dissolved in 40 ml.
of ethanol - 400 ml. ether and treated with
3.2 g. of cyclohexylamine to yield 10.1 g. ofW-carbo-benzyloxy-4,4-trimethylenedioxy-L-proline, cyclohexyl-amine salt; m.p. 163-165 (s. 160), [a]26 -27 (c, 1% in ethanol). Crystallization of 9.8 g. of the salt from 300 ml. of acetonitrile yields 9.5 g. of colorless solid cyclohexylamine salt;
m.p. 165-167 (s, 162) [al25 -27 (c, 1~ in ethanol).
The cyclohexylamine salt (9.0 g.) is suspended in 40 ml. of ethyl acetate, stirred, cooled, and treated with 45 ml. of 1 N hydrochloric acid.
The layers are separated, the aqueous phase extracted with additional ethyl acetate (3 x 40 ml.), the combined organic layers are dried (MgS04), and the solvent evaporated to give 7.1 g. (75%) of glass-like N-carbobenzyloxy-4,4-trimethylenedioxy-L-proline.
b) 4,4-Trimethylenedioxy-L-proline A solution of 7.1 g. (0.022 mole) of N-carbobenzyloxy-4,4-trimethylenedioxy-L-proline in 200 ml. of 2:1 methanol-water is hydrogenated in ..
~. , : . .- . , - :
- , ' ~ , . ~: '.' , , . . ~, .
~ ., -1~32985 HAlaOa-35-the presence of 2 g. of 5~ palladium- carbon catalyst to give 3.8 g. (93~) of nearly colorless 4,4-tri-methylenediaxy-L-proline; m.p. 234-236 (dec.); preceded by gradual darkening and sintering; [a]25 -36 (c, 0.5~ in 1:1 methanol-water).
Anal. Calc'd. for C8~13NO4:
C, 51.33; H, 7.00; N, 7.48 Found: C, 51.42; H, 7.11; N, 7.40.
c) ~2(S),3S~-2-[3-(Acetylthio)-2-methyl-1-oxopropyl]-6,10-dioxo-2-azaspiro[4,5]decane-3-carboxylic acid
m.p. 165-167 (s, 162) [al25 -27 (c, 1~ in ethanol).
The cyclohexylamine salt (9.0 g.) is suspended in 40 ml. of ethyl acetate, stirred, cooled, and treated with 45 ml. of 1 N hydrochloric acid.
The layers are separated, the aqueous phase extracted with additional ethyl acetate (3 x 40 ml.), the combined organic layers are dried (MgS04), and the solvent evaporated to give 7.1 g. (75%) of glass-like N-carbobenzyloxy-4,4-trimethylenedioxy-L-proline.
b) 4,4-Trimethylenedioxy-L-proline A solution of 7.1 g. (0.022 mole) of N-carbobenzyloxy-4,4-trimethylenedioxy-L-proline in 200 ml. of 2:1 methanol-water is hydrogenated in ..
~. , : . .- . , - :
- , ' ~ , . ~: '.' , , . . ~, .
~ ., -1~32985 HAlaOa-35-the presence of 2 g. of 5~ palladium- carbon catalyst to give 3.8 g. (93~) of nearly colorless 4,4-tri-methylenediaxy-L-proline; m.p. 234-236 (dec.); preceded by gradual darkening and sintering; [a]25 -36 (c, 0.5~ in 1:1 methanol-water).
Anal. Calc'd. for C8~13NO4:
C, 51.33; H, 7.00; N, 7.48 Found: C, 51.42; H, 7.11; N, 7.40.
c) ~2(S),3S~-2-[3-(Acetylthio)-2-methyl-1-oxopropyl]-6,10-dioxo-2-azaspiro[4,5]decane-3-carboxylic acid
4,4-Trimethylenedioxy-L-proline (3.7 g., 0.02 mole) is acylated with 4.0 g. (0.022 mole) of D-3-acetylthio-2-methylpropionyl chloride in 50 ml.
of water in the presence of sodium carbonate according to the procedure of Example 1 (e) to give 7.3 g.
of glass-like crude product.
The product is converted to its dicyclohexyl-amine salt with 3.6 g. of dicyclohexylamine in 70 ml.
of ethyl acetate. On seeding and rubbing, the crystalline salt precipitates to yield 7.5 g. of dicyclohexylamine salt; m.p. 168-170 (s. 166), [a]D ~59 (c, 1% in ethanol). Recrystallization from 30 ml. of acetonitrile gives 6.5 g. of colorless solid salt; m.p. 169-171, [a]25 -63, (c, 1~ in ethanol).
The dicyclohexylamine salt is converted to the free acid by suspending 6.4 g. in 75 ml.
of ethyl acetate and treating with 75 ml. of 10 potassium bisulfate and stirring until two layers are obtained. After separating, the aqueous 1~3Z985 HA18Oa phase is extracted with ethyl acetate (4 x 75 ml.), the organic layers are combined, dried ~MgS04), and the solvent e~aporated to give 4.3 g. ~67%) of glass-like ~2(S),3S]-2-[3-(acetylthio)-2-methyl-1-oxopropyl]-6,10-dioxo-2-azaspiro~4,5]decane-3-carboxylic acid.
Example 8 [2(S),3S~-2-(3-~1ercapto-2-methyl-1-oxopropyl)-h,10-dioxo-2-azas~iro14,5]decane-3-carboxylic acid [2(S),3S]-2-[3-(Acetylthio)-2-methyl-1-oxopropyl]-6~lo-dioxo-2-azaspiro[4~5]decane-3-carboxylic acid (4.3 g., 0.013 mole) is hydrolyzed with 8.5 ml.
of concentrated ammonia in 20 ml. according to the procedure of Example 2 to yield 0.9 g. of colorless solid product; ~]25 -64 (c, 0.5% in ethanol). An additional 0.8 g. of product is obtained by extracting the aqueous phase uith chloroform; [a]D5 -66 . The two crops are dissolved in chloroform, evaporated, rubbed under ether, and the evaporating repeated to yield 1.7 g. (46~) of t2(S),3S1-2-(3-mercapto-2-methyl-1-oxopropyl)-6,10-dioxo-2-azaspiro[4,5]decane-3-carboxylic acid; m.p. 169-171 (s. 167 ), [a]25 -71 (c, 1% in methanol).
Anal. Calc'd. for C12HlgN05s:
C, 49.81; H, 6.62; N, 4.84; S, 11.08 Found: C, 49.67; H, 6.67; N, 4.93; S, 11.10.
Example 9 [7(S),8S]-7-[3-(AcetYlthio)-2-methyl-1-oxopro?vl]-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid a) N-Carbobenzyloxy-4,4-ethylenedithio-L-proline, methyl ester A stirred solution of 3.9 g. (0.014 mole) of HA180a N-carbobenzyloxy-4-keto-L-proline, methyl ester in 6~ ml. of methylene chloride is treated with 3 ml.
(0.036 mole) of ethanedithiol, cooled to 8, and treated under an argon blanket with 3 ml. (0.024 mole) of boron trifluoride etherate. After removing the cooling bath, the pale yellow solution is stirred for an additional hour and kept overnight at room temperature. The solution is stirred, treated with several pieces of crushed ice, followed by 20 ml.
of water. After 30 minutes the layers are separated and the aqueous phase (50 ml.) is extracted with additional methylene chloride (3 x 30 ml.). The combined organic layers are washed with 50 ml. of saturated sodium chloride solution, dried (MgSO4), and the solvent removed on a rotary evaporator to give 6 g. (100%) of a pale yellow oil N-carbo-benzyloxy-4,4-ethylenedithio-L-proline, methyl ester.
b) N-Carbobenzyloxy-4,4-ethylenedithio-L-proline The methyl ester product from part (a) (7.4 g., approximately 0.018 mole) is dissolved in 65 ml. of methanol, treated dropwise at -1 to 4 with 14.5 ml. (0.029 mole) of 2N sodium hydroxide, kept at 0 for one hour, and at room temperature overnight. After removing about half the solvent on a rotary evaporator, the solution is diluted with 125 ml. of water, washed with ether (wash discarded), acidified while cooling with 5 ml. of 1:1 hydro-chloric acid to a pH of 2, and extracted with ethyl acetate (4 x 50 ml.). The combined extracts are washed with S0 ml. of saturated sodium chloride, `
`
.
113~85 HA180a dried (MgSO4), and the solvent evaporated to give fi g.
of a pale yellow viscous oil. This oil is dissolved in 25 ml. of ethanol, treated with 1.8 g. of cyclohexylamine in 5 ml. of ethanol, and diluted to 300 ml. with ether. On seeding and rubbing, the crystalline cyclohexylamine salt separates to yield after overnight cooling 5.7 g. of N-carbo-benzyloxy-4,4-ethylenedithio-L-proline cyclohexyl-amine salt; m.p. 205-207 (s. 201). Recrystallization from 50 ml. of ethanol-400 mi. ether yields 4.9 g. of colorless solid salt; m.p. 207-209 (s. 201), [a]25 -15 (c, 1% in chloroform).
The cyclohexylamine salt (4.8 g.) is suspended in 25 ml. of ethyl acetate, stirred, and treated with 25 ml. of lN hydrochloric acid. When two clear layers are obtained, they are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 25 ml.), the combined organic layers are dried (MgSO4), and the solvent evaporated to give 3.8 g.
(62%) of N-carbobenzyloxy-4,4-ethylenedithio-L-proline as a pale yellow viscous syrup.
c) 4,4-Ethylenedithio-L-proline, hydrobromide N-Carbobenzyloxy-4,4-ethylenedithio-L-proline ~3.7 g., 0.011 mole) is treated with 20 ml. of hydrogen bromide in acetic acid (30 - 32~), stoppered loosely, and stirred magnetical~y. ~ixing is difficult due to the viscosity of the starting material and the latter is broken up as much as possible with a spatula. In the meantime, the crystalline product begins to separate. Further .
::
;., . , ~ .
ll~Z98~
H~180a quantities of hydrogen bromide in acetic acid are added after 15 minu'es (10 ml.) and after 2; minutes (5 ml.) and stirrin~ is continued for a total of 35 minutes. Ether (250 ml.) is added to complete precipitation of the product and after cooling for 15 minutes the cream colored material is filtered under nitrogen, washed with ether, and dried in vacuo to give 2.7 g. of 4,4-ethylenedithio-L-proline, hydrobromide; m.p. 240-242 (dec.); sintering and darkening from approximately 200; [a]D6 _40o (c, 0.5% in 1:1 chlo~oform-methanol).
d) [7(5),8S]-7-[3-(Acetylthio)-2-methYl-l-oxoproPyl]-7-aza-1,4-dithias~iro[4 4]nonane-8-carboxylic acid A stirred solution of 2.6 g. (0.~091 mole) of 4,4-ethylenedithio-L-proline, hydrobromide in 25 ml. of water is cooled to 5 and brought to pH 8.2 by the addition of 25% sodium carbonate (wt./vol.). While continuing stirring and cooling, a solution of 1.9 g. (0.01 mole) of D-3-acetylthio-2-methylpropionyl chloride in 2.5 ml. of ether isadded portionwise whiIe maintaining the pH at J.5 - 8.2 by the dropwise addition of 25% sodium caxbonate. When the pH is stabilized at 8.2 - a . s (after about 15 minutes), stirring and cooling are continued for a total of one hour. The solution is then washed with 25 ml. of ethyl acetate ~wash discarded), layered over with 25 ml. of ethyl acetate, cooled, stirred, acidified carefully with 1:1 hydrochloric acid to pH 2.0, saturated with sodium chloride, and the layers separated. The HA180a _4~_ aqueous phase is extracted with additional ethyl acetate (3 x 25 ml.), the combined organic layers dried (MgSO4), and the solvent evaporated, finally at 0.2 mm., to give 2.6 g. of syrupy product which
of water in the presence of sodium carbonate according to the procedure of Example 1 (e) to give 7.3 g.
of glass-like crude product.
The product is converted to its dicyclohexyl-amine salt with 3.6 g. of dicyclohexylamine in 70 ml.
of ethyl acetate. On seeding and rubbing, the crystalline salt precipitates to yield 7.5 g. of dicyclohexylamine salt; m.p. 168-170 (s. 166), [a]D ~59 (c, 1% in ethanol). Recrystallization from 30 ml. of acetonitrile gives 6.5 g. of colorless solid salt; m.p. 169-171, [a]25 -63, (c, 1~ in ethanol).
The dicyclohexylamine salt is converted to the free acid by suspending 6.4 g. in 75 ml.
of ethyl acetate and treating with 75 ml. of 10 potassium bisulfate and stirring until two layers are obtained. After separating, the aqueous 1~3Z985 HA18Oa phase is extracted with ethyl acetate (4 x 75 ml.), the organic layers are combined, dried ~MgS04), and the solvent e~aporated to give 4.3 g. ~67%) of glass-like ~2(S),3S]-2-[3-(acetylthio)-2-methyl-1-oxopropyl]-6,10-dioxo-2-azaspiro~4,5]decane-3-carboxylic acid.
Example 8 [2(S),3S~-2-(3-~1ercapto-2-methyl-1-oxopropyl)-h,10-dioxo-2-azas~iro14,5]decane-3-carboxylic acid [2(S),3S]-2-[3-(Acetylthio)-2-methyl-1-oxopropyl]-6~lo-dioxo-2-azaspiro[4~5]decane-3-carboxylic acid (4.3 g., 0.013 mole) is hydrolyzed with 8.5 ml.
of concentrated ammonia in 20 ml. according to the procedure of Example 2 to yield 0.9 g. of colorless solid product; ~]25 -64 (c, 0.5% in ethanol). An additional 0.8 g. of product is obtained by extracting the aqueous phase uith chloroform; [a]D5 -66 . The two crops are dissolved in chloroform, evaporated, rubbed under ether, and the evaporating repeated to yield 1.7 g. (46~) of t2(S),3S1-2-(3-mercapto-2-methyl-1-oxopropyl)-6,10-dioxo-2-azaspiro[4,5]decane-3-carboxylic acid; m.p. 169-171 (s. 167 ), [a]25 -71 (c, 1% in methanol).
Anal. Calc'd. for C12HlgN05s:
C, 49.81; H, 6.62; N, 4.84; S, 11.08 Found: C, 49.67; H, 6.67; N, 4.93; S, 11.10.
Example 9 [7(S),8S]-7-[3-(AcetYlthio)-2-methyl-1-oxopro?vl]-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid a) N-Carbobenzyloxy-4,4-ethylenedithio-L-proline, methyl ester A stirred solution of 3.9 g. (0.014 mole) of HA180a N-carbobenzyloxy-4-keto-L-proline, methyl ester in 6~ ml. of methylene chloride is treated with 3 ml.
(0.036 mole) of ethanedithiol, cooled to 8, and treated under an argon blanket with 3 ml. (0.024 mole) of boron trifluoride etherate. After removing the cooling bath, the pale yellow solution is stirred for an additional hour and kept overnight at room temperature. The solution is stirred, treated with several pieces of crushed ice, followed by 20 ml.
of water. After 30 minutes the layers are separated and the aqueous phase (50 ml.) is extracted with additional methylene chloride (3 x 30 ml.). The combined organic layers are washed with 50 ml. of saturated sodium chloride solution, dried (MgSO4), and the solvent removed on a rotary evaporator to give 6 g. (100%) of a pale yellow oil N-carbo-benzyloxy-4,4-ethylenedithio-L-proline, methyl ester.
b) N-Carbobenzyloxy-4,4-ethylenedithio-L-proline The methyl ester product from part (a) (7.4 g., approximately 0.018 mole) is dissolved in 65 ml. of methanol, treated dropwise at -1 to 4 with 14.5 ml. (0.029 mole) of 2N sodium hydroxide, kept at 0 for one hour, and at room temperature overnight. After removing about half the solvent on a rotary evaporator, the solution is diluted with 125 ml. of water, washed with ether (wash discarded), acidified while cooling with 5 ml. of 1:1 hydro-chloric acid to a pH of 2, and extracted with ethyl acetate (4 x 50 ml.). The combined extracts are washed with S0 ml. of saturated sodium chloride, `
`
.
113~85 HA180a dried (MgSO4), and the solvent evaporated to give fi g.
of a pale yellow viscous oil. This oil is dissolved in 25 ml. of ethanol, treated with 1.8 g. of cyclohexylamine in 5 ml. of ethanol, and diluted to 300 ml. with ether. On seeding and rubbing, the crystalline cyclohexylamine salt separates to yield after overnight cooling 5.7 g. of N-carbo-benzyloxy-4,4-ethylenedithio-L-proline cyclohexyl-amine salt; m.p. 205-207 (s. 201). Recrystallization from 50 ml. of ethanol-400 mi. ether yields 4.9 g. of colorless solid salt; m.p. 207-209 (s. 201), [a]25 -15 (c, 1% in chloroform).
The cyclohexylamine salt (4.8 g.) is suspended in 25 ml. of ethyl acetate, stirred, and treated with 25 ml. of lN hydrochloric acid. When two clear layers are obtained, they are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 25 ml.), the combined organic layers are dried (MgSO4), and the solvent evaporated to give 3.8 g.
(62%) of N-carbobenzyloxy-4,4-ethylenedithio-L-proline as a pale yellow viscous syrup.
c) 4,4-Ethylenedithio-L-proline, hydrobromide N-Carbobenzyloxy-4,4-ethylenedithio-L-proline ~3.7 g., 0.011 mole) is treated with 20 ml. of hydrogen bromide in acetic acid (30 - 32~), stoppered loosely, and stirred magnetical~y. ~ixing is difficult due to the viscosity of the starting material and the latter is broken up as much as possible with a spatula. In the meantime, the crystalline product begins to separate. Further .
::
;., . , ~ .
ll~Z98~
H~180a quantities of hydrogen bromide in acetic acid are added after 15 minu'es (10 ml.) and after 2; minutes (5 ml.) and stirrin~ is continued for a total of 35 minutes. Ether (250 ml.) is added to complete precipitation of the product and after cooling for 15 minutes the cream colored material is filtered under nitrogen, washed with ether, and dried in vacuo to give 2.7 g. of 4,4-ethylenedithio-L-proline, hydrobromide; m.p. 240-242 (dec.); sintering and darkening from approximately 200; [a]D6 _40o (c, 0.5% in 1:1 chlo~oform-methanol).
d) [7(5),8S]-7-[3-(Acetylthio)-2-methYl-l-oxoproPyl]-7-aza-1,4-dithias~iro[4 4]nonane-8-carboxylic acid A stirred solution of 2.6 g. (0.~091 mole) of 4,4-ethylenedithio-L-proline, hydrobromide in 25 ml. of water is cooled to 5 and brought to pH 8.2 by the addition of 25% sodium carbonate (wt./vol.). While continuing stirring and cooling, a solution of 1.9 g. (0.01 mole) of D-3-acetylthio-2-methylpropionyl chloride in 2.5 ml. of ether isadded portionwise whiIe maintaining the pH at J.5 - 8.2 by the dropwise addition of 25% sodium caxbonate. When the pH is stabilized at 8.2 - a . s (after about 15 minutes), stirring and cooling are continued for a total of one hour. The solution is then washed with 25 ml. of ethyl acetate ~wash discarded), layered over with 25 ml. of ethyl acetate, cooled, stirred, acidified carefully with 1:1 hydrochloric acid to pH 2.0, saturated with sodium chloride, and the layers separated. The HA180a _4~_ aqueous phase is extracted with additional ethyl acetate (3 x 25 ml.), the combined organic layers dried (MgSO4), and the solvent evaporated, finally at 0.2 mm., to give 2.6 g. of syrupy product which
5 begins to crystallize. The latter is treated in 30 ml.
of ethyl acetate with l.S g. of dicyclohexylamine to give 3.0 g. of colorless dicyclohexylamine salt;
m.p. 176-178 (s, 170 ); [a]D ~55 (C~ 1~ in ethanol). This material is ground in a mortar under lS ml. of acetonitrile, cooled for one hour, filtered, washed with 5 ml. of cold acetonitrile and with ether, and dried to give 2.9 g. of dicyclohexylamine salt; m.p. 177-179 (s, 172); 1~26 56 in ethanol).
