WO2014128719A2 - Processes for the preparation of bispyribac sodium and intermediates thereof - Google Patents
Processes for the preparation of bispyribac sodium and intermediates thereof Download PDFInfo
- Publication number
- WO2014128719A2 WO2014128719A2 PCT/IN2014/000087 IN2014000087W WO2014128719A2 WO 2014128719 A2 WO2014128719 A2 WO 2014128719A2 IN 2014000087 W IN2014000087 W IN 2014000087W WO 2014128719 A2 WO2014128719 A2 WO 2014128719A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- mixture
- mass
- sodium
- pyrimidine
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000002360 preparation method Methods 0.000 title claims abstract description 46
- FUHMZYWBSHTEDZ-UHFFFAOYSA-M bispyribac-sodium Chemical compound [Na+].COC1=CC(OC)=NC(OC=2C(=C(OC=3N=C(OC)C=C(OC)N=3)C=CC=2)C([O-])=O)=N1 FUHMZYWBSHTEDZ-UHFFFAOYSA-M 0.000 title claims abstract description 45
- 239000000543 intermediate Substances 0.000 title description 5
- AKEUNCKRJATALU-UHFFFAOYSA-N 2,6-dihydroxybenzoic acid Chemical compound OC(=O)C1=C(O)C=CC=C1O AKEUNCKRJATALU-UHFFFAOYSA-N 0.000 claims abstract description 100
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002904 solvent Substances 0.000 claims abstract description 19
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 114
- 239000000203 mixture Substances 0.000 claims description 92
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims description 76
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 53
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 48
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 36
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 36
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 claims description 36
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 33
- UIAFKZKHHVMJGS-UHFFFAOYSA-N 2,4-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1O UIAFKZKHHVMJGS-UHFFFAOYSA-N 0.000 claims description 30
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 28
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical group [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims description 28
- 239000007787 solid Substances 0.000 claims description 28
- 239000001569 carbon dioxide Substances 0.000 claims description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000002253 acid Substances 0.000 claims description 21
- 239000000706 filtrate Substances 0.000 claims description 20
- 229940114055 beta-resorcylic acid Drugs 0.000 claims description 19
- MZGVIIXFGJCRDR-UHFFFAOYSA-N 4,6-dihydroxybenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(O)C=C1O MZGVIIXFGJCRDR-UHFFFAOYSA-N 0.000 claims description 18
- ITDVJJVNAASTRS-UHFFFAOYSA-N 4,6-dimethoxy-2-methylsulfonylpyrimidine Chemical group COC1=CC(OC)=NC(S(C)(=O)=O)=N1 ITDVJJVNAASTRS-UHFFFAOYSA-N 0.000 claims description 18
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical group ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 claims description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 16
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 16
- RVBUGGBMJDPOST-UHFFFAOYSA-N 2-thiobarbituric acid Chemical compound O=C1CC(=O)NC(=S)N1 RVBUGGBMJDPOST-UHFFFAOYSA-N 0.000 claims description 15
- URSYQIBBJXLQBW-UHFFFAOYSA-N 4,6-dimethoxy-2-methylsulfanylpyrimidine Chemical group COC1=CC(OC)=NC(SC)=N1 URSYQIBBJXLQBW-UHFFFAOYSA-N 0.000 claims description 15
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 15
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 15
- AEXCUJUYEZIWJV-UHFFFAOYSA-N 4-hydroxy-2-methylsulfanyl-1h-pyrimidin-6-one Chemical group CSC1=NC(O)=CC(=O)N1 AEXCUJUYEZIWJV-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- FCMLONIWOAGZJX-UHFFFAOYSA-N 4,6-dichloro-2-methylsulfanylpyrimidine Chemical group CSC1=NC(Cl)=CC(Cl)=N1 FCMLONIWOAGZJX-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- -1 sodium alkoxide Chemical class 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 claims description 12
- BEPAFCGSDWSTEL-UHFFFAOYSA-N dimethyl malonate Chemical compound COC(=O)CC(=O)OC BEPAFCGSDWSTEL-UHFFFAOYSA-N 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 11
- 159000000000 sodium salts Chemical class 0.000 claims description 11
- OFOBLEOULBTSOW-UHFFFAOYSA-L Malonate Chemical compound [O-]C(=O)CC([O-])=O OFOBLEOULBTSOW-UHFFFAOYSA-L 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 10
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 9
- 229940050176 methyl chloride Drugs 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 8
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 8
- 239000012312 sodium hydride Substances 0.000 claims description 8
- 229910000104 sodium hydride Inorganic materials 0.000 claims description 8
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 8
- 230000021523 carboxylation Effects 0.000 claims description 7
- 238000006473 carboxylation reaction Methods 0.000 claims description 7
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 6
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 6
- 239000011874 heated mixture Substances 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 6
- 150000001348 alkyl chlorides Chemical class 0.000 claims description 5
- 238000004821 distillation Methods 0.000 claims description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- 229910021591 Copper(I) chloride Inorganic materials 0.000 claims description 4
- 239000000460 chlorine Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 claims description 4
- 229940045803 cuprous chloride Drugs 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 235000009518 sodium iodide Nutrition 0.000 claims description 4
- LTMRRSWNXVJMBA-UHFFFAOYSA-L 2,2-diethylpropanedioate Chemical compound CCC(CC)(C([O-])=O)C([O-])=O LTMRRSWNXVJMBA-UHFFFAOYSA-L 0.000 claims description 3
- CSDQQAQKBAQLLE-UHFFFAOYSA-N 4-(4-chlorophenyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridine Chemical compound C1=CC(Cl)=CC=C1C1C(C=CS2)=C2CCN1 CSDQQAQKBAQLLE-UHFFFAOYSA-N 0.000 claims description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 3
- SUAKHGWARZSWIH-UHFFFAOYSA-N N,N‐diethylformamide Chemical compound CCN(CC)C=O SUAKHGWARZSWIH-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- 230000001476 alcoholic effect Effects 0.000 claims description 3
- 125000004390 alkyl sulfonyl group Chemical group 0.000 claims description 3
- 238000006114 decarboxylation reaction Methods 0.000 claims description 3
- NFKGQHYUYGYHIS-UHFFFAOYSA-N dibutyl propanedioate Chemical compound CCCCOC(=O)CC(=O)OCCCC NFKGQHYUYGYHIS-UHFFFAOYSA-N 0.000 claims description 3
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 claims description 3
- 229940113088 dimethylacetamide Drugs 0.000 claims description 3
- LWIWFCDNJNZEKB-UHFFFAOYSA-N dipropyl propanedioate Chemical compound CCCOC(=O)CC(=O)OCCC LWIWFCDNJNZEKB-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- NTTOTNSKUYCDAV-UHFFFAOYSA-N potassium hydride Chemical compound [KH] NTTOTNSKUYCDAV-UHFFFAOYSA-N 0.000 claims description 3
- 229910000105 potassium hydride Inorganic materials 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 3
- 239000001117 sulphuric acid Substances 0.000 claims description 3
- 235000011149 sulphuric acid Nutrition 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 3
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 claims description 3
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 claims description 3
- 230000002152 alkylating effect Effects 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 25
- 238000004128 high performance liquid chromatography Methods 0.000 description 24
- 239000000243 solution Substances 0.000 description 22
- 239000002585 base Substances 0.000 description 16
- 239000011541 reaction mixture Substances 0.000 description 13
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 12
- 235000012970 cakes Nutrition 0.000 description 8
- 238000010992 reflux Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- 239000000839 emulsion Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000005660 chlorination reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- NHGXDBSUJJNIRV-UHFFFAOYSA-M tetrabutylammonium chloride Chemical compound [Cl-].CCCC[N+](CCCC)(CCCC)CCCC NHGXDBSUJJNIRV-UHFFFAOYSA-M 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 2