Anal. Calc d 13 19 4 12 23 C, 56.56; H, 7.98; N, 5.28; S, 18.12 Found: C, 56.21; H, 8.18; ~I, 5.05; S, 18.00.
The above dicyclohexylamine salt is converted to the free acid by suspending 2.8 g. in 30 ml. of ethyl acetate, cooling, and treating with 30 ml. of 10~
potassium bisulfate to give two clea~r layers. After separating, the aqueous phase is extracted with ethyl acetate (3 x 30 ml.), the combined organic layers dried (MgSO4), and the solvent evaporated, finally at 0.1 -0.2 mm and 45, to give 2.0 g.
(63%) of colorless solid f7(S),8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyll-7-aza-1,4-dithiaspiro f 4.4] -nonane-8-carboxylic acid, m.p., 125-126 (S, 122);
- 1]D6 -101 (C, 1~ in ethanol).
, . :' ,.~` -` 1132985 H~180a Example 10 ~7(S),8S]-7-(3-Mercapto-2-methyl-1-oxo~ropyl)-7-aza-1,4-dithiaspiro~4.4~nonane-8-carbo~ylic acid Argon is passed through a cold solution of 3.5 ml. of concentrated ammonia in 8.5 ml. of water for lS minutes. The latter is then added while cooling and under a blanket of argon to 1.9 g.
(0.0054 mole) of [7(S),8S~-7-[3-(acetylthio)-2-methyl-l-oxopropyl]-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid and ~he mixture is swirled in an ice-bath until a solution is obtained. Stirring under argon is continued at room temperature for an additional two hours, then the solution is extracted with 15 ml. of ethyl acetate under an argon atmosphere. The aqueous layer is cooled, stirred, layered over with 15 ml. of ethyl acetate, and acidified portionwise with approximately 6.5 ml.
of 1:1 hydrochloric acid. The layers are separated, the aqueous phase extracted with additional ethyl acetate (3 x 15 ml.), the combined acetate layers dried (MgSO ), and the solvent evaporated to give a glass-like residue which solidifies when rubbed under ether. The evaporation is repeated and the colorless product is suspended in 30 ml. of hexane, filtered and dried in vacuo to give 1.4 g. (84~) of [7~5),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-7-aza-1,4-dithiaspirot4.4]nonane-8-carboxylic acid;
m.p. 116-118 (s, 105); [a]26 -44 (c, 1% in ethanol).
Anal. Calc'd. for C11~17NO3S3:
:
~-HA180a C, 42.97; ~, 5.5~; N, 4.56; S, 31.29; SH, 100~
Found: C, 42.70, H, 5.71; N, 4.54; S, 31.16; SH, 100%.
Example 11 [7(S)r8S3-7-(3-Mercapto-2-methyl-1-oxopropYl)-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid a) [7(S),8S~-7-[3-(~cetylthio)-2-methyl-1-oxopropyl~-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid Following the procedure of Example 1 but sub-stituting an equivalent amount of N-carbobenzyloxy-5-keto-L-pipecolic acid for the N-carbobenzyloxy-4-keto-L-proline in part (c) and then following the procedure of parts (d) and (e) one obtains, [7(S),8 ~-7-~3-(acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid.
b) ~7(S)!8S]-7-(3-Mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid.
Example 12 [l(S),2s]-1-(3-Mercapto-2-methyl-1-oxopropyl)-5,5-dimethoxy-2-piperidinecarboxylic ~cid a) [l(S),2S]-1-[3-(Acetylthio-2-methyl-l-oxopropyl]-5,5-dimethoxy-2-piperidinecarboxylic acid Following the procedure of Example 3 but substituting an equivalent amount of N-carbobenzyloxy-5-keto-Lopipecolic acid for the N-carbobenzyloxy-4-keto-L-proline in part (a) one obtains [l~S),25l-1-~, ~
~13Z985 HAl~Oa t3-(acetylthio)-2-methyl-1-oxopropyl3-5,s-dimethoxy-2-piperidinecarboxylic acid.
b) ll(S),2S]-1-(3-Mercapto-2-methyl-1-oxopropyl)-5,5-dimethoxy-2-piperidinecarboxylic acid The product from part ~a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield [l(S),2S]-1-(3-mercapto-2-methyl-l-oxopropyl)-5,5-dimethoxy-2-piperidinecarboxylic acid.
Example 13 [l(S),2-1-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-2-piperidinecarboxylic acid a) [l(S),2-]-1-[3-(Acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-2-piperidinecarboxylic acid Following the procedure of Example 3 but substituting an equivalent amount of N-carbobenzyloxy-4-keto-2-pipecolic acid for the N-carbobenzyloxy-4-keto-L-proline in part (a) one obtains [l(S),2-]-1-13-(acetylthio)-2-methyl-1-oxopropyll-4,4-diethoxy-2-piperidinecarboxylic acid.
b) [l(S),2-]-1-[3-Mercapto-2-methyl-1-oxopropyl)-4, 4-dimethoxy-2-piperidinecarboxylic acid - The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield [l(S),2-]-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-2-piperidinecarboxylic acid.
, .
113298~ HAl 8 0 a Example 14 [2(S),3S]-2-(3-Mercapto-2-methyl-1-oxopropyl)-6,10-di-thia-2-azaspiro~4.5]decane-3-carboxvlic acid a) [2(S),3S]-2-~3-(Acetylthio)-2-methyl-l-oxopropyl)-6,10-dithia-2-azaspiro[4.5~decane-3-carboxy-lic acid Following the procedure of Example 9 but substituting 1,3-propanedithiol for the ethanedithiol in part (a), one obtains [2(S),3S]-2-[3-(acetylthio)-2-methyl-1-oxopropyl~-6,10-dithio-2-azaspiro[4.5~decane-3-carboxylic acid.
b) [2(S),3S~-2-(3-Mercapto-2-methyl-1-oxoProPvl)-6,10-dithia-2-azaspiro~4.5~decane-3-carboxylic acid The product from part (a) is hydrolyzed lS with concentrated ammonia according to the proced~re of Example 10 to yield [2(S),3S~-2-(3-mercapto-2-methyl-l-oxopropyl)-6,10-dithia-2-azaspiro[4.5~decane-3-carboxylic acid.
Example 15 [7~S),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1-oxo-4-thia-7-azaspiro[4.4~nonane-8-carboxylic acid a) [7(S),8S]-7-[3-(Acetylthio)-2-methyl-1-oxoproPyl]-l-oxo-4-thia-7-azaspiro[4.4]nonane-8-carboxylic acid Following the procedure of Example 1 but substituting 2-mercaptoethanol for the ethylene glycol in part (c), one obtains [7(S).8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyl]-1-oxo-4-thia-7-azaspiro[4.4]nonane-8-carboxylic acid.
- , , ` ~ ' - ~`
~i32985 H~180a b) [7~S),8S]-7-(3-Mercapto-2-methYl-l-oxopropYl)-l-oxo-4-thia-7-azaspiro~4.4]nonane-8-c~rbo~ylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure S of Example 2 to yield [7(S),85]-7-(3-mercapto-2-methyl-1-oxopropyl)-1-oxo-~-thia-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 16 (8S)-7-[3-(Acetylthio)-2-trifluoromethyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4~nonane-8-carboxylic acid (Isomers A and ~) a) D,L-3-(Acetylthio)-2-trifluoromethylpropionic acid a-Trifluoromethyl acrylic acid (10 g., 0.071 mole) ~prepared according to the procedure set forth J. Chem. Soc., 1954, p. 371] is cooled in a salt-ice-water bath, stirred and treated portionwise with 5.7 ml. (0.075 mole) of 97% thiolacetic acid.
After the addition, the yellow liquid is stirred in the cold for one hour, allowed to warm to room temperature, and distilled to yield 14 g. (91%) of D,L-3-(acetylthio)-2-trifluoromethylpropionic acid as a light yellow oil, b.p. 149-153/13 mm. The material solidifies on storing in the cola.
b) D,~-3-(Acetylthio)-2-trifluoromethylpropionyl chloride The D,L-3-(acetylthio)-2-trifluoromethyl-propionyl acid (7 g., 0.032 mole) is treated with 18 ml. (0.25) of redistilled thionyl chloride and the mixture is refluxed for three hours. After ,:
. --H.~l8oa removing the excess thionyl chloride on a rotary evaporator, the residue is distilled to give 6.8 g.
of D,L-3-(acetylthio)-2-trifluoromethylpropionyl chloride as a pale yellow oil; b.p. 80-82/16 mm.
c) (8S)-7-[3-(Acetylthio)-2-trifluoromethyl-1-oxopropy~ 4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid (Isomers A and B) .
4,4-Ethylenedioxy-L-proline (2.4 g., 0.014 mole) is reacted with 3.4 g. (0.014 mole) of D.L-3-(acetylthio)-2-trifluoromethylpropionyl chloride in 40 ml. of water in the presence of sodium carbonate according to the procedure of Example 1 (e) to yield 4.5 g. of nearly colorless solid product; m.p.
126-145 (s. 115 ), [a~D -34 (c, 1~ in ethanol).
The mixture of diastereoisomers (4.2 g.) is suspended in 45 ml. of ether, stirred for two hours, cooled for 20 minutes, and the undissolved solid is filtered, washed with cold ether, and air dried to yield 2.7 g. of product; m.p. 166-172 (s. 140 ), ~al25 -62 (c, 13 in ethanol). The material is then ground in a mortar under 25 ml. of ether, filtered after 15 minutes, washed with some ether, and again air-dried to yield 2.1 g. of product; m.p. 172-177 (s. 143). Following crystallization from 11 ml. of boiling isopropanol and cooling overnight, -1.55 g. of colorless (8S)-7-[3-(acetylthio)-2-trifluoromethyl-l-oxopropyl]-1,4-dioxo-7-azaspir~-~4.4]-nonane-8-carboxylic acid, isomer A is obtained; m.p.
192-194 (s, 183), [~25 -32 tc, 1% in ethanol).
I 3~ A sample is recrystaLlized from isopropanol~ m.p.
. .
, .
-' ~ ' ,--- ' ~
9 ~ HA18Oa 193-195 ~s, 184), ta]D -134 (c, 1% in ethanol).
Isomer ~ is obtained by combining the above ether and isopropanol filtrates and removing the solvents under reduced pressure to give S 2.2 g. of a pale yellow solid; m.p. 108-109 ~5, 95 ); [a]25 + 30 (c, l~ in ethanol). This material is purified by crystallization from 6 ml.
of isopropanol to give 1.2 g. of nearly colorless solid; m.p. 153-155 (s, 130?, [a]25 +40 (c, 1% in ethanol). After crystallization from 4 ml. of ethyl acetate -6 ml. of hexane, 1.1 g. of (8S)-7-[3-(acetylthio)-2-trifluoromethyl-l-oxopropyl]-1,4-dioxo-7-aza-spiro[4.4lnonane-8-carboxylic acid, isomer B; m.p.
lS 153-lSS (s, 141), ~a]25 +41 (c, 1% in ethanol) is obtained.
Example 17 (8S)-7-(3-Mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, Isomer A
Isomer A product from Example 16 (1.45 g., 0.0039 mole) is hydrolyzed with 2.5 ml. of concentrated ammonia in 6 ml. of water over a period of one hour as described in Example 2 to yield 1.25 g. ~97%) of colorless ~8S)-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, isomer A, as a glass-like product, [a]D -61 (c, 1% in ethanol). TLC:Rf 0.40 (95:5:5 methylene chloride -methanol - acetic acid;
vis. SH reagent, PMA and heat).
.
- . .
:, . . ;
. .
. ~
1~3Z985 HA180a -4~-Anal. Calc'd. for CllHl~F3NOss:
C, 40.12; H, 4.28; N, 4.25; 5, 9.74; F, 17.31 Found: C, 40.10, H, 4.43; N, 4.51; S, 9.63; F, 17.10.
The above acid is dissolved in ethyl acetate and treated with l-adamantanamine to yield ~he 1-adamantanamine salt; m.p. 213-215 (dec.), [al25 -47 c, 1% in methanol).
Example 18 (8S)-7-(2-Mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-c2rboxylic acid, Isomer B
Isomer B product from Example 16 (1.05 g., 0.0028 mole) is hydrolyzed with 2 ml. of concentrated ammonia in S ml. of water according to the procedure described in Example 2 to yield 0.9 g. (97~) of (8S)-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, Isomer B as a pale yellow viscous syrup,; [a]D5 -16 (c, 1~ in ethanol).
The material sets to a waxy solid;m.p.61-64 (s .SS ) Anal. Calc d- for: 11 14 3 S 2 C, 39.5,8; H, 4.38; N, 4.20; S, 9.61; F, 17.01 Found: C, 39.60; H, 4.28; ~, 4.26; S, 9.62; F, 16.89.
Example 19 1-~3-(Acet~lthio)-2-trifluoromethyl-1-oxopropyl]-4,4-dimethoxy-L-proline, Isomers A and B
Following the procedure of Example 16 but substituting 4,4-dimethoxy-L-proline for the 4,4-ethylenedioxy-L-proline in part (c), one obtains 1-[3-(acetylthio)-2-trifluoromethyl-1-oxopropyl]-4,4-dimethoxy-L-proline as a racemic mixture. The ~13Z98S
HAl~Oa _aa_ individual isoners can be separated as taught in Example 16.
Example 2~
1-(3-Mercapto-2-trifluoromsthyl-1-oxopropyl)-4~4-di-methoxy-L-proline, Isomer .i and Isomer B
Each individual isomer product from Example 19 is hYdrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(3-mercapto-2-trifluoromethyl-l-oxopropyl)-4,4-dimethoxy-L-proline,isomer A and 1-(3-mercapto-2-trifluoro-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline, isomer B.
Example 21 [7(S),85]-7-(3-Mercapto-2-mercaptomethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid a) [7(S),8S]-7-~3-(Acetylthio)-2-(acetylthiomethyl)-l-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid Following the procedure of Example 1 but substituting D-2-acetylthiomethyl-3-acetylthiopro-pionyl chloride for the D-3-acetylthio-2-methylpropio~l chloride in part (e), one obtains ~7(S),8S]-7-~3-(acetylthio)-2-(acetylthiomethyl)-1-oxopropyl]-1,4-dioxo-7-azaspirol4.4]nonane-8-carboxylic acid.
b) [7(5),8(S)]-7-(3-Mercapto-2-mercaptomethyl-1-_~propy~ 4-dioxo-7-aza~ro[4~4inonan-e-8 carhoxvlic acid l'he product fro~:~ part (-~ is hydroLyzed with concentrated an~onia accordin~ to the pro~edure of Example 2 to yield [7(S),8S]-7-(3-mercapto-2-mercaptomethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro-. ~ ~ .
: ' ' ' , ~32985 HA18Oa ~4.4]nonane-8-carboxylic acid.
E~ample 2~
(S)-1-(3-Mercapto-2-merca~tomethyl-1-oxopropyl)-4,4-dimetho~y-L-proline a) (S)-1-~3-(.~cet~lthio)-2-(acetylthiomethyl)-1-oxopro-pyl~-4,4-dimethoxy-L-proline Following the procedure of Example 3 but substituting D-2-acetylthiomethyl-3-acetylthiopro-pionyl chloride for the D-3-acetylthio-2-methylpropionyl chloride in part (d), one obtains (S)-1-~3-(acetylthio~-2-(acetylthiomethyl)-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) (S)-1-(3-Mercapto-2-mercaptomethyl-1-oxopropyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield (S)-1-(3-mercapto-2-mercapto-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline.
Example 23 ~8S)-7-(3-MercaPto-2-methvlthio-l-oxopropyl)-l~4 dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid a) 3-(Acetylthio)-2-(meth~Ilthio)propionic acid 12.5 g. (0.094 mole) of methyl-2-~methylthio)-[prepared from methyl 2-chloroacrylate according to the procedure of Gundesmann et al., Chemische Berichte 94, 3254 (1916)] is stirred with lN
aqueous sodium hydroxide (94 ml.) with ice cooling.
The mixture is allowed to warm to ambient temperature, then stirred for five hours. The resulting solution is washed with ether, then acidified to p~ 2 with .
., : .
, .
.: - . . -.
., . : . .
HA180a concentrated hydrochloric acid. The solid precipitate i 5 extracted into methylene chloride, and the solution is washed with saturated sodium chloride and the solvent evaporated. The solid residue, 2-tmethylthio) acrylic acid; m.p. 70-75, is used immediateiy in the following reaction.
Equimolar amounts of 2-(methylthio)acrylic acid and thiolacetic acid are mixed under argon and stirred at 80 for several hours to yield 3-tacetylthio)-2-(methylthio~propionic acid.
b) 3-(Acetylthio)-2-~methylthio)propionic acid chloride The 3-(acetylthio)-2-(methylthio)propionic acid is refluxed in thionyl chloride for two hours. The reaction mixture is distilled to remove excess thionyl chloride and the product is distilled in vacuo to yield 3-(acetylthio)-2-(methylthio)propionic acid chloride.
c? (8S)-7-[3-(Acetylthio)-2-methylthio-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 3-(acetylthio)-2-(methylthio)propionic acid chloride according to the procedure of Example 1 (e) to yield (8S)-7-13-(acetylthio)-2-methylthio-1-oxopropyll-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
d) (8S)-7-(3-Mercapto-2-methylthio-1-oxopropyl)-1, 4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid The product from part (c) is treated with concentrated ammonia according to the procedure of Example 2 to yield (8S)-7-(3-mercapto-2-methylthio-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-,~
: , ~
: : ~ .:
. , . .:: ':
, . : ~-::
. . :
~ . ~ - - ~ : . ' : ., ~13Z985 HAl~Oa carboxylic acid.
Example 24 1-~3-Mercapto-2-methylthio-1-oxopropyl)-4,4-dimethoxy-L-proline S a) 1-~3-~Acetylthio)-2-methylthio-1-oxoDropyl]-4,4-dimethoxv-L-proline 4,4-Dimethoxy-L-proline is reacted with 3-(acetylthio)-2-(methylthio)propionic acid chloride according to the procedure or Example 3(d) to yield 10 1-[3-[aCetYlthi)-2-methylthio-l-oxopropyl]-4~4 dimethoxy-L-proline.
b) l-(3-Mercapto-2-methylthio-1-oxopropyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(3-mercapto-2-methylthio-1-oxo-propyl)-4,4-dimethoxy-L-proline.
Example 25 (85)-7-(3-~ercapto-1-oxopropyl)-1,4-dioxo-7-azaspiro-[4.4~nonane-8-carboxylic acid a) (8S)-7-[3-(Acetylthio)-l-oxopropyl]-1,4-dioxo-7-azas~iro r4 . 4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 3-acetylthiopropionyl chloride according to the procedure of Example 1 (e) to yield (8S)-7-[3-(acetyl-thio)-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
", .. . . . .. .
. ' .~, , ' '' ' ' , ; : . ' .
:' `. " ' ,' ' ~ ~
H~l 8 0 a b) (8S)-7-(3-Mercapto-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.41nonane-8-carboxylic acid The product ~rom part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield 18S)-7-(3-mercapto-1-oxopropyl)-1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid.
Example 26 1-(3-Mercapto-l-oxopropyl)-4,4-dimethoxy-L-proline a) l-[3-(Acetylthio)-l-oxopropyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with 3-acetylthiopropionyl chloride according to the procedure of Example 3 (d) to yield 1-[3-(acetylthio)-l-oxopropyl]-4,4-dimethoxy-L-proline.
b) 1-(3-Mercapto-l-oxopropyl)-4,4-dimethoxy-L-~roline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(3-mercapto-1-oxopropyl)-4,4-dimethoxy-L-proline.
Example 27 (85)-?-(4-MercaPto-l-oxobutyl)-1,4-dioxo-7-azas~iro~4.4]-nonane-8-carboxylic acid a) (8S)-7-[4-(Acetylthio)-l-oxobutyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 4-acetylthiobutyroyl chloride according to the procedure of Example 1 (e) to yield 8(S)-7-[4-(acetylthio)-l-oxobutyl]-1,4-dioxo-7-azaspiro[4.4]-nonane-8-carboxylic acid.
.
. , : .
-, `,'.: ;
, . .. ., , . . -. .. ~
.
113Z985 HA180a b) (8S)-7-~4-Mercapto-l-oxobutyl)-1,4-dioxo-7-aza-spiro~4,4~nonane-8-carboxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the pro-cedure of Example 2 to yield (8S)-7-(4-mercapto-1-oxobutyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 28 1-(4-Mercapto-l-oxobutyl)-4,4-dimethoxy-L-proline a) 1-[4-(Acetylthio)-l-oxobutyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with 4-acetylthiobutyroyl chloride according to the procedure of Example 3 (d) to yield 1-[4-(acetylthio)-1-oxobutyl]-4,4-dimethoxy-L-proline.
b) l-(4-Mercapto-l-oxobutyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(4-mercapto-1-oxobutyl)-4,4-dimethoxy-L-proline.
Example 29 (851-7-(2-Mercapto-l-oxoethyl)-1,4-dioxo-7-azaspiro-[4.4]nonane-8-carboxylic acid a) (8S)-7-[2-(Acetylthio)-l-oxoethyl]-1,4-dioxo-7-azaspiro[4.41nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with acetylthioacetyl chloride according to the procedure of Example 1 (e) to yield (8S)-7-~2-(acetylthio)-1-oxoethylJ-1,4-dioxo-7-azaspiro[4.41nonane-8-~, .,;
1132~5 H~180a carboxylic acid.
b) (8S)-7-(2-Mercapto-l-o~oethyl)-1,4-dioxo-7-azaspirot4.41nonane-~-carboxylic acid The product from part (a~ is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield (8S)-7-(2-mercapto-1-oxoethyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 30 1-(2-Mercapto-l-oxoethyl)-4,4-dimethoxy-L-proline a) 1-[2-(Acetylthio)-l-oxoethyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline i5 reacted with acetylthioacetyl chloride according to the procedure of Example 3 (d) to yield 1-[2-(acetylthio)-1-oxoethyl]-4,4-dimethoxy-L-proline.
b) l-(2-Mercapto-l-oxoethyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(2-mercapto-1-oxoethyl)-4,4-dimethoxy-L-proline.
Example 31 ( a s ) - 7-(3-Mercapto-2,2-dimethyl-1-oxopropyl)-1,4-dioxo-7-azaspirol4.4~nonane-8-carboxylic acid a) (8S)-7-[3-(Acetylthio)-2~2-dimethyl-l-oxopropYl]
1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 3-acetylthio-2,2-dimethylpropionyl chloride according : to the procedure of Example 1 (e) to yield ~8S)-7-13-(acetylthio)-2,2-dimethyl-1-oxopropy11-1,4-.
;
.
. .
.. . .
.. . . . - , .
HA18Oa -~6-dioxo-7-azaspiro[4.4~nonane-8-carboxylic acid.
b)( S)-7-(3-Mercapt^-2 2-dimethvl-1-oxo~ropyl)-1,4-dioxo-7-azaspiro~4.4~nonane-8-carboxylic acid The product from part (a) is hydrolyzed with S concentrated ammonia to yield (8S)-7-~3-mercapto-2,2-dimethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]-nonane-8-carboxylic acid.
Example 32 1-(3-Mercapto-2~2-dimethyl-l-oxopropyl)-4~4-dimeth L-proline a) l-[3-(Acetylthio~-2,2-dimethyl-1-oxopropyl~-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with 3-acetylthio-2,2-dimethylpropionyl chloride according to the procedure of Example 3 (d) to give 1-[3-(acetylthio)-2,2-dimethyl-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) 1-(3-Mercapto-2,2-dimethyl-1-oxopropyl)-4,4-. .
dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to give 1-(3-mercapto-2,2-dimethyl-1-oxopropyl)-4,4-dimethoxy-L-proline.
Example 33 17(s)~8s]-7-(3-Mercapto-2-ethyl-l-oxopropyl]-l~4 dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid a) [7(S),8S]-7-13-(Acetylthio)-2-ethyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with D-3-acetylthio-2-ethylpropionyl chloride according , .
-: .-... .
, ' ' HA180a to the procedure of Example 1 (e) to give ~1(5),8S~-7-[3-(acetylthio)-2-ethyl-1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid.
b) 17(S),8S]-7-(3-Mercapto-2-ethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to give [7(S),8S]-7-(3-mercapto-2-ethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid.
Example 34(S?-1-(3-Mercapto-2-ethyl-1-oxopropyl-4,4-dimethoxy-L-proline a) (S)-1-13-(Acetylthio)-2-ethyl-1-oxopropyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with D-3-acetylthio-2-ethylpropionyl chloride according to the procedure of Example 3 (d) to give (S)-1-[3-(acetyl-thio)-2-ethyl-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) (S)-1-(3-Mercapto-2-ethyl-1-oxopropyl)-4,4-dimethoxy-L-proline ~ he product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to give (5)-1-(3-mercap_o-2-ethyl-1-oxopropyl)-4,4-dimethoxy-L-proline.
~,. , . . , ~
~ , -. , 1~3Z985 HA180a Example 35 ~8S] -7-(3-Mercapto-2-trifluo_ometnYL-l-oxo-propyl)-7-aza-1,4-dithiaspiro[4.4lnonane-8-carboxylic acid a) 3-~[(4-Methoxy)phenylmethyl]thio]-2-trifluoro-meth 1 ro ionvl chloride Y P p A neat mixture of l-trifluoromethylacrylic acid (3.9 g.) and 4-methoxybenzylthiol (4.3 g.) is stirred at 100-110 for one hour. The mixture is allowed to cool to room temperature and the solid is recrystallized from cyclohexane to yield 3-~[(4-methoxy)phenylmethyllthio]-2-trifluoromethylpro-pionic acid; m.p. 72-74.
Treatment of this acid with thionyl chloride lS yields 3-[1(4-methoxy)phenylmethyl]thio]-2-trifluoro-methylpropionyl chloride.
b) [8S]-7-[3-~t(4-Methoxv)PhenvlmethYllthiol-2-trifluoromethyl-l-oxopropyl]-7-aza-1,4-dithiaspiro-[4.4]nonane-8-carboxylic acid The 3-[1(4-methoxy)phenylmethyl]thio]-2-trifluoromethyl propionyl chloride from part (a) is reacted with 4,4-ethylenedithio-L-proline according to the procedure of Example 9 (d) to yield [8S]-7-[3-[[(4-methoxy)phenylmethyllthio]-2-trifluoromethyl-1-oxopropyl]-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid.
c) [8S]-7-(3-Mercapto-2-trifluoromethyl-1--oxopropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carbox~lic acid The product from part (b) is mixed with tri-1132985 HA180a fluoroacetic acid and anisole under nitrogen. The solvents are removed under vacuum to yield as a ~esidue [8S]-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid.
Example 36 [8S]-7-(3-Mercapto-2-methylthio-1-o~opropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid a) 3-[~(4-Methoxy)phenylmethyl]thio]-2-methylthio-propionyl chloride 3-1[(4-Methoxy)phenylmethyl~thio]-2-methyl-thiopropanoic acid prepared according to the procedure of Example 10 in U.S. Patent 4,116,962 is treated with thionyl chloride to yield 3-[[(4-methoxy)phenylmethyl]-thio]-2-methylthiopropionyl chloride.
b) 18S]-7-~3-[[(4-Methoxy)phenylmethyl]thio]-2-methylthio-l-oxopropyl]-7-aza-1,4-dithiaspiro~4.4]-nonane-8-carboxylic acid The 3-[~(4-methoxy)phenylmethyl]thio]-2-methylthiopropionyl chloride from part (a) is reacted with 4,4-ethylenedithio-L-proline according to the procedure of Example 9 (d) to yield [8S]-7-[3-l~(4-methoxy)phenylmethyl]thio]-2-methylthi oxopropyl]-7-aza-1,4-dithiaspiro~4.4]nonane-8-carboxylic acid.
c) [8Sl-7-(3-Mercapto-2-methylthio-1-oxo-propyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid The product from part (b) is mixed with tri-fluoroacetic acid and anisole under nitrogen. The , ,, , ;~ - .
~, ' ;' '. -: - ': ~ -.:. ::
Y.A180a solvents are removed under vacuum to yield as a residue ~8S]-7-(3-mercapto-2-methylthio-1-oxo-propyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid.
Example 37 [7(S),8S]-7-(3-Mercapto-3-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid a) ~7(S),8S~-7-~3-(Acetylthio)-3-methyi-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with D-3-acetylthio-3-methylpropionyl chloride according to the procedure of Example 1 (e) to yield ~7(S~,8S~-7-[3-(acetylthio)-3-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid.
b) [7(S),8S]-7-(3-Mercapto-3-methyl-1-oxopropyl)-1, 4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid The product from part (a) is h~drolyzed with concentrated ammonia according to the procedure of Example 2 to gi~e [7(S),8S]-7-(3-mercapto-3-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 38 (S)-1-(3-Mercapto-3-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline a) (S)-1-[3-(Acetylthio)-3-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with D-3-acetylthio-3-methylpropionyl chloride according to the procedure of Example 3 (d) to yield (S)-1-[3-(acetyl-.:
. .
.
' ~ ;' .:
1~3Z985 HA180a thio)-3-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) (S?-1-(3-Mercapto-3-methyl-1-oxopropyl-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield (S)-1-(3-mercapto-3-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline.
Example 39 1-(3-Mercapto-l-oxopropyl)-4,4-dimethylthio-L-proline a) 4-Keto-L-proline, hydrobromide To 4.0 g. (0.015 mole) of N-carbobenzyloxy-4-keto-L-proline are added 20 ml. of hydrogen bromide in acetic acid (30-32%). The mixture is frequently swirled over a period of eight minutes. At the end of this period (effervescence has stopped), the yellow-orange solution is layered over with 25 of ether, triturating the gummy product. The ether is discarded and the resulting tacky solid is triturated with fresh ether and finally with 50 ml. of acetoni-trile to give 4-keto-L-proline, hydrobromide as a crystalline solid weighing 2.7 g. (85%), m.p.
153-155 (dec.,), ta]26 -49 (c, 1% in water).
b) l-t3-(Acetylthio-l-oxopropyl]-4-oxo-L-proline A stirred solution of 4.1 g. (0.0195 mole) of 4-keto-L-proline, hydrobromide in 50 ml. of water is cooled to 5 and treated portionwise with solid sodium carbonate (foaming is controlled by adding a few drops of ether) to pH 8.0 (approx. 2 g. required).
Then while continuing stirring and cooling, a solution of 3.5 g. (0.012 mole) of 3-acetylthiopropanoyl chloride ., ~ .
" ` 113Z~S
HA180a in 5 ml. of ethyl acetate is added portionwise by means of a pipette while maintaining the p~ at 7.0 -8.0 by dropwise addition of 25% (w/v) sodium carbonate solution (about 10 ml.~. After about 10 minutes the pH stabilizes at 8.0 - 8.4. After continued stirring and cooling for a total of 1 hour, the solution is washed with ethyl acetate (2 x 50 ml.), layered over with 50 ml. of ethyl acetate, stirred, cooled, acidified carefully with concentrated hydrochloric acid to pH 2.0, saturated with sodium chloride, and the layers are separated. The a~ueous phase is extracted with additional ethyl acetate (3 x 50 ml.), the combined organic layers dried (MgSO4) and the solvent evaporated, finally at 0.2 mm. to give 4.8 g.
of a yellow-orange glass-like residue. This residue is dissolved in 35 ml. of ethyl acetate and treated with a solution of 3.5 g. of dicyclohexylamine in 5 ml. of ethyl acetate. On seeding and rubbing, - crystalline 1-[3-(acetylthio-1-oxopropyl)]-4-oxo-L-proline dicyclohexylamine salt separated, weight after cooling overnight, 2.7 g. (nearly colorless), m.p.
191-193 (dec.), Ea]26 -24 (c, 1~ in CHC13).
This dicyclohexylamine salt is converted to the free acid using potassium bisulfate as described in Example 1 (e) to give 3.7 g. of 1-~3-(acetylthio)-1-oxopropyl~-4-oxo-L-proline as a pale yellow glass-like solid.
c) 1-[3-(Acetvlthio)-l-oxopropyl]-4,4-dimethylthio-L-.
proline The 1-[3-(acetylthio)-1-oxopropyl]-4-oxo-L-113Z9~ ~18Oa
of ethyl acetate with l.S g. of dicyclohexylamine to give 3.0 g. of colorless dicyclohexylamine salt;
m.p. 176-178 (s, 170 ); [a]D ~55 (C~ 1~ in ethanol). This material is ground in a mortar under lS ml. of acetonitrile, cooled for one hour, filtered, washed with 5 ml. of cold acetonitrile and with ether, and dried to give 2.9 g. of dicyclohexylamine salt; m.p. 177-179 (s, 172); 1~26 56 in ethanol).
Anal. Calc d 13 19 4 12 23 C, 56.56; H, 7.98; N, 5.28; S, 18.12 Found: C, 56.21; H, 8.18; ~I, 5.05; S, 18.00.
The above dicyclohexylamine salt is converted to the free acid by suspending 2.8 g. in 30 ml. of ethyl acetate, cooling, and treating with 30 ml. of 10~
potassium bisulfate to give two clea~r layers. After separating, the aqueous phase is extracted with ethyl acetate (3 x 30 ml.), the combined organic layers dried (MgSO4), and the solvent evaporated, finally at 0.1 -0.2 mm and 45, to give 2.0 g.
(63%) of colorless solid f7(S),8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyll-7-aza-1,4-dithiaspiro f 4.4] -nonane-8-carboxylic acid, m.p., 125-126 (S, 122);
- 1]D6 -101 (C, 1~ in ethanol).
, . :' ,.~` -` 1132985 H~180a Example 10 ~7(S),8S]-7-(3-Mercapto-2-methyl-1-oxo~ropyl)-7-aza-1,4-dithiaspiro~4.4~nonane-8-carbo~ylic acid Argon is passed through a cold solution of 3.5 ml. of concentrated ammonia in 8.5 ml. of water for lS minutes. The latter is then added while cooling and under a blanket of argon to 1.9 g.
(0.0054 mole) of [7(S),8S~-7-[3-(acetylthio)-2-methyl-l-oxopropyl]-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid and ~he mixture is swirled in an ice-bath until a solution is obtained. Stirring under argon is continued at room temperature for an additional two hours, then the solution is extracted with 15 ml. of ethyl acetate under an argon atmosphere. The aqueous layer is cooled, stirred, layered over with 15 ml. of ethyl acetate, and acidified portionwise with approximately 6.5 ml.
of 1:1 hydrochloric acid. The layers are separated, the aqueous phase extracted with additional ethyl acetate (3 x 15 ml.), the combined acetate layers dried (MgSO ), and the solvent evaporated to give a glass-like residue which solidifies when rubbed under ether. The evaporation is repeated and the colorless product is suspended in 30 ml. of hexane, filtered and dried in vacuo to give 1.4 g. (84~) of [7~5),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-7-aza-1,4-dithiaspirot4.4]nonane-8-carboxylic acid;
m.p. 116-118 (s, 105); [a]26 -44 (c, 1% in ethanol).
Anal. Calc'd. for C11~17NO3S3:
:
~-HA180a C, 42.97; ~, 5.5~; N, 4.56; S, 31.29; SH, 100~
Found: C, 42.70, H, 5.71; N, 4.54; S, 31.16; SH, 100%.
Example 11 [7(S)r8S3-7-(3-Mercapto-2-methyl-1-oxopropYl)-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid a) [7(S),8S~-7-[3-(~cetylthio)-2-methyl-1-oxopropyl~-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid Following the procedure of Example 1 but sub-stituting an equivalent amount of N-carbobenzyloxy-5-keto-L-pipecolic acid for the N-carbobenzyloxy-4-keto-L-proline in part (c) and then following the procedure of parts (d) and (e) one obtains, [7(S),8 ~-7-~3-(acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid.
b) ~7(S)!8S]-7-(3-Mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.5]decane-8-carboxylic acid.
Example 12 [l(S),2s]-1-(3-Mercapto-2-methyl-1-oxopropyl)-5,5-dimethoxy-2-piperidinecarboxylic ~cid a) [l(S),2S]-1-[3-(Acetylthio-2-methyl-l-oxopropyl]-5,5-dimethoxy-2-piperidinecarboxylic acid Following the procedure of Example 3 but substituting an equivalent amount of N-carbobenzyloxy-5-keto-Lopipecolic acid for the N-carbobenzyloxy-4-keto-L-proline in part (a) one obtains [l~S),25l-1-~, ~
~13Z985 HAl~Oa t3-(acetylthio)-2-methyl-1-oxopropyl3-5,s-dimethoxy-2-piperidinecarboxylic acid.
b) ll(S),2S]-1-(3-Mercapto-2-methyl-1-oxopropyl)-5,5-dimethoxy-2-piperidinecarboxylic acid The product from part ~a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield [l(S),2S]-1-(3-mercapto-2-methyl-l-oxopropyl)-5,5-dimethoxy-2-piperidinecarboxylic acid.