- 108010000700 Acetolactate synthase Proteins 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical group [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- MCRWZBYTLVCCJJ-DKALBXGISA-N [(1s,3r)-3-[[(3s,4s)-3-methoxyoxan-4-yl]amino]-1-propan-2-ylcyclopentyl]-[(1s,4s)-5-[6-(trifluoromethyl)pyrimidin-4-yl]-2,5-diazabicyclo[2.2.1]heptan-2-yl]methanone Chemical compound C([C@]1(N(C[C@]2([H])C1)C(=O)[C@@]1(C[C@@H](CC1)N[C@@H]1[C@@H](COCC1)OC)C(C)C)[H])N2C1=CC(C(F)(F)F)=NC=N1 MCRWZBYTLVCCJJ-DKALBXGISA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000007514 bases Chemical class 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000002363 herbicidal effect Effects 0.000 description 2
- 239000004009 herbicide Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006198 methoxylation reaction Methods 0.000 description 2
- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 description 2
- 235000011151 potassium sulphates Nutrition 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 2
- 230000009885 systemic effect Effects 0.000 description 2
- QIVUCLWGARAQIO-OLIXTKCUSA-N (3s)-n-[(3s,5s,6r)-6-methyl-2-oxo-1-(2,2,2-trifluoroethyl)-5-(2,3,6-trifluorophenyl)piperidin-3-yl]-2-oxospiro[1h-pyrrolo[2,3-b]pyridine-3,6'-5,7-dihydrocyclopenta[b]pyridine]-3'-carboxamide Chemical compound C1([C@H]2[C@H](N(C(=O)[C@@H](NC(=O)C=3C=C4C[C@]5(CC4=NC=3)C3=CC=CN=C3NC5=O)C2)CC(F)(F)F)C)=C(F)C=CC(F)=C1F QIVUCLWGARAQIO-OLIXTKCUSA-N 0.000 description 1
- GLDQAMYCGOIJDV-UHFFFAOYSA-N 2,3-dihydroxybenzoic acid Chemical group OC(=O)C1=CC=CC(O)=C1O GLDQAMYCGOIJDV-UHFFFAOYSA-N 0.000 description 1
- UXHQLGLGLZKHTC-CUNXSJBXSA-N 4-[(3s,3ar)-3-cyclopentyl-7-(4-hydroxypiperidine-1-carbonyl)-3,3a,4,5-tetrahydropyrazolo[3,4-f]quinolin-2-yl]-2-chlorobenzonitrile Chemical compound C1CC(O)CCN1C(=O)C1=CC=C(C=2[C@@H]([C@H](C3CCCC3)N(N=2)C=2C=C(Cl)C(C#N)=CC=2)CC2)C2=N1 UXHQLGLGLZKHTC-CUNXSJBXSA-N 0.000 description 1
- FNYLFWGITLMOHA-UHFFFAOYSA-N 4-chloro-6-methoxy-2-methylsulfanylpyrimidine Chemical compound COC1=CC(Cl)=NC(SC)=N1 FNYLFWGITLMOHA-UHFFFAOYSA-N 0.000 description 1
- OCULWLWEMIDGNG-UHFFFAOYSA-N 4-methoxy-2-methylsulfanyl-1h-pyrimidin-6-one Chemical compound COC1=CC(O)=NC(SC)=N1 OCULWLWEMIDGNG-UHFFFAOYSA-N 0.000 description 1
- RSIWALKZYXPAGW-NSHDSACASA-N 6-(3-fluorophenyl)-3-methyl-7-[(1s)-1-(7h-purin-6-ylamino)ethyl]-[1,3]thiazolo[3,2-a]pyrimidin-5-one Chemical compound C=1([C@@H](NC=2C=3N=CNC=3N=CN=2)C)N=C2SC=C(C)N2C(=O)C=1C1=CC=CC(F)=C1 RSIWALKZYXPAGW-NSHDSACASA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000722731 Carex Species 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 241000192043 Echinochloa Species 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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 1
- 241000124008 Mammalia Species 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- GZMYLSJUNSCMTD-MOPGFXCFSA-N OC[C@@H](C)NC1=NC(=CC(=C1)C=1C=C(C=CC=1C)NC(=O)N1C[C@@H](CC1)CC(F)(F)F)N1CCOCC1 Chemical compound OC[C@@H](C)NC1=NC(=CC(=C1)C=1C=C(C=CC=1C)NC(=O)N1C[C@@H](CC1)CC(F)(F)F)N1CCOCC1 GZMYLSJUNSCMTD-MOPGFXCFSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000209504 Poaceae Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical class [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- AUJRJIUUUUYHAN-UHFFFAOYSA-N azane 9-chloro-9-octylheptadecane Chemical compound N.CCCCCCCCC(Cl)(CCCCCCCC)CCCCCCCC AUJRJIUUUUYHAN-UHFFFAOYSA-N 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- SBTSVTLGWRLWOD-UHFFFAOYSA-L copper(ii) triflate Chemical compound [Cu+2].[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F SBTSVTLGWRLWOD-UHFFFAOYSA-L 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 235000021463 dry cake Nutrition 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000001640 fractional crystallisation Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000004170 methylsulfonyl group Chemical group [H]C([H])([H])S(*)(=O)=O 0.000 description 1