Example 13 [l(S),2-1-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-2-piperidinecarboxylic acid a) [l(S),2-]-1-[3-(Acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-2-piperidinecarboxylic acid Following the procedure of Example 3 but substituting an equivalent amount of N-carbobenzyloxy-4-keto-2-pipecolic acid for the N-carbobenzyloxy-4-keto-L-proline in part (a) one obtains [l(S),2-]-1-13-(acetylthio)-2-methyl-1-oxopropyll-4,4-diethoxy-2-piperidinecarboxylic acid.
b) [l(S),2-]-1-[3-Mercapto-2-methyl-1-oxopropyl)-4, 4-dimethoxy-2-piperidinecarboxylic acid - The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield [l(S),2-]-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-2-piperidinecarboxylic acid.
, .
113298~ HAl 8 0 a Example 14 [2(S),3S]-2-(3-Mercapto-2-methyl-1-oxopropyl)-6,10-di-thia-2-azaspiro~4.5]decane-3-carboxvlic acid a) [2(S),3S]-2-~3-(Acetylthio)-2-methyl-l-oxopropyl)-6,10-dithia-2-azaspiro[4.5~decane-3-carboxy-lic acid Following the procedure of Example 9 but substituting 1,3-propanedithiol for the ethanedithiol in part (a), one obtains [2(S),3S]-2-[3-(acetylthio)-2-methyl-1-oxopropyl~-6,10-dithio-2-azaspiro[4.5~decane-3-carboxylic acid.
b) [2(S),3S~-2-(3-Mercapto-2-methyl-1-oxoProPvl)-6,10-dithia-2-azaspiro~4.5~decane-3-carboxylic acid The product from part (a) is hydrolyzed lS with concentrated ammonia according to the proced~re of Example 10 to yield [2(S),3S~-2-(3-mercapto-2-methyl-l-oxopropyl)-6,10-dithia-2-azaspiro[4.5~decane-3-carboxylic acid.
Example 15 [7~S),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1-oxo-4-thia-7-azaspiro[4.4~nonane-8-carboxylic acid a) [7(S),8S]-7-[3-(Acetylthio)-2-methyl-1-oxoproPyl]-l-oxo-4-thia-7-azaspiro[4.4]nonane-8-carboxylic acid Following the procedure of Example 1 but substituting 2-mercaptoethanol for the ethylene glycol in part (c), one obtains [7(S).8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyl]-1-oxo-4-thia-7-azaspiro[4.4]nonane-8-carboxylic acid.
- , , ` ~ ' - ~`
~i32985 H~180a b) [7~S),8S]-7-(3-Mercapto-2-methYl-l-oxopropYl)-l-oxo-4-thia-7-azaspiro~4.4]nonane-8-c~rbo~ylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure S of Example 2 to yield [7(S),85]-7-(3-mercapto-2-methyl-1-oxopropyl)-1-oxo-~-thia-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 16 (8S)-7-[3-(Acetylthio)-2-trifluoromethyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4~nonane-8-carboxylic acid (Isomers A and ~) a) D,L-3-(Acetylthio)-2-trifluoromethylpropionic acid a-Trifluoromethyl acrylic acid (10 g., 0.071 mole) ~prepared according to the procedure set forth J. Chem. Soc., 1954, p. 371] is cooled in a salt-ice-water bath, stirred and treated portionwise with 5.7 ml. (0.075 mole) of 97% thiolacetic acid.
After the addition, the yellow liquid is stirred in the cold for one hour, allowed to warm to room temperature, and distilled to yield 14 g. (91%) of D,L-3-(acetylthio)-2-trifluoromethylpropionic acid as a light yellow oil, b.p. 149-153/13 mm. The material solidifies on storing in the cola.
b) D,~-3-(Acetylthio)-2-trifluoromethylpropionyl chloride The D,L-3-(acetylthio)-2-trifluoromethyl-propionyl acid (7 g., 0.032 mole) is treated with 18 ml. (0.25) of redistilled thionyl chloride and the mixture is refluxed for three hours. After ,:
. --H.~l8oa removing the excess thionyl chloride on a rotary evaporator, the residue is distilled to give 6.8 g.
of D,L-3-(acetylthio)-2-trifluoromethylpropionyl chloride as a pale yellow oil; b.p. 80-82/16 mm.
c) (8S)-7-[3-(Acetylthio)-2-trifluoromethyl-1-oxopropy~ 4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid (Isomers A and B) .
4,4-Ethylenedioxy-L-proline (2.4 g., 0.014 mole) is reacted with 3.4 g. (0.014 mole) of D.L-3-(acetylthio)-2-trifluoromethylpropionyl chloride in 40 ml. of water in the presence of sodium carbonate according to the procedure of Example 1 (e) to yield 4.5 g. of nearly colorless solid product; m.p.
126-145 (s. 115 ), [a~D -34 (c, 1~ in ethanol).
The mixture of diastereoisomers (4.2 g.) is suspended in 45 ml. of ether, stirred for two hours, cooled for 20 minutes, and the undissolved solid is filtered, washed with cold ether, and air dried to yield 2.7 g. of product; m.p. 166-172 (s. 140 ), ~al25 -62 (c, 13 in ethanol). The material is then ground in a mortar under 25 ml. of ether, filtered after 15 minutes, washed with some ether, and again air-dried to yield 2.1 g. of product; m.p. 172-177 (s. 143). Following crystallization from 11 ml. of boiling isopropanol and cooling overnight, -1.55 g. of colorless (8S)-7-[3-(acetylthio)-2-trifluoromethyl-l-oxopropyl]-1,4-dioxo-7-azaspir~-~4.4]-nonane-8-carboxylic acid, isomer A is obtained; m.p.
192-194 (s, 183), [~25 -32 tc, 1% in ethanol).
I 3~ A sample is recrystaLlized from isopropanol~ m.p.
. .
, .
-' ~ ' ,--- ' ~
9 ~ HA18Oa 193-195 ~s, 184), ta]D -134 (c, 1% in ethanol).
Isomer ~ is obtained by combining the above ether and isopropanol filtrates and removing the solvents under reduced pressure to give S 2.2 g. of a pale yellow solid; m.p. 108-109 ~5, 95 ); [a]25 + 30 (c, l~ in ethanol). This material is purified by crystallization from 6 ml.
of isopropanol to give 1.2 g. of nearly colorless solid; m.p. 153-155 (s, 130?, [a]25 +40 (c, 1% in ethanol). After crystallization from 4 ml. of ethyl acetate -6 ml. of hexane, 1.1 g. of (8S)-7-[3-(acetylthio)-2-trifluoromethyl-l-oxopropyl]-1,4-dioxo-7-aza-spiro[4.4lnonane-8-carboxylic acid, isomer B; m.p.
lS 153-lSS (s, 141), ~a]25 +41 (c, 1% in ethanol) is obtained.
Example 17 (8S)-7-(3-Mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, Isomer A
Isomer A product from Example 16 (1.45 g., 0.0039 mole) is hydrolyzed with 2.5 ml. of concentrated ammonia in 6 ml. of water over a period of one hour as described in Example 2 to yield 1.25 g. ~97%) of colorless ~8S)-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, isomer A, as a glass-like product, [a]D -61 (c, 1% in ethanol). TLC:Rf 0.40 (95:5:5 methylene chloride -methanol - acetic acid;
vis. SH reagent, PMA and heat).
.
- . .
:, . . ;
. .
. ~
1~3Z985 HA180a -4~-Anal. Calc'd. for CllHl~F3NOss:
C, 40.12; H, 4.28; N, 4.25; 5, 9.74; F, 17.31 Found: C, 40.10, H, 4.43; N, 4.51; S, 9.63; F, 17.10.
The above acid is dissolved in ethyl acetate and treated with l-adamantanamine to yield ~he 1-adamantanamine salt; m.p. 213-215 (dec.), [al25 -47 c, 1% in methanol).
Example 18 (8S)-7-(2-Mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-c2rboxylic acid, Isomer B
Isomer B product from Example 16 (1.05 g., 0.0028 mole) is hydrolyzed with 2 ml. of concentrated ammonia in S ml. of water according to the procedure described in Example 2 to yield 0.9 g. (97~) of (8S)-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, Isomer B as a pale yellow viscous syrup,; [a]D5 -16 (c, 1~ in ethanol).
The material sets to a waxy solid;m.p.61-64 (s .SS ) Anal. Calc d- for: 11 14 3 S 2 C, 39.5,8; H, 4.38; N, 4.20; S, 9.61; F, 17.01 Found: C, 39.60; H, 4.28; ~, 4.26; S, 9.62; F, 16.89.
Example 19 1-~3-(Acet~lthio)-2-trifluoromethyl-1-oxopropyl]-4,4-dimethoxy-L-proline, Isomers A and B
Following the procedure of Example 16 but substituting 4,4-dimethoxy-L-proline for the 4,4-ethylenedioxy-L-proline in part (c), one obtains 1-[3-(acetylthio)-2-trifluoromethyl-1-oxopropyl]-4,4-dimethoxy-L-proline as a racemic mixture. The ~13Z98S
HAl~Oa _aa_ individual isoners can be separated as taught in Example 16.
Example 2~
1-(3-Mercapto-2-trifluoromsthyl-1-oxopropyl)-4~4-di-methoxy-L-proline, Isomer .i and Isomer B
Each individual isomer product from Example 19 is hYdrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(3-mercapto-2-trifluoromethyl-l-oxopropyl)-4,4-dimethoxy-L-proline,isomer A and 1-(3-mercapto-2-trifluoro-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline, isomer B.
Example 21 [7(S),85]-7-(3-Mercapto-2-mercaptomethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid a) [7(S),8S]-7-~3-(Acetylthio)-2-(acetylthiomethyl)-l-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid Following the procedure of Example 1 but substituting D-2-acetylthiomethyl-3-acetylthiopro-pionyl chloride for the D-3-acetylthio-2-methylpropio~l chloride in part (e), one obtains ~7(S),8S]-7-~3-(acetylthio)-2-(acetylthiomethyl)-1-oxopropyl]-1,4-dioxo-7-azaspirol4.4]nonane-8-carboxylic acid.
b) [7(5),8(S)]-7-(3-Mercapto-2-mercaptomethyl-1-_~propy~ 4-dioxo-7-aza~ro[4~4inonan-e-8 carhoxvlic acid l'he product fro~:~ part (-~ is hydroLyzed with concentrated an~onia accordin~ to the pro~edure of Example 2 to yield [7(S),8S]-7-(3-mercapto-2-mercaptomethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro-. ~ ~ .
: ' ' ' , ~32985 HA18Oa ~4.4]nonane-8-carboxylic acid.
E~ample 2~
(S)-1-(3-Mercapto-2-merca~tomethyl-1-oxopropyl)-4,4-dimetho~y-L-proline a) (S)-1-~3-(.~cet~lthio)-2-(acetylthiomethyl)-1-oxopro-pyl~-4,4-dimethoxy-L-proline Following the procedure of Example 3 but substituting D-2-acetylthiomethyl-3-acetylthiopro-pionyl chloride for the D-3-acetylthio-2-methylpropionyl chloride in part (d), one obtains (S)-1-~3-(acetylthio~-2-(acetylthiomethyl)-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) (S)-1-(3-Mercapto-2-mercaptomethyl-1-oxopropyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield (S)-1-(3-mercapto-2-mercapto-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline.
Example 23 ~8S)-7-(3-MercaPto-2-methvlthio-l-oxopropyl)-l~4 dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid a) 3-(Acetylthio)-2-(meth~Ilthio)propionic acid 12.5 g. (0.094 mole) of methyl-2-~methylthio)-[prepared from methyl 2-chloroacrylate according to the procedure of Gundesmann et al., Chemische Berichte 94, 3254 (1916)] is stirred with lN
aqueous sodium hydroxide (94 ml.) with ice cooling.
The mixture is allowed to warm to ambient temperature, then stirred for five hours. The resulting solution is washed with ether, then acidified to p~ 2 with .
., : .
, .
.: - . . -.
., . : . .
HA180a concentrated hydrochloric acid. The solid precipitate i 5 extracted into methylene chloride, and the solution is washed with saturated sodium chloride and the solvent evaporated. The solid residue, 2-tmethylthio) acrylic acid; m.p. 70-75, is used immediateiy in the following reaction.
Equimolar amounts of 2-(methylthio)acrylic acid and thiolacetic acid are mixed under argon and stirred at 80 for several hours to yield 3-tacetylthio)-2-(methylthio~propionic acid.
b) 3-(Acetylthio)-2-~methylthio)propionic acid chloride The 3-(acetylthio)-2-(methylthio)propionic acid is refluxed in thionyl chloride for two hours. The reaction mixture is distilled to remove excess thionyl chloride and the product is distilled in vacuo to yield 3-(acetylthio)-2-(methylthio)propionic acid chloride.
c? (8S)-7-[3-(Acetylthio)-2-methylthio-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 3-(acetylthio)-2-(methylthio)propionic acid chloride according to the procedure of Example 1 (e) to yield (8S)-7-13-(acetylthio)-2-methylthio-1-oxopropyll-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
d) (8S)-7-(3-Mercapto-2-methylthio-1-oxopropyl)-1, 4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid The product from part (c) is treated with concentrated ammonia according to the procedure of Example 2 to yield (8S)-7-(3-mercapto-2-methylthio-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-,~
: , ~
: : ~ .:
. , . .:: ':
, . : ~-::
. . :
~ . ~ - - ~ : . ' : ., ~13Z985 HAl~Oa carboxylic acid.
Example 24 1-~3-Mercapto-2-methylthio-1-oxopropyl)-4,4-dimethoxy-L-proline S a) 1-~3-~Acetylthio)-2-methylthio-1-oxoDropyl]-4,4-dimethoxv-L-proline 4,4-Dimethoxy-L-proline is reacted with 3-(acetylthio)-2-(methylthio)propionic acid chloride according to the procedure or Example 3(d) to yield 10 1-[3-[aCetYlthi)-2-methylthio-l-oxopropyl]-4~4 dimethoxy-L-proline.
b) l-(3-Mercapto-2-methylthio-1-oxopropyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(3-mercapto-2-methylthio-1-oxo-propyl)-4,4-dimethoxy-L-proline.
Example 25 (85)-7-(3-~ercapto-1-oxopropyl)-1,4-dioxo-7-azaspiro-[4.4~nonane-8-carboxylic acid a) (8S)-7-[3-(Acetylthio)-l-oxopropyl]-1,4-dioxo-7-azas~iro r4 . 4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 3-acetylthiopropionyl chloride according to the procedure of Example 1 (e) to yield (8S)-7-[3-(acetyl-thio)-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
", .. . . . .. .
. ' .~, , ' '' ' ' , ; : . ' .
:' `. " ' ,' ' ~ ~
H~l 8 0 a b) (8S)-7-(3-Mercapto-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.41nonane-8-carboxylic acid The product ~rom part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield 18S)-7-(3-mercapto-1-oxopropyl)-1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid.
Example 26 1-(3-Mercapto-l-oxopropyl)-4,4-dimethoxy-L-proline a) l-[3-(Acetylthio)-l-oxopropyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with 3-acetylthiopropionyl chloride according to the procedure of Example 3 (d) to yield 1-[3-(acetylthio)-l-oxopropyl]-4,4-dimethoxy-L-proline.
b) 1-(3-Mercapto-l-oxopropyl)-4,4-dimethoxy-L-~roline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(3-mercapto-1-oxopropyl)-4,4-dimethoxy-L-proline.
Example 27 (85)-?-(4-MercaPto-l-oxobutyl)-1,4-dioxo-7-azas~iro~4.4]-nonane-8-carboxylic acid a) (8S)-7-[4-(Acetylthio)-l-oxobutyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 4-acetylthiobutyroyl chloride according to the procedure of Example 1 (e) to yield 8(S)-7-[4-(acetylthio)-l-oxobutyl]-1,4-dioxo-7-azaspiro[4.4]-nonane-8-carboxylic acid.
.
. , : .
-, `,'.: ;
, . .. ., , . . -. .. ~
.
113Z985 HA180a b) (8S)-7-~4-Mercapto-l-oxobutyl)-1,4-dioxo-7-aza-spiro~4,4~nonane-8-carboxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the pro-cedure of Example 2 to yield (8S)-7-(4-mercapto-1-oxobutyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 28 1-(4-Mercapto-l-oxobutyl)-4,4-dimethoxy-L-proline a) 1-[4-(Acetylthio)-l-oxobutyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with 4-acetylthiobutyroyl chloride according to the procedure of Example 3 (d) to yield 1-[4-(acetylthio)-1-oxobutyl]-4,4-dimethoxy-L-proline.
b) l-(4-Mercapto-l-oxobutyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(4-mercapto-1-oxobutyl)-4,4-dimethoxy-L-proline.
Example 29 (851-7-(2-Mercapto-l-oxoethyl)-1,4-dioxo-7-azaspiro-[4.4]nonane-8-carboxylic acid a) (8S)-7-[2-(Acetylthio)-l-oxoethyl]-1,4-dioxo-7-azaspiro[4.41nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with acetylthioacetyl chloride according to the procedure of Example 1 (e) to yield (8S)-7-~2-(acetylthio)-1-oxoethylJ-1,4-dioxo-7-azaspiro[4.41nonane-8-~, .,;
1132~5 H~180a carboxylic acid.
b) (8S)-7-(2-Mercapto-l-o~oethyl)-1,4-dioxo-7-azaspirot4.41nonane-~-carboxylic acid The product from part (a~ is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield (8S)-7-(2-mercapto-1-oxoethyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 30 1-(2-Mercapto-l-oxoethyl)-4,4-dimethoxy-L-proline a) 1-[2-(Acetylthio)-l-oxoethyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline i5 reacted with acetylthioacetyl chloride according to the procedure of Example 3 (d) to yield 1-[2-(acetylthio)-1-oxoethyl]-4,4-dimethoxy-L-proline.
b) l-(2-Mercapto-l-oxoethyl)-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield 1-(2-mercapto-1-oxoethyl)-4,4-dimethoxy-L-proline.
Example 31 ( a s ) - 7-(3-Mercapto-2,2-dimethyl-1-oxopropyl)-1,4-dioxo-7-azaspirol4.4~nonane-8-carboxylic acid a) (8S)-7-[3-(Acetylthio)-2~2-dimethyl-l-oxopropYl]
1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with 3-acetylthio-2,2-dimethylpropionyl chloride according : to the procedure of Example 1 (e) to yield ~8S)-7-13-(acetylthio)-2,2-dimethyl-1-oxopropy11-1,4-.
;
.
. .
.. . .
.. . . . - , .
HA18Oa -~6-dioxo-7-azaspiro[4.4~nonane-8-carboxylic acid.
b)( S)-7-(3-Mercapt^-2 2-dimethvl-1-oxo~ropyl)-1,4-dioxo-7-azaspiro~4.4~nonane-8-carboxylic acid The product from part (a) is hydrolyzed with S concentrated ammonia to yield (8S)-7-~3-mercapto-2,2-dimethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]-nonane-8-carboxylic acid.
Example 32 1-(3-Mercapto-2~2-dimethyl-l-oxopropyl)-4~4-dimeth L-proline a) l-[3-(Acetylthio~-2,2-dimethyl-1-oxopropyl~-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with 3-acetylthio-2,2-dimethylpropionyl chloride according to the procedure of Example 3 (d) to give 1-[3-(acetylthio)-2,2-dimethyl-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) 1-(3-Mercapto-2,2-dimethyl-1-oxopropyl)-4,4-. .
dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to give 1-(3-mercapto-2,2-dimethyl-1-oxopropyl)-4,4-dimethoxy-L-proline.
Example 33 17(s)~8s]-7-(3-Mercapto-2-ethyl-l-oxopropyl]-l~4 dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid a) [7(S),8S]-7-13-(Acetylthio)-2-ethyl-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with D-3-acetylthio-2-ethylpropionyl chloride according , .
-: .-... .
, ' ' HA180a to the procedure of Example 1 (e) to give ~1(5),8S~-7-[3-(acetylthio)-2-ethyl-1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid.
b) 17(S),8S]-7-(3-Mercapto-2-ethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to give [7(S),8S]-7-(3-mercapto-2-ethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid.
Example 34(S?-1-(3-Mercapto-2-ethyl-1-oxopropyl-4,4-dimethoxy-L-proline a) (S)-1-13-(Acetylthio)-2-ethyl-1-oxopropyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with D-3-acetylthio-2-ethylpropionyl chloride according to the procedure of Example 3 (d) to give (S)-1-[3-(acetyl-thio)-2-ethyl-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) (S)-1-(3-Mercapto-2-ethyl-1-oxopropyl)-4,4-dimethoxy-L-proline ~ he product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to give (5)-1-(3-mercap_o-2-ethyl-1-oxopropyl)-4,4-dimethoxy-L-proline.
~,. , . . , ~
~ , -. , 1~3Z985 HA180a Example 35 ~8S] -7-(3-Mercapto-2-trifluo_ometnYL-l-oxo-propyl)-7-aza-1,4-dithiaspiro[4.4lnonane-8-carboxylic acid a) 3-~[(4-Methoxy)phenylmethyl]thio]-2-trifluoro-meth 1 ro ionvl chloride Y P p A neat mixture of l-trifluoromethylacrylic acid (3.9 g.) and 4-methoxybenzylthiol (4.3 g.) is stirred at 100-110 for one hour. The mixture is allowed to cool to room temperature and the solid is recrystallized from cyclohexane to yield 3-~[(4-methoxy)phenylmethyllthio]-2-trifluoromethylpro-pionic acid; m.p. 72-74.
Treatment of this acid with thionyl chloride lS yields 3-[1(4-methoxy)phenylmethyl]thio]-2-trifluoro-methylpropionyl chloride.
b) [8S]-7-[3-~t(4-Methoxv)PhenvlmethYllthiol-2-trifluoromethyl-l-oxopropyl]-7-aza-1,4-dithiaspiro-[4.4]nonane-8-carboxylic acid The 3-[1(4-methoxy)phenylmethyl]thio]-2-trifluoromethyl propionyl chloride from part (a) is reacted with 4,4-ethylenedithio-L-proline according to the procedure of Example 9 (d) to yield [8S]-7-[3-[[(4-methoxy)phenylmethyllthio]-2-trifluoromethyl-1-oxopropyl]-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid.
c) [8S]-7-(3-Mercapto-2-trifluoromethyl-1--oxopropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carbox~lic acid The product from part (b) is mixed with tri-1132985 HA180a fluoroacetic acid and anisole under nitrogen. The solvents are removed under vacuum to yield as a ~esidue [8S]-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid.
Example 36 [8S]-7-(3-Mercapto-2-methylthio-1-o~opropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid a) 3-[~(4-Methoxy)phenylmethyl]thio]-2-methylthio-propionyl chloride 3-1[(4-Methoxy)phenylmethyl~thio]-2-methyl-thiopropanoic acid prepared according to the procedure of Example 10 in U.S. Patent 4,116,962 is treated with thionyl chloride to yield 3-[[(4-methoxy)phenylmethyl]-thio]-2-methylthiopropionyl chloride.
b) 18S]-7-~3-[[(4-Methoxy)phenylmethyl]thio]-2-methylthio-l-oxopropyl]-7-aza-1,4-dithiaspiro~4.4]-nonane-8-carboxylic acid The 3-[~(4-methoxy)phenylmethyl]thio]-2-methylthiopropionyl chloride from part (a) is reacted with 4,4-ethylenedithio-L-proline according to the procedure of Example 9 (d) to yield [8S]-7-[3-l~(4-methoxy)phenylmethyl]thio]-2-methylthi oxopropyl]-7-aza-1,4-dithiaspiro~4.4]nonane-8-carboxylic acid.
c) [8Sl-7-(3-Mercapto-2-methylthio-1-oxo-propyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid The product from part (b) is mixed with tri-fluoroacetic acid and anisole under nitrogen. The , ,, , ;~ - .
~, ' ;' '. -: - ': ~ -.:. ::
Y.A180a solvents are removed under vacuum to yield as a residue ~8S]-7-(3-mercapto-2-methylthio-1-oxo-propyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid.
Example 37 [7(S),8S]-7-(3-Mercapto-3-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid a) ~7(S),8S~-7-~3-(Acetylthio)-3-methyi-1-oxopropyl]-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 4,4-Ethylenedioxy-L-proline is reacted with D-3-acetylthio-3-methylpropionyl chloride according to the procedure of Example 1 (e) to yield ~7(S~,8S~-7-[3-(acetylthio)-3-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid.
b) [7(S),8S]-7-(3-Mercapto-3-methyl-1-oxopropyl)-1, 4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid The product from part (a) is h~drolyzed with concentrated ammonia according to the procedure of Example 2 to gi~e [7(S),8S]-7-(3-mercapto-3-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
Example 38 (S)-1-(3-Mercapto-3-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline a) (S)-1-[3-(Acetylthio)-3-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline 4,4-Dimethoxy-L-proline is reacted with D-3-acetylthio-3-methylpropionyl chloride according to the procedure of Example 3 (d) to yield (S)-1-[3-(acetyl-.:
. .
.
' ~ ;' .:
1~3Z985 HA180a thio)-3-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline.
b) (S?-1-(3-Mercapto-3-methyl-1-oxopropyl-4,4-dimethoxy-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield (S)-1-(3-mercapto-3-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline.
Example 39 1-(3-Mercapto-l-oxopropyl)-4,4-dimethylthio-L-proline a) 4-Keto-L-proline, hydrobromide To 4.0 g. (0.015 mole) of N-carbobenzyloxy-4-keto-L-proline are added 20 ml. of hydrogen bromide in acetic acid (30-32%). The mixture is frequently swirled over a period of eight minutes. At the end of this period (effervescence has stopped), the yellow-orange solution is layered over with 25 of ether, triturating the gummy product. The ether is discarded and the resulting tacky solid is triturated with fresh ether and finally with 50 ml. of acetoni-trile to give 4-keto-L-proline, hydrobromide as a crystalline solid weighing 2.7 g. (85%), m.p.
153-155 (dec.,), ta]26 -49 (c, 1% in water).
b) l-t3-(Acetylthio-l-oxopropyl]-4-oxo-L-proline A stirred solution of 4.1 g. (0.0195 mole) of 4-keto-L-proline, hydrobromide in 50 ml. of water is cooled to 5 and treated portionwise with solid sodium carbonate (foaming is controlled by adding a few drops of ether) to pH 8.0 (approx. 2 g. required).
Then while continuing stirring and cooling, a solution of 3.5 g. (0.012 mole) of 3-acetylthiopropanoyl chloride ., ~ .
" ` 113Z~S
HA180a in 5 ml. of ethyl acetate is added portionwise by means of a pipette while maintaining the p~ at 7.0 -8.0 by dropwise addition of 25% (w/v) sodium carbonate solution (about 10 ml.~. After about 10 minutes the pH stabilizes at 8.0 - 8.4. After continued stirring and cooling for a total of 1 hour, the solution is washed with ethyl acetate (2 x 50 ml.), layered over with 50 ml. of ethyl acetate, stirred, cooled, acidified carefully with concentrated hydrochloric acid to pH 2.0, saturated with sodium chloride, and the layers are separated. The a~ueous phase is extracted with additional ethyl acetate (3 x 50 ml.), the combined organic layers dried (MgSO4) and the solvent evaporated, finally at 0.2 mm. to give 4.8 g.
of a yellow-orange glass-like residue. This residue is dissolved in 35 ml. of ethyl acetate and treated with a solution of 3.5 g. of dicyclohexylamine in 5 ml. of ethyl acetate. On seeding and rubbing, - crystalline 1-[3-(acetylthio-1-oxopropyl)]-4-oxo-L-proline dicyclohexylamine salt separated, weight after cooling overnight, 2.7 g. (nearly colorless), m.p.
191-193 (dec.), Ea]26 -24 (c, 1~ in CHC13).
This dicyclohexylamine salt is converted to the free acid using potassium bisulfate as described in Example 1 (e) to give 3.7 g. of 1-~3-(acetylthio)-1-oxopropyl~-4-oxo-L-proline as a pale yellow glass-like solid.
c) 1-[3-(Acetvlthio)-l-oxopropyl]-4,4-dimethylthio-L-.
proline The 1-[3-(acetylthio)-1-oxopropyl]-4-oxo-L-113Z9~ ~18Oa
-6,-proline is reacted with methylthiol according to the procedure of Example 9 (a) to yield 1-[3-(acetylthio)-1-oxopropyl]-4,4-dimethylthio-L-proline.
d) 1-(3-Mercapto-l-oxopropyl)-4,4-dimethylthio-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield 1-(3-mercapto-1-oxopropyl)-4,4-dimethylthio-L-proline.
Example 40 [2(S),3S]-2-(3-Mercapto-2-methyl-1-oxopropyl)-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.51decane-3-carboxylic acid a) ~2(S),3S]-2-[3-(Acetylthio)-2-methyl-1-oxoPropvl]-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.5]decane-3-carboxylic acid Utilizing the procedure of Example 1 but substituting 2,2-dimethyl-1,3-propanediol for the ethylene glycol in part (c), one obtains [2(S),3S]-2-[3-(acetylthio)-2-methyl-1-oxopropyll-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.5~decane-3-carboxylic acid.
b) [2(S),3S]-2-(3-Mercapto-2-methyl-1-oxopropyl)-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.5]decane-3-car-boxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield [2(S),3S]-2-(3-mercapto-2-methyl-l-oxopropyl)-8,8-dimethyl-6,10-dioxo-2-azaspiro-~4.51decane-8-carboxylic acid.
~,, .
.
, . . . .
:, , -- :
" ' '; , : ' ~ ' 113Z98S HA180a Example 41 ~7(S),8S~-7-~3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid a) N-Carbobenzyloxy-4,4-(1-methylethylenedioxy)-L-proline, methyl ester A stirred mixture of 8 g. (0.025 mole) of N-carbobenzyloxy-4,4-dimethoxy-L-proline, methyl ester, from Example 3 a, 2.4 g. (0.032 mole) of 1,2-propanediol, 0.4 g. of p-toluenesulfonic acid monohydrate, and 400 ml. of toluene is heated to reflux (110-112). The rate of reflux is regulated so that solvent slowly distills by means of a Dean-Stark tube into a graduated cylinder. When 80 ml. of solvent are collected an equal volume of fresh solvent is added to the reaction flask through an addition funnel. This procedure of removing and replacing 80 ml. of solvent is repeated four times during a total reflux period of 1.25 hours.
After standing overnight, the mixture is washed with water. (2 x 100 ml.), the combined washes are back extracted with 100 ml. of toluene, the combined organic layers are dried (MgSO4), and the solvent is removed on a rotary evaporator, finally at 0.2 mm., to give 8.2 g. (99~) of N-carbobenzyloxy-4,4~ methylethylenedioxy)-L-proline, methyl ester as a yellow viscous oil.
b) N-Carbobenzyloxy-4,4-(1-methylethylenedioxy)-L-proline The crude methyl ester product from part (a) (8.2 g., 0.025 mole) is dissolved in 80 ml. of methanol, .
' :,, ' ; :
~ \
~13~ HAl80a treated dropwise at -1 to 4 with 18 ml: (0.036 mole) of 2N sodium hydroxide, ~ept at 0 for one hour, and at room temperature overnight. After removing about half of the solvent on a rotary evaporator, the S solution is diluted with lS0 ml. of water, washed with lO0 ml. of ether (wash discarded), acidified while cooling with 6.3 ml. of 1:1 hydrochloric acid to pH2, and extracted with ethyl acetate (4 x 75 ml.). The combined extracts are washed with 50 ml. of saturated sodium chloride, dried (MgSO4), and the solvent evap-orated to give 8 g. of a red-orange viscous oil. This oil is dissolved in 50 ml. of acetonitrile, warmed, stirred, and treated with 3.8 g. of l-adamantanamine.
The solid salt rapidly separates. After coolin~
overnight, the material is filtered, washed with cold acetonitrile and with ether, and dried in vacuo to yield 10.3 g. of crude adamantanamine salt; m.p.
202-204 (dec.), ta]26 -13 (c, 1% in methanol).
Following trituration with 50 ml. of ~oiling acetoni-trile and cooling, the pale tan solid salt weighed9.4 g.; m.p. 202-204 (dec.), [a]26 -13 (c 1% in methanol).
The above adamatanamine salt is suspended in 40 ml. of ethyl acetate, stirred, and treated with lN
hydrochloric acid. When two clear layers arè obtained they are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 40 ml.), the combined organic layers are dried tMgSO4), and the solvent evaporated, finally at 0.2 mm. and 40, to yield 5.8 g. (72%) of N-carbobenzyloxy-4,4-(l-methylethyl-, ,~''..
. ~, . ., - - , ~ ~
.. . .
-:...... . .
,. .
~132985 HA180a enedioxy)-L-proline as a yellow-orange viscous syrup.
c) 4,4~ ethylethylenedioxy)-L-proline A solution of the above N-carbobenzyloxy-4,4-(l-methylethylenedioxy)-L-proline (5.6 g., 0.017 mole) in 150 ml. of 2:1 methanol-water is treated with 1.6 g. of 5~ palladium-carbon catalyst and shaken under 3 atmospheres of hydrogen for five hours.
The catalyst is filtered off under nitrogen, washed with methanol, and the combined filtrates evaporated, finally at 0.1 - 0.2 mm. to give a crystalline residue.
The latter is suspended in 200 ml. of methanol and the evaporation repeated. The solid residue is rubbed under ether (evaporation again repeated) to yield 3.0 g. (94%) of pale tan 4,4-(1-methylethylenedioxy)-L-proline; m.p. 219-221 (dec.); preceded by gradual darkening and sintering; [~125 -22 (c, 1~ in 1:1 ethanol-water).
d) [7(S)~8S]-7-[3-(Acetylthio)-2-methyl-l-oxopropYl]
1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid The 4,4-(1-methylethylenedioxy)-L-proline (2.8 g., 0.015 mole) is reacted with 3.0 g. (0.017 mole3 of D-3-acetylthio-2-methylpropionyl chloride in 40 ml. of water according to the procedure of Example 1 (e) to give 5.0 g. of a viscous yellow product. The latter is treated with 2.8 g. of dicyclo-hexylamine in 45 ml. of ethyl acetate to yield 4.2 g. of nearly colorless [7(S),8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyll-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid, dicyclohexylamine salt;
' , :~ .
. . .
.
' HA180a m.p. 170-172 (s, 168); ~a]DS -58; (c, 1~ in ethanol). Following crystallization from 12 ml. of acetonitrile, the colorless solid salt weighs 3.85 g. (51~); m.p. 170 - 172 (s. 168);
[]D5 ~57~ (c, 1% in ethanol).
C, 60.90; H, 8.65; r~, 5.46: S, 6.26 Found: C, 60.93; H, 8.72; ~, 5.43; S, 6.35.
The dicyclohexylamine salt is converted to the free acid by suspending 3.8 g. in ethyl acetate and treating with 45 ml. of 10% potassium bisulfate and stirring until two layers are obtained. After separa-ting, the aqueous phase is extracted with ethyl acetate (4 x 40 ml.), the organic layers are combined, dried (MgSO4) and the solvent evaporated to give 2.5 g.
(51~) of colorless solid [7(S),8S~-7-[3-(acetylthio)-2-met~yl-l-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-2-methyl-8-carboxylic acid, m.p. 65 - 68 (s. 48);
[a]D5 -100, (c, 1% in ethanol).
_~ [7(S),8S~-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid The product from part (d) is hydrolyzed with concentrated ammonia according to the procedure of E~ple 2 to give 2.05 g. of [7(S),85]-7-(3-mercapto-2-methyl-1-oxcpr~pyl)-l~4-dioxor7-azaspiror4.4]nonane-2-methyl-8-carboxylic acid as a vi~us colorless oil, [a]D -57 (c, 1% in ethanol).
Examples 42 - 75 Following the procedure of Example 41 the dimethoxy substituted compound of Column I (or its alkyl ester) is treated with the diol or dithiol ,"
1~3ZgaS
HA180a of Column II to yield the spiro in~ermediate of column III. Removal of the N-protecting group (and the alkyl ester group) and acylation with the acyl chloride or Column IV yields the product of Column V which can then be hydrolyzed to the product of Column VI.
Col. I Col. II
9~ ~ 10 C \ (C)t (H ~C)p (CH2)q ~~ Cbz-N- C-COOH Hl H
Col. III Col. IV
Rg Rl o 1l 1 4 1 3 11 '~ / R8-C-S- (CH)m-C-- C-Cl ~ (C),t~ R6 1~ ,/
C
(H2C) p ( ~CH2 q Cb z -N ----C- COOH
H
~1 32985 HA18 0 a Col. V
~, Xf (C)~
1\ /' 2 / C, il lR4 IR3 O (H2CI )p ( ICH2)q R -C-S- (CH)-- C-- C N - C-COOH
Col. VI
\ /
~ (C),~
1\ / 2 / C~
IR4 R3 ( 2 1 ) P ( ICH2 ) q H5--~CH)-- C--C N - C-COOH
m l I
,~ ' . ` " ' ` .i `
, , :
- ~i3Z98S
~A180a s S a ~ S
S O ~
C~ ~ O X
~ X 5: ~ O ~ 0~ ~ U~ O ~
C.) x .~ ~
:
.
- `` 113Z3H5 HAlaOa u ((~ J?
3 ~ :~
.'~ ~ ~.
U U
In t~ =
O ~ U ~ U--O
~-U-- ~ ~/ \ I I
-- -- --O = C~
- ' ~
HAl 80a S U
~ N Cl 2 5: ~--O 3~ ~ O 5:
k'-v U~--O :~ U~ O ~ O ~ O r _ _ cn ~ "~ u~
'~
, , . :
, :
~ '- ' ' ~:: ' : ~
li3298~ HA180a O~ .
C~)N ~
.
u~l u7 u~ n ~. ~
~329B5 HA180a 2~ ~
N _i N
~ :C
V
V V--O ~ q v_oO~ O~aU, I
:C
.
. . . . .
, . . ; .
, . . . I
.
. . ~ ~ - .
, . . . . .
- . .
.
1132~5 HA180a ~,~
,, ,~ ,, . _, ~ s :::
u u u u u U ~ ~ U _ O
~ u ---o u -- u~
= ~ o ~ = u,~ o o .
'~ ' : . ~
HA180a U ~ oN U (~)~
I ~ . N
~' U S~
~ ,_ ~
U--~ ~ S ~
S ~ ~ -- ~
U~--~n U~--O I U--U
u~--o t, - 8 ~ , , , , ~ ~
"
. ~ , - .
"
. . .. , . . . .~ . ~ . .. ~ .
.. ~ :, . .. ...
. ~, ; ; .. .. .
, ... ., , : , , . -,,`~ ~3Z9~
~!Al 80a 2: S -- ~
~ Ul ~ 7 2 0 ~ r~
O ~ ~
_N N ~ -- O
I ~I N
_I N N ~
r r 1~ ~
~ : , , , , .. - .: ~
`'' ~13~5 HAl~Oa Examples 75 - 124 Following the procedure of Example 41 the disubstituted compound of Column I ~or its alkyl ester) is treated with a molar equivalent of the alcohol or thiol of Column II to yield the compound shown in Column III. Alternatively, by treating the dimethoxy substituted compound of formula I (or its alkyl ester) with a molar excess of the alcohol or thiol of Column II one obtains the disubstituted compound of Column IV. Removal of the N-protecting group (and the alkyl.ester group) from the inter-mediate of either Column III or IV followed by acylation with the acid chloride of Column v yields the product of Columns VI and VII, respectively.
These compounds can then be hydrolyzed to the products of Columns VIII and IX, respectively, Col. I Col. II
Rl 1 1 X~ Xl R -X-H
/
~ C~
(H~C) (IC 2 q Cbz-N - C-COOH
.' , .. ' , .:
:
, '`: ' '' ~:
~- . . : ~ : . :
.. ..
HA180a Col. III Col. IV
Rl lR2 1 2 lR2 2 ~C / 2 \~ / \
(H2iC)p (ClH2)q (H2C) (CH
Cbz-N~ C-COOH Cbz-N-- - C-COOH
H H
Col. V
O R4 R3 e R8-C-S- (CH) m~C--C-Cl Col. VI
IRl IR2 X~ /X2 ,/ \
O R4 R3 ( 21 )p (1CH2)q R8-c-s-(cH)m-c--C --N -- C-COOH
.~
.
11'~
HA180a Col. VII
X;~, X2 ~ C~
O R4 R O 2 1 ) p (Cl H2 ) q R -C-S- ~CH) m~C-- C N _ C-COOH
R6 ` H
Col. VIII
1 l 1 2 Xl X2 , / C
1 4 1 3 l ~H2C) p ( ICH2) q HS- (CH)m-C--C--N C-COOH
H
~ .
, ..-,, .
., , . ~ ~ . ' ' ~ . ' ' '................... . . '.`. ' . i ~ ' ', . . ' ' . ' . _ ~13Z985 K~18 0a Col. IX
i 2 lR2 / C ,~
R4 R3 O~H2 I p ( ICH2) q HS- (CH~ m-- C--- C - . N --- C-COOH
~' ' "', ' ~ .
. ' '- , HA180a --~2--~jJ
u C~n u ~ ~
N ~ 1 N _I
~1 = = = = ~ , ,, ~1 3; ~ 1 '' 2 ~
y y ~r~
O
~I ~ Y Y 2 X y y ., vl y y CJ
X ~ ~ 0~ O ~0 0 ~1 Y -Y -Y Y Y Y Y
X-~l , , , _I
~ r ` ~ o ? ~ , ; ~ i ``
~13Z985 HA180a !~ ~ _N
S~ u~
~ X `C 3 = ~ ...
". U U U _~ S
3~ ~ ~ o o o o o o o o o , . . . . . ..
N '9 0 IO
.
:~3;~85 HAl~Oa 1) 0 Nt--l ~i _I _I .--1 '.'`1 _I N --I
t,~
~ 3 ~ _ ~ 3 ~
,.
U ~ T
! J I ~ ~ U~
SC,) U ~ ~ o o o U ~ U 1~
t~ t-l _I t~ ~
a~ o ~ Ln ~D '.~0 ~' ' .
: ~ :
: ' ` ` ' ' ~ , .
~180a r' ~ 5~ ur~
I N _I N
3~ 2 = ~:
=
~ u~ ~ r-5~
U O U ' U C~ U
a~ o O O O O O O O
. .
HA180a IN
I N U
S ~S 2 N ~) ~
_~ u t~ u c u c~
o N _I ~ N _I _I N ~
~: 2 2 1 3: ~ -- S S
2 2 ~ ~ 5:
t~ U t.) S
N ~) N (~ O
(~) N N C~
o~ ~ ~ o o o o o u~ . tn N c~ J 2 ~ I N N ~
O O ~
, . . ~ .
. ~ . .
}i~180a --~7--u c~
' X
t~ U X C~ U
3: 1 5: ~ I I I I
~ (~(,)J ~ ) o $
~`J ~ 3 ~ ~ N ~ ~
U
u~ ~n o o o o u~
X
O O O O O O O O
1~a~ ~ o _, t~l ~er .. . .
.
,, ' ' ' ~13;~i HA180a --8~--Example 125 (S,S,S,S)-7,7'-~Dithiobis(2-methyl-1-oxo-3,1-propane-diyl)]bis~1,4-dioxa-7-azaspiro[4.4~nonane-8-carboxylic acid]
~7(S),8Sl-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid t3.0 g., 0.0109 mole) from Example 2 is dissolved in 80 ml. of water and the pH is adjusted to 6.5 with lN sodium hydroxide. To this stirred solution is added dropwise a total of 11 ml. of 0.5 M iodine solution in 95% ethanol (6.34 g. iodine/50 ml. solution) while maintaining the pH at 5.5 to 6.5 with lN sodium hydrox-ide. After 15 minutes, a trace of excess iodine is removed with dilute sodium thiosulfate and ~e solution is concentrated to approx~tely 50 ml., ccoled and acidified with 1:1 hydrochloric acid. Methylene chloride (30 ml.) is added and the mixture is saturated with sodium chloride, stirred, and the layers separated. The aqueous phase is extracted with additional methylene chloride (3 x 20 ml.), the combined organic layers dried (MgSO4), and the solvent evaporated, finally at 0.2 mm. The brittle residue is rubbed under ether and the evaporation repeated to give 2.8 g. of a pale yellow solid residue. The material is redisso ved in 50 ml. of methylene chloride, washed with water (3 x 10 ml.), the combined a~ueous layers back-extracted with 20 ml. of methylene chloride, and the combined layers dried (MgSO4). Evaporation and tri-turation with ether as above yields 2.2 g. (73%) of cream-colored amorphous solid (S,S,S,S)-7,7'-, -. . . :~
1~32~ H~18Oa -8~-Edithiobis(2-methyl-1-oxo-3,1-propanediyl)lbis[1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid];
m.p. 61-63 (foaming), (s. 50), [a]26 -92 (c, 1~ in ethanol~.
Anal. Calc d- for C22~32 2 10 2 C, 46.63; H. 6.05; N, 4.94; S, 11.31 Found: C, 46.52; H, 6.29; N, 4.63; S, 10.96.
Example 126 (S,S,S,S)-7,7'-[Dithiobis(2-methyl-oxo-3,1-propane-diyl)]bis[7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid]
[7~S),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-
d) 1-(3-Mercapto-l-oxopropyl)-4,4-dimethylthio-L-proline The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield 1-(3-mercapto-1-oxopropyl)-4,4-dimethylthio-L-proline.
Example 40 [2(S),3S]-2-(3-Mercapto-2-methyl-1-oxopropyl)-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.51decane-3-carboxylic acid a) ~2(S),3S]-2-[3-(Acetylthio)-2-methyl-1-oxoPropvl]-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.5]decane-3-carboxylic acid Utilizing the procedure of Example 1 but substituting 2,2-dimethyl-1,3-propanediol for the ethylene glycol in part (c), one obtains [2(S),3S]-2-[3-(acetylthio)-2-methyl-1-oxopropyll-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.5~decane-3-carboxylic acid.
b) [2(S),3S]-2-(3-Mercapto-2-methyl-1-oxopropyl)-8,8-dimethyl-6,10-dioxo-2-azaspiro[4.5]decane-3-car-boxylic acid The product from part (a) is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield [2(S),3S]-2-(3-mercapto-2-methyl-l-oxopropyl)-8,8-dimethyl-6,10-dioxo-2-azaspiro-~4.51decane-8-carboxylic acid.
~,, .
.
, . . . .
:, , -- :
" ' '; , : ' ~ ' 113Z98S HA180a Example 41 ~7(S),8S~-7-~3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid a) N-Carbobenzyloxy-4,4-(1-methylethylenedioxy)-L-proline, methyl ester A stirred mixture of 8 g. (0.025 mole) of N-carbobenzyloxy-4,4-dimethoxy-L-proline, methyl ester, from Example 3 a, 2.4 g. (0.032 mole) of 1,2-propanediol, 0.4 g. of p-toluenesulfonic acid monohydrate, and 400 ml. of toluene is heated to reflux (110-112). The rate of reflux is regulated so that solvent slowly distills by means of a Dean-Stark tube into a graduated cylinder. When 80 ml. of solvent are collected an equal volume of fresh solvent is added to the reaction flask through an addition funnel. This procedure of removing and replacing 80 ml. of solvent is repeated four times during a total reflux period of 1.25 hours.
After standing overnight, the mixture is washed with water. (2 x 100 ml.), the combined washes are back extracted with 100 ml. of toluene, the combined organic layers are dried (MgSO4), and the solvent is removed on a rotary evaporator, finally at 0.2 mm., to give 8.2 g. (99~) of N-carbobenzyloxy-4,4~ methylethylenedioxy)-L-proline, methyl ester as a yellow viscous oil.
b) N-Carbobenzyloxy-4,4-(1-methylethylenedioxy)-L-proline The crude methyl ester product from part (a) (8.2 g., 0.025 mole) is dissolved in 80 ml. of methanol, .
' :,, ' ; :
~ \
~13~ HAl80a treated dropwise at -1 to 4 with 18 ml: (0.036 mole) of 2N sodium hydroxide, ~ept at 0 for one hour, and at room temperature overnight. After removing about half of the solvent on a rotary evaporator, the S solution is diluted with lS0 ml. of water, washed with lO0 ml. of ether (wash discarded), acidified while cooling with 6.3 ml. of 1:1 hydrochloric acid to pH2, and extracted with ethyl acetate (4 x 75 ml.). The combined extracts are washed with 50 ml. of saturated sodium chloride, dried (MgSO4), and the solvent evap-orated to give 8 g. of a red-orange viscous oil. This oil is dissolved in 50 ml. of acetonitrile, warmed, stirred, and treated with 3.8 g. of l-adamantanamine.
The solid salt rapidly separates. After coolin~
overnight, the material is filtered, washed with cold acetonitrile and with ether, and dried in vacuo to yield 10.3 g. of crude adamantanamine salt; m.p.
202-204 (dec.), ta]26 -13 (c, 1% in methanol).
Following trituration with 50 ml. of ~oiling acetoni-trile and cooling, the pale tan solid salt weighed9.4 g.; m.p. 202-204 (dec.), [a]26 -13 (c 1% in methanol).
The above adamatanamine salt is suspended in 40 ml. of ethyl acetate, stirred, and treated with lN
hydrochloric acid. When two clear layers arè obtained they are separated, the aqueous phase is extracted with additional ethyl acetate (3 x 40 ml.), the combined organic layers are dried tMgSO4), and the solvent evaporated, finally at 0.2 mm. and 40, to yield 5.8 g. (72%) of N-carbobenzyloxy-4,4-(l-methylethyl-, ,~''..
. ~, . ., - - , ~ ~
.. . .
-:...... . .
,. .
~132985 HA180a enedioxy)-L-proline as a yellow-orange viscous syrup.
c) 4,4~ ethylethylenedioxy)-L-proline A solution of the above N-carbobenzyloxy-4,4-(l-methylethylenedioxy)-L-proline (5.6 g., 0.017 mole) in 150 ml. of 2:1 methanol-water is treated with 1.6 g. of 5~ palladium-carbon catalyst and shaken under 3 atmospheres of hydrogen for five hours.
The catalyst is filtered off under nitrogen, washed with methanol, and the combined filtrates evaporated, finally at 0.1 - 0.2 mm. to give a crystalline residue.
The latter is suspended in 200 ml. of methanol and the evaporation repeated. The solid residue is rubbed under ether (evaporation again repeated) to yield 3.0 g. (94%) of pale tan 4,4-(1-methylethylenedioxy)-L-proline; m.p. 219-221 (dec.); preceded by gradual darkening and sintering; [~125 -22 (c, 1~ in 1:1 ethanol-water).
d) [7(S)~8S]-7-[3-(Acetylthio)-2-methyl-l-oxopropYl]
1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid The 4,4-(1-methylethylenedioxy)-L-proline (2.8 g., 0.015 mole) is reacted with 3.0 g. (0.017 mole3 of D-3-acetylthio-2-methylpropionyl chloride in 40 ml. of water according to the procedure of Example 1 (e) to give 5.0 g. of a viscous yellow product. The latter is treated with 2.8 g. of dicyclo-hexylamine in 45 ml. of ethyl acetate to yield 4.2 g. of nearly colorless [7(S),8S]-7-[3-(acetylthio)-2-methyl-1-oxopropyll-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid, dicyclohexylamine salt;
' , :~ .
. . .
.
' HA180a m.p. 170-172 (s, 168); ~a]DS -58; (c, 1~ in ethanol). Following crystallization from 12 ml. of acetonitrile, the colorless solid salt weighs 3.85 g. (51~); m.p. 170 - 172 (s. 168);
[]D5 ~57~ (c, 1% in ethanol).
C, 60.90; H, 8.65; r~, 5.46: S, 6.26 Found: C, 60.93; H, 8.72; ~, 5.43; S, 6.35.
The dicyclohexylamine salt is converted to the free acid by suspending 3.8 g. in ethyl acetate and treating with 45 ml. of 10% potassium bisulfate and stirring until two layers are obtained. After separa-ting, the aqueous phase is extracted with ethyl acetate (4 x 40 ml.), the organic layers are combined, dried (MgSO4) and the solvent evaporated to give 2.5 g.
(51~) of colorless solid [7(S),8S~-7-[3-(acetylthio)-2-met~yl-l-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-2-methyl-8-carboxylic acid, m.p. 65 - 68 (s. 48);
[a]D5 -100, (c, 1% in ethanol).
_~ [7(S),8S~-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid The product from part (d) is hydrolyzed with concentrated ammonia according to the procedure of E~ple 2 to give 2.05 g. of [7(S),85]-7-(3-mercapto-2-methyl-1-oxcpr~pyl)-l~4-dioxor7-azaspiror4.4]nonane-2-methyl-8-carboxylic acid as a vi~us colorless oil, [a]D -57 (c, 1% in ethanol).
Examples 42 - 75 Following the procedure of Example 41 the dimethoxy substituted compound of Column I (or its alkyl ester) is treated with the diol or dithiol ,"
1~3ZgaS
HA180a of Column II to yield the spiro in~ermediate of column III. Removal of the N-protecting group (and the alkyl ester group) and acylation with the acyl chloride or Column IV yields the product of Column V which can then be hydrolyzed to the product of Column VI.
Col. I Col. II
9~ ~ 10 C \ (C)t (H ~C)p (CH2)q ~~ Cbz-N- C-COOH Hl H
Col. III Col. IV
Rg Rl o 1l 1 4 1 3 11 '~ / R8-C-S- (CH)m-C-- C-Cl ~ (C),t~ R6 1~ ,/
C
(H2C) p ( ~CH2 q Cb z -N ----C- COOH
H
~1 32985 HA18 0 a Col. V
~, Xf (C)~
1\ /' 2 / C, il lR4 IR3 O (H2CI )p ( ICH2)q R -C-S- (CH)-- C-- C N - C-COOH
Col. VI
\ /
~ (C),~
1\ / 2 / C~
IR4 R3 ( 2 1 ) P ( ICH2 ) q H5--~CH)-- C--C N - C-COOH
m l I
,~ ' . ` " ' ` .i `
, , :
- ~i3Z98S
~A180a s S a ~ S
S O ~
C~ ~ O X
~ X 5: ~ O ~ 0~ ~ U~ O ~
C.) x .~ ~
:
.
- `` 113Z3H5 HAlaOa u ((~ J?
3 ~ :~
.'~ ~ ~.
U U
In t~ =
O ~ U ~ U--O
~-U-- ~ ~/ \ I I
-- -- --O = C~
- ' ~
HAl 80a S U
~ N Cl 2 5: ~--O 3~ ~ O 5:
k'-v U~--O :~ U~ O ~ O ~ O r _ _ cn ~ "~ u~
'~
, , . :
, :
~ '- ' ' ~:: ' : ~
li3298~ HA180a O~ .
C~)N ~
.
u~l u7 u~ n ~. ~
~329B5 HA180a 2~ ~
N _i N
~ :C
V
V V--O ~ q v_oO~ O~aU, I
:C
.
. . . . .
, . . ; .
, . . . I
.
. . ~ ~ - .
, . . . . .
- . .
.
1132~5 HA180a ~,~
,, ,~ ,, . _, ~ s :::
u u u u u U ~ ~ U _ O
~ u ---o u -- u~
= ~ o ~ = u,~ o o .
'~ ' : . ~
HA180a U ~ oN U (~)~
I ~ . N
~' U S~
~ ,_ ~
U--~ ~ S ~
S ~ ~ -- ~
U~--~n U~--O I U--U
u~--o t, - 8 ~ , , , , ~ ~
"
. ~ , - .
"
. . .. , . . . .~ . ~ . .. ~ .
.. ~ :, . .. ...
. ~, ; ; .. .. .
, ... ., , : , , . -,,`~ ~3Z9~
~!Al 80a 2: S -- ~
~ Ul ~ 7 2 0 ~ r~
O ~ ~
_N N ~ -- O
I ~I N
_I N N ~
r r 1~ ~
~ : , , , , .. - .: ~
`'' ~13~5 HAl~Oa Examples 75 - 124 Following the procedure of Example 41 the disubstituted compound of Column I ~or its alkyl ester) is treated with a molar equivalent of the alcohol or thiol of Column II to yield the compound shown in Column III. Alternatively, by treating the dimethoxy substituted compound of formula I (or its alkyl ester) with a molar excess of the alcohol or thiol of Column II one obtains the disubstituted compound of Column IV. Removal of the N-protecting group (and the alkyl.ester group) from the inter-mediate of either Column III or IV followed by acylation with the acid chloride of Column v yields the product of Columns VI and VII, respectively.
These compounds can then be hydrolyzed to the products of Columns VIII and IX, respectively, Col. I Col. II
Rl 1 1 X~ Xl R -X-H
/
~ C~
(H~C) (IC 2 q Cbz-N - C-COOH
.' , .. ' , .:
:
, '`: ' '' ~:
~- . . : ~ : . :
.. ..
HA180a Col. III Col. IV
Rl lR2 1 2 lR2 2 ~C / 2 \~ / \
(H2iC)p (ClH2)q (H2C) (CH
Cbz-N~ C-COOH Cbz-N-- - C-COOH
H H
Col. V
O R4 R3 e R8-C-S- (CH) m~C--C-Cl Col. VI
IRl IR2 X~ /X2 ,/ \
O R4 R3 ( 21 )p (1CH2)q R8-c-s-(cH)m-c--C --N -- C-COOH
.~
.
11'~
HA180a Col. VII
X;~, X2 ~ C~
O R4 R O 2 1 ) p (Cl H2 ) q R -C-S- ~CH) m~C-- C N _ C-COOH
R6 ` H
Col. VIII
1 l 1 2 Xl X2 , / C
1 4 1 3 l ~H2C) p ( ICH2) q HS- (CH)m-C--C--N C-COOH
H
~ .
, ..-,, .
., , . ~ ~ . ' ' ~ . ' ' '................... . . '.`. ' . i ~ ' ', . . ' ' . ' . _ ~13Z985 K~18 0a Col. IX
i 2 lR2 / C ,~
R4 R3 O~H2 I p ( ICH2) q HS- (CH~ m-- C--- C - . N --- C-COOH
~' ' "', ' ~ .
. ' '- , HA180a --~2--~jJ
u C~n u ~ ~
N ~ 1 N _I
~1 = = = = ~ , ,, ~1 3; ~ 1 '' 2 ~
y y ~r~
O
~I ~ Y Y 2 X y y ., vl y y CJ
X ~ ~ 0~ O ~0 0 ~1 Y -Y -Y Y Y Y Y
X-~l , , , _I
~ r ` ~ o ? ~ , ; ~ i ``
~13Z985 HA180a !~ ~ _N
S~ u~
~ X `C 3 = ~ ...
". U U U _~ S
3~ ~ ~ o o o o o o o o o , . . . . . ..
N '9 0 IO
.
:~3;~85 HAl~Oa 1) 0 Nt--l ~i _I _I .--1 '.'`1 _I N --I
t,~
~ 3 ~ _ ~ 3 ~
,.
U ~ T
! J I ~ ~ U~
SC,) U ~ ~ o o o U ~ U 1~
t~ t-l _I t~ ~
a~ o ~ Ln ~D '.~0 ~' ' .
: ~ :
: ' ` ` ' ' ~ , .
~180a r' ~ 5~ ur~
I N _I N
3~ 2 = ~:
=
~ u~ ~ r-5~
U O U ' U C~ U
a~ o O O O O O O O
. .
HA180a IN
I N U
S ~S 2 N ~) ~
_~ u t~ u c u c~
o N _I ~ N _I _I N ~
~: 2 2 1 3: ~ -- S S
2 2 ~ ~ 5:
t~ U t.) S
N ~) N (~ O
(~) N N C~
o~ ~ ~ o o o o o u~ . tn N c~ J 2 ~ I N N ~
O O ~
, . . ~ .
. ~ . .
}i~180a --~7--u c~
' X
t~ U X C~ U
3: 1 5: ~ I I I I
~ (~(,)J ~ ) o $
~`J ~ 3 ~ ~ N ~ ~
U
u~ ~n o o o o u~
X
O O O O O O O O
1~a~ ~ o _, t~l ~er .. . .
.
,, ' ' ' ~13;~i HA180a --8~--Example 125 (S,S,S,S)-7,7'-~Dithiobis(2-methyl-1-oxo-3,1-propane-diyl)]bis~1,4-dioxa-7-azaspiro[4.4~nonane-8-carboxylic acid]
~7(S),8Sl-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid t3.0 g., 0.0109 mole) from Example 2 is dissolved in 80 ml. of water and the pH is adjusted to 6.5 with lN sodium hydroxide. To this stirred solution is added dropwise a total of 11 ml. of 0.5 M iodine solution in 95% ethanol (6.34 g. iodine/50 ml. solution) while maintaining the pH at 5.5 to 6.5 with lN sodium hydrox-ide. After 15 minutes, a trace of excess iodine is removed with dilute sodium thiosulfate and ~e solution is concentrated to approx~tely 50 ml., ccoled and acidified with 1:1 hydrochloric acid. Methylene chloride (30 ml.) is added and the mixture is saturated with sodium chloride, stirred, and the layers separated. The aqueous phase is extracted with additional methylene chloride (3 x 20 ml.), the combined organic layers dried (MgSO4), and the solvent evaporated, finally at 0.2 mm. The brittle residue is rubbed under ether and the evaporation repeated to give 2.8 g. of a pale yellow solid residue. The material is redisso ved in 50 ml. of methylene chloride, washed with water (3 x 10 ml.), the combined a~ueous layers back-extracted with 20 ml. of methylene chloride, and the combined layers dried (MgSO4). Evaporation and tri-turation with ether as above yields 2.2 g. (73%) of cream-colored amorphous solid (S,S,S,S)-7,7'-, -. . . :~
1~32~ H~18Oa -8~-Edithiobis(2-methyl-1-oxo-3,1-propanediyl)lbis[1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid];
m.p. 61-63 (foaming), (s. 50), [a]26 -92 (c, 1~ in ethanol~.
Anal. Calc d- for C22~32 2 10 2 C, 46.63; H. 6.05; N, 4.94; S, 11.31 Found: C, 46.52; H, 6.29; N, 4.63; S, 10.96.
Example 126 (S,S,S,S)-7,7'-[Dithiobis(2-methyl-oxo-3,1-propane-diyl)]bis[7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid]
[7~S),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-
7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid from Example 10 is reacted with iodine according to the procedure of Example125 to yield (S,S,S,S)-7,7'-~dithiobis(2-methyl-1-oxo-3,1-propanediyl)]bis-[7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid].
Example 127 (S,S,S,S)-l,l'-[Dithiobis(2-methyl-1-oxo-3,1-pro-panediyl)]bis[4,4-dimethoxy-L-proline]
(5)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline from Example 4 is reacted with iodine according to the procedure of Example 125 ~o yield (S,S,S,S)-l,l'-[dithiobis(2-methyl-1-oxo-3,1-propanediyl)]bis[4,4-dimethoxy-L-proline].
Example 128 ~7(S),8(S)]-7-[3-(Acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, methyl ester A solution of the product of Example 1 in .~
-` 113298S
HAlaOa --so--ether is treated with a slight excess of diazo-methane. After standing at room temperature for two hours, the solvent is evaporated to give t7~S),8S]-7-13-(acetylthio)-2-methyl- 1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, methyl ester.
Example 129 ~7(S),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid, methyl ester The product from Example 128 is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield ~7(S),8S]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-
Example 127 (S,S,S,S)-l,l'-[Dithiobis(2-methyl-1-oxo-3,1-pro-panediyl)]bis[4,4-dimethoxy-L-proline]
(5)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline from Example 4 is reacted with iodine according to the procedure of Example 125 ~o yield (S,S,S,S)-l,l'-[dithiobis(2-methyl-1-oxo-3,1-propanediyl)]bis[4,4-dimethoxy-L-proline].
Example 128 ~7(S),8(S)]-7-[3-(Acetylthio)-2-methyl-1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, methyl ester A solution of the product of Example 1 in .~
-` 113298S
HAlaOa --so--ether is treated with a slight excess of diazo-methane. After standing at room temperature for two hours, the solvent is evaporated to give t7~S),8S]-7-13-(acetylthio)-2-methyl- 1-oxopropyl]-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, methyl ester.
Example 129 ~7(S),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid, methyl ester The product from Example 128 is hydrolyzed with concentrated ammonia according to the procedure of Example 2 to yield ~7(S),8S]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-
8-carboxylic acid, methyl ester.
Example 130 (S)-1-~3-(Acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline, methyl ester A solution of the product from Example 3 in ether is treated with a slight excess of diazo-methane. After standing at room temperature, the solvent is evaporated to give (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline, methyl ester.
Example 131 (S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, methyl ester The product from Example 130 is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield (S)-1-(3-mercapto-2-methyl-1-. . . ; ~, .
`` li3~5 HA180a oxopropyl)-4,4-dimethoxy-L-proline, methyl ester.
Example 132 [7(S),8S] _-t3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, sodium salt A solution of 1.0 g. of the product of Example 2 is dissolved in 10 ml. of water and treated with one equivalent of sodium bicarbonate. The solution is freeze-dried to give[7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyI)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, sodium salt.
In a similar manner, by employing potassium bicarbonate the corresponding potassium salt is obtained.
Example 133 (S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, sodium salt A solution of 1.0 g. of the product of Example 4 is dissolved in 10 ml.of water and treated with one equivalent of sodium bicarbonate. The solution is freeze-dried to give (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, sodium salt.
In a similar manner, by employing potassium bicarbonate the corresponding potassium salt is obtained.
Example 134 1000 tablets each containing the following ingredients:
[7(S),8S]-7-(3-Mercapto-.
~132~
HA18Oa 2-methyl-1-oxopropyl)-1, 4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid 100 mg.
Corn starch 50 mg.
Gelatin 7.5 mg.
~vicel (microcrystalline cellulose) 25 mg.
Magnesium stearate 2.5 mg.
185 mg.
10 are prepared (from sufficient bulk quantities) by mixing the [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid and corn starch with an aqueous solution of the gelatin. The mixture is dried and lS ground to a fine powder. The Avicel and then the magnesium stearate are admixed with granulation.
This mixture is then compressed in a tablet press to form 1000 tablets each containing 100 mg. of active ingredient.
Example 135 Tablets each containing 100 mg. of (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline are produced as described in Example 134.
Example 136 1000 tablets each containing 50 mg. of [7(S), 8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid are produced from the following ingredients , ` '' ~
~.
'' ~132~5 HA180a _93_ [7(S),8Sl-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-?-azaspiro[4.4]nonane-8-carboxylic acid 50 g.
Lactose 100 g.
Avicel 150 g.
Corn starch S0 g.
Magnesium stearate S g.
The 17(S),8S]-7-[3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, lactose, and Avicel are admixed, then blended with the corn starch. Magnesium stearate is added. The dry mixture is compressed in a ta~blet press to form 1000 355 mg. tablets each containing 50 mg. of active ingredient. The tablets are coated with a solution of Methocel E 15 (methyl cellulose) including as a color a lake containing yellow #6.
Example 137 Tablets each containing 50 mg. of (S)-l-(3-mercapto-2-methyl-l-oxopropyl)-4~4-dimethoxy-L
proline are produced as described in Example 136.
Example 138 Two piece #l gelatin capsules each containing 100 mg. of [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, sodiun salt, are filled with a mixture of the following ingredients:
.
"
, : . -.
" , . , .. ,. ~
.
:
1~3Z~ HA18Oa ~7(S),8S]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid, sodium salt 100 mg.
Magnesium stearate 7 mg.
Lactose 193 mg.
Example 139 Gelatin capsules containing 100 mg. of (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, sodium salt are produced as described in Example 138.
Example 140 An injectable solution is produced as follows:
[7(5),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 500 g.
Methyl paraben 5 g.
Propyl paraben 1 g.
Sodium chloride 25 g.
Water for injection qs. 5 The active substance, preservatives and sodium chloride are dissolved in 3 liters of water and then the v~lume is brought up to 5 liters. The solution is filtered through a sterile filter and aseptically filled into pre-sterilized vials which are then closed with pre-sterilized rubber closures. Each vial contains 5 ml. of solution in a concentration of 100 mg of , ';............ ' , ~:,.
. '-'~ ' . ~
... .
HA180a _95_ active ingredient per ml. of solution for injection.
Example 141 An injectable solution containing (S)-l-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline is prepared as described in Example 140.
Example 142 6000 tablets each containing the following ingredients:
[7(S),8S3-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro-[4.4]nonane-8-carboxylic acid100 mg.
Avicel ~microcrystalline 100 mg.
cellulose) Hydrochlorothiazide - 12.5 mg.
Lactose U.S.P. 113 mg.
Corn starch U.S.P. 17.5 mg.
Stearic acid U.S.P. 7 mg.
350 mg.
are produced from sufficient bulk quantities by slugging the 17tS),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, Avicel and a portion of the stearic acid. The slugs are ground and passed through a #2 screen, then mixed with the hydrochlorothiazide, lactose, corn starch and remainder of the stearic acid. The mixture is compressed into 350 mg. capsule shaped tablets in a tablet press. The tablets are scored for dividing in half.
:`
~ zg85 - HA180a Example 143 Tablets each containing (S)-1-(3-mercapto-2-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline and hydrochlorothiazide can be prepared as described in Example 142.
The product of Examples 1, 3 and 6 to L33 can also be formulated according to the procedures of Examples 134-143.
- ~ :
. : - ~. :
Example 130 (S)-1-~3-(Acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline, methyl ester A solution of the product from Example 3 in ether is treated with a slight excess of diazo-methane. After standing at room temperature, the solvent is evaporated to give (S)-1-[3-(acetylthio)-2-methyl-1-oxopropyl]-4,4-dimethoxy-L-proline, methyl ester.
Example 131 (S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, methyl ester The product from Example 130 is hydrolyzed with concentrated ammonia according to the procedure of Example 4 to yield (S)-1-(3-mercapto-2-methyl-1-. . . ; ~, .
`` li3~5 HA180a oxopropyl)-4,4-dimethoxy-L-proline, methyl ester.
Example 132 [7(S),8S] _-t3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid, sodium salt A solution of 1.0 g. of the product of Example 2 is dissolved in 10 ml. of water and treated with one equivalent of sodium bicarbonate. The solution is freeze-dried to give[7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyI)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, sodium salt.
In a similar manner, by employing potassium bicarbonate the corresponding potassium salt is obtained.
Example 133 (S)-1-(3-Mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, sodium salt A solution of 1.0 g. of the product of Example 4 is dissolved in 10 ml.of water and treated with one equivalent of sodium bicarbonate. The solution is freeze-dried to give (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, sodium salt.
In a similar manner, by employing potassium bicarbonate the corresponding potassium salt is obtained.
Example 134 1000 tablets each containing the following ingredients:
[7(S),8S]-7-(3-Mercapto-.
~132~
HA18Oa 2-methyl-1-oxopropyl)-1, 4-dioxo-7-azaspiro~4.4]nonane-8-carboxylic acid 100 mg.
Corn starch 50 mg.
Gelatin 7.5 mg.
~vicel (microcrystalline cellulose) 25 mg.
Magnesium stearate 2.5 mg.
185 mg.
10 are prepared (from sufficient bulk quantities) by mixing the [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid and corn starch with an aqueous solution of the gelatin. The mixture is dried and lS ground to a fine powder. The Avicel and then the magnesium stearate are admixed with granulation.
This mixture is then compressed in a tablet press to form 1000 tablets each containing 100 mg. of active ingredient.
Example 135 Tablets each containing 100 mg. of (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline are produced as described in Example 134.
Example 136 1000 tablets each containing 50 mg. of [7(S), 8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid are produced from the following ingredients , ` '' ~
~.
'' ~132~5 HA180a _93_ [7(S),8Sl-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-?-azaspiro[4.4]nonane-8-carboxylic acid 50 g.
Lactose 100 g.
Avicel 150 g.
Corn starch S0 g.
Magnesium stearate S g.
The 17(S),8S]-7-[3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, lactose, and Avicel are admixed, then blended with the corn starch. Magnesium stearate is added. The dry mixture is compressed in a ta~blet press to form 1000 355 mg. tablets each containing 50 mg. of active ingredient. The tablets are coated with a solution of Methocel E 15 (methyl cellulose) including as a color a lake containing yellow #6.
Example 137 Tablets each containing 50 mg. of (S)-l-(3-mercapto-2-methyl-l-oxopropyl)-4~4-dimethoxy-L
proline are produced as described in Example 136.
Example 138 Two piece #l gelatin capsules each containing 100 mg. of [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, sodiun salt, are filled with a mixture of the following ingredients:
.
"
, : . -.
" , . , .. ,. ~
.
:
1~3Z~ HA18Oa ~7(S),8S]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspirot4.4]nonane-8-carboxylic acid, sodium salt 100 mg.
Magnesium stearate 7 mg.
Lactose 193 mg.
Example 139 Gelatin capsules containing 100 mg. of (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, sodium salt are produced as described in Example 138.
Example 140 An injectable solution is produced as follows:
[7(5),8S]-7-(3-Mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid 500 g.
Methyl paraben 5 g.
Propyl paraben 1 g.
Sodium chloride 25 g.
Water for injection qs. 5 The active substance, preservatives and sodium chloride are dissolved in 3 liters of water and then the v~lume is brought up to 5 liters. The solution is filtered through a sterile filter and aseptically filled into pre-sterilized vials which are then closed with pre-sterilized rubber closures. Each vial contains 5 ml. of solution in a concentration of 100 mg of , ';............ ' , ~:,.
. '-'~ ' . ~
... .
HA180a _95_ active ingredient per ml. of solution for injection.
Example 141 An injectable solution containing (S)-l-(3-mercapto-2-methyl-1-oxopropyl)-4,4-dimethoxy-L-proline is prepared as described in Example 140.
Example 142 6000 tablets each containing the following ingredients:
[7(S),8S3-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro-[4.4]nonane-8-carboxylic acid100 mg.
Avicel ~microcrystalline 100 mg.
cellulose) Hydrochlorothiazide - 12.5 mg.
Lactose U.S.P. 113 mg.
Corn starch U.S.P. 17.5 mg.
Stearic acid U.S.P. 7 mg.
350 mg.
are produced from sufficient bulk quantities by slugging the 17tS),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, Avicel and a portion of the stearic acid. The slugs are ground and passed through a #2 screen, then mixed with the hydrochlorothiazide, lactose, corn starch and remainder of the stearic acid. The mixture is compressed into 350 mg. capsule shaped tablets in a tablet press. The tablets are scored for dividing in half.
:`
~ zg85 - HA180a Example 143 Tablets each containing (S)-1-(3-mercapto-2-methyl-l-oxopropyl)-4,4-dimethoxy-L-proline and hydrochlorothiazide can be prepared as described in Example 142.
The product of Examples 1, 3 and 6 to L33 can also be formulated according to the procedures of Examples 134-143.
- ~ :
. : - ~. :
Claims (28)
1. A process for preparing a compound of the formula or a pharmaceutically acceptable salt thereof, wherein R is hydrogen or lower alkyl;
R1 and R2 are independently selected from the group consisting of lower alkyl, or R1 and R2 join together in a polymethylene chain of the formula X1 and X2 are independently selected from the group consisting of oxygen and sulfur;
R3 and R4 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkylthio, -(CH2)n-SH, and halo substituted lower alkyl;
R6 is hydrogen or lower alkyl provided that R6 is lower alkyl only when R3 is lower alkyl;
m is zero, one or two;
n is one, two or three;
p and q are each one or two provided that both are not two;
t is two or three;
R9 and R10 are both hydrogen, both lower alkyl, or one is hydrogen and the other is lower alkyl;
R5 is hydrogen, a hydrolyzably removable protecting, a chemically removable protecting group, or provided that neither R3 or R4 is -(CH2)n-SH
HA180a characterized by:
(1) coupling a substituted proline or pipecolic acid of the formula with an acid of the formula wherein R5 is hydrogen or a hydrolyzably or chemically removable protecting group, or (2) treating a compound of the formula wherein R5 is hereinabove defined with alcohols or thiols selected from the group consisting of R1X1H
R2X2H and to form a product wherein R5 is hydrogen or a hydrolyzably or chemically removable protecting group, and removing said protecting group to form a product wherein R5 is hydrogen, and oxidizing said products wherein R5 is hydrogen to form the product wherein R5 is
R1 and R2 are independently selected from the group consisting of lower alkyl, or R1 and R2 join together in a polymethylene chain of the formula X1 and X2 are independently selected from the group consisting of oxygen and sulfur;
R3 and R4 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkylthio, -(CH2)n-SH, and halo substituted lower alkyl;
R6 is hydrogen or lower alkyl provided that R6 is lower alkyl only when R3 is lower alkyl;
m is zero, one or two;
n is one, two or three;
p and q are each one or two provided that both are not two;
t is two or three;
R9 and R10 are both hydrogen, both lower alkyl, or one is hydrogen and the other is lower alkyl;
R5 is hydrogen, a hydrolyzably removable protecting, a chemically removable protecting group, or provided that neither R3 or R4 is -(CH2)n-SH
HA180a characterized by:
(1) coupling a substituted proline or pipecolic acid of the formula with an acid of the formula wherein R5 is hydrogen or a hydrolyzably or chemically removable protecting group, or (2) treating a compound of the formula wherein R5 is hereinabove defined with alcohols or thiols selected from the group consisting of R1X1H
R2X2H and to form a product wherein R5 is hydrogen or a hydrolyzably or chemically removable protecting group, and removing said protecting group to form a product wherein R5 is hydrogen, and oxidizing said products wherein R5 is hydrogen to form the product wherein R5 is
2. The process of claim 1 wherein p and q are both one; R1 and R2 each is lower alkyl of 1 to 4 carbons or form two joined methylene groups; R3 and R4 each is hydrogen or lower alkyl of 1 to 4 carbons; R5 is hydrogen, lower alkanoyl of 1 to 4 carbons, or benzoyl; R6 is hydrogen, and m is zero or one.
3. The process of claim 1 wherein X1 and X2 each is oxygen; R, R4, R5 and R6 each is hydrogen; R1 and R2 each is lower alkyl of 1 to 4 carbons or R1 and R2 each is methylene and join to complete the ethylenedioxy ring;
R3 is methyl; and m is one.
R3 is methyl; and m is one.
4. The process of claim l wherein X1-R1 and X2-R2 complete an ethylenedioxy ring.
5. The process of claim 1 wherein R is hydrogen;
R4 is hydrogen; R3 and R6 are both lower alkyl of 1 to 4 carbons or R6 is hydrogen and R3 is hydrogen, lower alkyl of 1 to 4 carbons, trifluoromethyl, methylthio, or mercaptomethyl; R5 is hydrogen, lower alkanoyl of 1 to 4 carbons, or benzoyl; X1 and X2 are the same; and R1 and R2 are lower alkyl of 1 to 4 carbons.
HA180a
R4 is hydrogen; R3 and R6 are both lower alkyl of 1 to 4 carbons or R6 is hydrogen and R3 is hydrogen, lower alkyl of 1 to 4 carbons, trifluoromethyl, methylthio, or mercaptomethyl; R5 is hydrogen, lower alkanoyl of 1 to 4 carbons, or benzoyl; X1 and X2 are the same; and R1 and R2 are lower alkyl of 1 to 4 carbons.
HA180a
6. The process of claim 1 wherein R, R4, R5 and R6 are hydrogen; R3 is methyl; m is one; and R
and R2 are both methyl or ethyl.
and R2 are both methyl or ethyl.
7. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-dimethoxy-L-proline to form (S)-1-(3-mercapto-2-methyl-1-oxo-propyl)-4,4-dimethoxy-L-proline.
8. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-diethoxy-L-proline to form (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-diethoxy-L-proline.
9. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-ethylenedioxy-L-proline to form [7(S),8(S)]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid.
10. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-trimethylene-dioxy-L-proline to form [2(S),3S]-2-(3-mercapto-2-methyl-l-oxopropyl),-6,10-dioxo-2-azaspirol4.5]deccane-3-carboxylic acid.
11. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-ethylenedithio-L-proline to form [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-7-aza-1,4-dithiaspirol4.4]nonane-8-carboxylic acid.
12. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-(1-methylene-dioxy)-L-proline to form [7(S),8S]-7-(3-mercapto-2-methyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid.
13. The process of claim 1 wherein 3-mercapto-2-trifluoromethyl-propionic acid is coupled with 4,4-ethylenedioxy-L-proline to form (8S)-7-(3-mercapto-2-trifluoromethyl-l-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]-nonane-8-carboxylic acid.
14. The process of claim 1 wherein 3-mercapto-2-methyl-propionic acid is coupled with 4,4-ethylenedioxy-L-proline to form 17(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid which is then oxidized to form (S,S,S,S)-7,7l--[dithiobist2-methyl-1-oxo-3,1-propanediyl)]bis(1,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylic acid. 100 HA180a
15. A compound of the formula or a pharmaceutically acceptable salt thereof, wherein R is hydrogen or lower alkyl;
Rl and R2 are independently selected from the group consisting of lower alkyl, or R1 and R2 join together in a polymethylene chain of the formula Xl and X2 are independently selected from the group consisting of oxygen and sulfur;
R3 and R4 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkylthio, -(CH2)n-SH, and halo substituted lower alkyl;
R6 is hydrogen or lower alkyl provided that R6 is lower alkyl only when R3 is lower alkyl;
m is zero, one or two;
n is one, two or three;
p and q are each one or two provided that both are not two;
t is two or three;
Rg and R1o are both hydrogen, both lower alkyl, or one is hydrogen and the other is lower alkyl;
R5 is hydrogen, a hydrolyzably removable protecting, a chemically removable protecting group, or provided that neither R3 or R4 is -(CH2)n-SH
HA180a whenever prepared by the process of claim 1.
Rl and R2 are independently selected from the group consisting of lower alkyl, or R1 and R2 join together in a polymethylene chain of the formula Xl and X2 are independently selected from the group consisting of oxygen and sulfur;
R3 and R4 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkylthio, -(CH2)n-SH, and halo substituted lower alkyl;
R6 is hydrogen or lower alkyl provided that R6 is lower alkyl only when R3 is lower alkyl;
m is zero, one or two;
n is one, two or three;
p and q are each one or two provided that both are not two;
t is two or three;
Rg and R1o are both hydrogen, both lower alkyl, or one is hydrogen and the other is lower alkyl;
R5 is hydrogen, a hydrolyzably removable protecting, a chemically removable protecting group, or provided that neither R3 or R4 is -(CH2)n-SH
HA180a whenever prepared by the process of claim 1.
16. A compound according to claim 15 wherein p and q are both one; R1 and R2 each is lower alkyl of 1 to 4 carbons or form two joined methylene groups; R3 and R4 each is hydrogen or lower alkyl of 1 to 4 carbons; R5 is hydrogen, lower alkanoyl of 1 to 4 carbons, or benzoyl; R6 is hydrogen, and m is zero or one, whenever prepared by the process of claim 2.
17. A compound according to claim 15 wherein X1 and X2 each is oxygen; R, R4, R5 and R6 each is hydrogen; R1 and R2 each is lower alkyl of 1 to 4 carbons or R1 and R2 each is methylene and join to complete the ethylenedioxy ring; R3 is methyl; and m is one, whenever prepared by the process of claim 3.
18. A compound according to claim 15 wherein X1-R1 and X2-R2 complete an ethylenedioxy ring, whenever prepared by the process of claim 4.
19. A compound according to claim 15 wherein R is hydrogen;
R4 is hydrogen; R3 and R6 are both lower alkyl of 1 to 4 carbons or R6 is hydrogen and R3 is hydrogen, lower alkyl of 1 to 4 carbons, trifluoromethyl, methylthio, or mercaptomethyl; R5 is hydrogen, lower alkanoyl of 1 to 4 carbons or benzoyl; X
and X2 are the same; and R1 and R2 are lower alkyl of 1 to 4 carbons, whenever prepared by the process of claim 5.
R4 is hydrogen; R3 and R6 are both lower alkyl of 1 to 4 carbons or R6 is hydrogen and R3 is hydrogen, lower alkyl of 1 to 4 carbons, trifluoromethyl, methylthio, or mercaptomethyl; R5 is hydrogen, lower alkanoyl of 1 to 4 carbons or benzoyl; X
and X2 are the same; and R1 and R2 are lower alkyl of 1 to 4 carbons, whenever prepared by the process of claim 5.
20. A compound according to claim 15 wherein R, R4, R5, and R6 are hydrogen; R3 is methyl; m is one; and R1 and R2 are both methyl or ethyl, whenever prepared by the process of claim 6.
21. A compound according to claim 15 having the name (S)-1-(3 -mercapto- 2 -methyl-1-oxopropyl)-4,4-dimethoxy-L-proline, whenever prepared by the process of claim 7.
HA180a
HA180a
22. The compound according to claim 15 having the name (S)-1-(3-mercapto-2-methyl-1-oxopropyl)-4,4-diethoxy-L-proline, whenever prepared by the process of claim 8.
23. A compound according to claim 15 having the name [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, whenever prepared by the process of claim 9.
24. A compound according to claim 15 having the name [2(S),3S]-2-(3-mercapto-2-methyl-1-oxopropyl)-6,10-dioxo-2-azaspirol4.5]decane-3-carboxylic acid, whenever prepared by the process of claim 10.
25. A compound according to claim 15 having the name [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-7-aza-1,4-dithiaspiro[4.4]nonane-8-carboxylic acid, whenever prepared by the process of claim 11.
26. A compound according to claim 15 having the name [7(S),8S]-7-(3-mercapto-2-methyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-2-methyl-8-carboxylic acid, whenever prepared by the process of claim 12.
27. A compound according to claim 15 having the name (8S)-7-(3-mercapto-2-trifluoromethyl-1-oxopropyl)-1,4-dioxo-7-azaspiro[4.4]nonane-8-carboxylic acid, whenever prepared by the process of claim 13.
28. A compound according to claim 15 having the name (S,S,S,S)-7,7'-[dithiobis(2-methyl-1-oxo-3,1-propanediyl)]-bis(l,4-dioxa-7-azaspiro[4.4]nonane-8-carboxylic acid, whenever prepared by the process of claim 14.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US97231478A | 1978-12-22 | 1978-12-22 | |
US972,314 | 1978-12-22 |
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---|---|
CA1132985A true CA1132985A (en) | 1982-10-05 |
Family
ID=25519507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA341,486A Expired CA1132985A (en) | 1978-12-22 | 1979-12-07 | Ketal and thioketal derivatives of mercaptoacyl prolines |
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JP (1) | JPS5594357A (en) |
AT (1) | AT374174B (en) |
AU (1) | AU533149B2 (en) |
BE (1) | BE880815A (en) |
CA (1) | CA1132985A (en) |
CH (1) | CH642065A5 (en) |
CS (1) | CS215036B2 (en) |
DD (1) | DD148338A5 (en) |
DE (1) | DE2951200A1 (en) |
DK (1) | DK159115C (en) |
ES (2) | ES8102094A1 (en) |
FI (1) | FI70886C (en) |
FR (1) | FR2444669A1 (en) |
GB (1) | GB2039478B (en) |
GR (1) | GR78384B (en) |
HK (1) | HK15684A (en) |
HU (1) | HU179644B (en) |
IE (1) | IE49321B1 (en) |
IL (1) | IL58930A (en) |
IT (1) | IT1126841B (en) |
LU (1) | LU82023A1 (en) |
NL (1) | NL7909246A (en) |
NO (1) | NO153569C (en) |
NZ (1) | NZ192449A (en) |
PH (1) | PH19213A (en) |
PL (1) | PL133414B1 (en) |
PT (1) | PT70620A (en) |
SE (1) | SE451839B (en) |
SU (1) | SU1115668A3 (en) |
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Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2455585A1 (en) * | 1979-05-04 | 1980-11-28 | Ono Pharmaceutical Co | OXOAMINOACID DERIVATIVES, MANUFACTURING METHOD AND PHARMACEUTICAL COMPOSITION |
US4288368A (en) * | 1979-07-30 | 1981-09-08 | E. R. Squibb & Sons, Inc. | Dithioacylproline derivatives |
US4291040A (en) * | 1979-10-22 | 1981-09-22 | E. R. Squibb & Sons, Inc. | Mercaptoacyl derivatives of 4-disubstituted prolines and 4-substituted dehydroprolines |
US4356182A (en) * | 1979-10-22 | 1982-10-26 | E. R. Squibb & Sons, Inc. | Mercaptoacyl derivatives of 4-disubstituted prolines |
HU184082B (en) * | 1979-12-29 | 1984-06-28 | Egyt Gyogyszervegyeszeti Gyar | Process for preparing 1-3-/3mercapto-/2s/-methyl-propinyl/-pyrrolidine-/2s/-carboxylic acid |
US4284624A (en) | 1980-05-02 | 1981-08-18 | E. R. Squibb & Sons, Inc. | Mixed disulfides |
US4316905A (en) * | 1980-07-01 | 1982-02-23 | E. R. Squibb & Sons, Inc. | Mercaptoacyl derivatives of various 4-substituted prolines |
US4311705A (en) * | 1980-10-06 | 1982-01-19 | E. R. Squibb & Sons, Inc. | Carboxyalkanoyl and hydroxycarbamoylalkanoyl derivatives of substituted prolines |
US4462943A (en) * | 1980-11-24 | 1984-07-31 | E. R. Squibb & Sons, Inc. | Carboxyalkyl amino acid derivatives of various substituted prolines |
US4416831A (en) | 1981-04-27 | 1983-11-22 | E. R. Squibb & Sons, Inc. | Amino and substituted amino phosphinylalkanoyl compounds |
US4374131A (en) | 1981-04-27 | 1983-02-15 | E. R. Squibb & Sons, Inc. | Amino and substituted amino phosphinyl-alkanoyl compounds |
US4381297A (en) | 1981-05-04 | 1983-04-26 | E. R. Squibb & Sons, Inc. | Substituted carbonyl phosphinyl-alkanoyl compounds |
US4416833A (en) | 1981-05-04 | 1983-11-22 | E. R. Squibb & Sons, Inc. | Substituted carbonyl phosphinyl-alkanoyl compounds |
US4555506A (en) * | 1981-12-24 | 1985-11-26 | E. R. Squibb & Sons, Inc. | Phosphorus containing compounds and use as hypotensives |
US4452791A (en) * | 1982-03-15 | 1984-06-05 | E. R. Squibb & Sons, Inc. | Aminoalkyl and related substituted phosphinic acid angiotensin converting enzyme inhibitors |
US4560680A (en) * | 1982-03-15 | 1985-12-24 | E. R. Squibb & Sons, Inc. | Aminoalkyl and related substituted phosphinic acid angiotensin converting enzyme inhibitors |
ZA832762B (en) * | 1982-04-30 | 1983-12-28 | Squibb & Sons Inc | Substituted 4-phenoxy prolines |
US4452790A (en) * | 1982-06-23 | 1984-06-05 | E. R. Squibb & Sons, Inc. | Phosphonyl hydroxyacyl amino acid derivatives as antihypertensives |
US4703043A (en) * | 1982-06-23 | 1987-10-27 | E. R. Squibb & Sons, Inc. | Phosphonyl hydroxyacyl amino acid derivatives as antihypertensive |
US4616005A (en) * | 1982-06-23 | 1986-10-07 | E. R. Squibb & Sons, Inc. | Phosphonyl hydroxyacyl amino acid derivatives as antihypertensives |
US4567166A (en) * | 1982-07-14 | 1986-01-28 | E. R. Squibb & Sons, Inc. | Amino and substituted amino phosphinylalkanoyl compounds useful for treating hypertension |
US4709046A (en) * | 1983-05-09 | 1987-11-24 | E. R. Squibb & Sons, Inc. | Acylmercaptoalkanoyl and mercaptoalkanoyl spiro compounds |
AU632596B2 (en) * | 1989-08-21 | 1993-01-07 | E.R. Squibb & Sons, Inc. | Phosphonate substituted amino or imino acids useful as antihypertensives |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4046889A (en) * | 1976-02-13 | 1977-09-06 | E. R. Squibb & Sons, Inc. | Azetidine-2-carboxylic acid derivatives |
US4091024A (en) * | 1976-12-03 | 1978-05-23 | E. R. Squibb & Sons, Inc. | Pyrrolidine and piperidine-2-carboxylic acid derivatives |
IT7851510A0 (en) * | 1977-10-28 | 1978-10-16 | Sandoz Ag | AMIDES OF CYCLIC AMINO ACIDS THEIR PREPARATION AND THEIR APPLICATION AS MEDICINES |
PH15381A (en) * | 1978-02-21 | 1982-12-17 | Squibb & Sons Inc | Halogen substituted mercaptoacylamino acids |
CA1144930A (en) * | 1978-08-11 | 1983-04-19 | Miguel A. Ondetti | Mercaptoacyl derivatives of substituted prolines |
-
1979
- 1979-12-07 CA CA341,486A patent/CA1132985A/en not_active Expired
- 1979-12-11 ZA ZA00796720A patent/ZA796720B/en unknown
- 1979-12-11 AU AU53714/79A patent/AU533149B2/en not_active Ceased
- 1979-12-12 IL IL58930A patent/IL58930A/en unknown
- 1979-12-13 GR GR60746A patent/GR78384B/el unknown
- 1979-12-13 GB GB7942991A patent/GB2039478B/en not_active Expired
- 1979-12-17 CS CS798891A patent/CS215036B2/en unknown
- 1979-12-18 NZ NZ192449A patent/NZ192449A/en unknown
- 1979-12-19 PH PH23434A patent/PH19213A/en unknown
- 1979-12-19 DE DE19792951200 patent/DE2951200A1/en not_active Ceased
- 1979-12-19 FR FR7931132A patent/FR2444669A1/en active Granted
- 1979-12-19 NO NO794181A patent/NO153569C/en unknown
- 1979-12-19 IE IE2468/79A patent/IE49321B1/en unknown
- 1979-12-20 CH CH1133979A patent/CH642065A5/en not_active IP Right Cessation
- 1979-12-20 AT AT0805479A patent/AT374174B/en active
- 1979-12-20 SE SE7910550A patent/SE451839B/en not_active IP Right Cessation
- 1979-12-21 IT IT51167/79A patent/IT1126841B/en active
- 1979-12-21 ES ES487180A patent/ES8102094A1/en not_active Expired
- 1979-12-21 BE BE0/198709A patent/BE880815A/en not_active IP Right Cessation
- 1979-12-21 DD DD79218061A patent/DD148338A5/en not_active IP Right Cessation
- 1979-12-21 FI FI794027A patent/FI70886C/en not_active IP Right Cessation
- 1979-12-21 DK DK550079A patent/DK159115C/en not_active IP Right Cessation
- 1979-12-21 LU LU82023A patent/LU82023A1/en unknown
- 1979-12-21 NL NL7909246A patent/NL7909246A/en not_active Application Discontinuation
- 1979-12-21 PL PL1979220609A patent/PL133414B1/en unknown
- 1979-12-21 SU SU792860149A patent/SU1115668A3/en active
- 1979-12-21 PT PT70620A patent/PT70620A/en unknown
- 1979-12-21 YU YU03148/79A patent/YU314879A/en unknown
- 1979-12-21 HU HU79SU1047A patent/HU179644B/en not_active IP Right Cessation
- 1979-12-22 JP JP16747179A patent/JPS5594357A/en active Pending
-
1980
- 1980-02-20 ES ES488752A patent/ES488752A0/en active Granted
-
1984
- 1984-02-23 HK HK156/84A patent/HK15684A/en unknown
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