- XKBGEWXEAPTVCK-UHFFFAOYSA-M methyltrioctylammonium chloride Chemical compound [Cl-].CCCCCCCC[N+](C)(CCCCCCCC)CCCCCCCC XKBGEWXEAPTVCK-UHFFFAOYSA-M 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- ABMDIECEEGFXNC-UHFFFAOYSA-N n-ethylpropanamide Chemical compound CCNC(=O)CC ABMDIECEEGFXNC-UHFFFAOYSA-N 0.000 description 1
- XULSCZPZVQIMFM-IPZQJPLYSA-N odevixibat Chemical compound C12=CC(SC)=C(OCC(=O)N[C@@H](C(=O)N[C@@H](CC)C(O)=O)C=3C=CC(O)=CC=3)C=C2S(=O)(=O)NC(CCCC)(CCCC)CN1C1=CC=CC=C1 XULSCZPZVQIMFM-IPZQJPLYSA-N 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- FAIAAWCVCHQXDN-UHFFFAOYSA-N phosphorus trichloride Chemical compound ClP(Cl)Cl FAIAAWCVCHQXDN-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- HIAIVILTZQDDNY-UHFFFAOYSA-J tin(4+);trifluoromethanesulfonate Chemical compound [Sn+4].[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F HIAIVILTZQDDNY-UHFFFAOYSA-J 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical class OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- FIQMHBFVRAXMOP-UHFFFAOYSA-N triphenylphosphane oxide Chemical compound C=1C=CC=CC=1P(C=1C=CC=CC=1)(=O)C1=CC=CC=C1 FIQMHBFVRAXMOP-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
- C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/60—Three or more oxygen or sulfur atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
- C07D239/32—One oxygen, sulfur or nitrogen atom
- C07D239/38—One sulfur atom
Definitions
- the present disclosure relates to processes for the preparation of Bispyribac sodium and intermediates thereof.
- Mode of action selective, systemic action post-emergence herbicide, absorbed by foliage and roots.
- Bispyribac sodium is a systemic herbicide that moves throughout the plant tissue and works by interfering with production of a plant enzyme necessary for growth, acetolactate synthase (ALS). It is used to control grasses, sedges and broad-leaved weeds, especially Echinochloa spp., in direct seeded rice. It is also used to stunt growth of weeds in non-crop situations.
- Bispyribac sodium is broken down by microbes and has a half-life (the time it takes for half of the active ingredient to degrade) of 42-1 15 days.
- the primary degradation product of bispyribac sodium is sodium 2-(4,6 dimethoxypyrimidin-2-yl)oxy-6-(4-hydroxy-6- methoxypyrimidin-2-yl) benzoate.
- Bispyribac sodium does not bind to soil, is moderately persistent and somewhat mobile through the soil. Testing indicates that the aquatic formulation of bispyribac sodium is non-toxic to fish and invertebrates. Bispyribac sodium is also non-toxic to both birds and mammals.
- WO2000046212 discloses preparation of 4.6-dimethoxy-2- (methylsulphonyl) pyrimidine.
- the process involves mixing 2-methylthiobarbituric acid in xylene, triphenylphosphine oxide and tetrabutylammonium chloride followed by heating and passing phosgene until reaction of the adduct is complete.
- phosgene is removed from the reaction mass followed by extracting the organic phase with water and reacting with sodium methylate at 50°C to form 4,6-dimethoxy-2-methylthiopyrimidine.
- 5 mol% of sodium tungstate and 5 mol% of tetrabutylammonium chloride are added to the reaction mixture and mixed at 85°C with 2 molar equivalents of hydrogen peroxide.
- WO2002008207 discloses a process for preparing 4, 6-dimethoxy- 2- (methylsulfonyl) -1, 3- pyrimidine by reacting 4,6- dichloro-2- (methylthio) -1, 3-pyrimidine in an inert organic solvent with an alkali metal methoxide, transfer of the resulting 4, 6-dimethoxy-2- (methylthio) - 1, 3-pyrimidine into an aqueous-acidic medium and subsequent oxidation of this compound, in the presence of tricaprylmethylammonium chloride as a catalyst, wherein the oxidation is followed by a purification step in which the aqueous- acidic reaction mixture is adjusted with aqueous base to a pH in the range of 5-8 and stirred either in the presence or in the absence of an organic solvent.
- CN 101747283 discloses a method for the preparation of 4,6-dimethoxy-2-(methanesulfonyl) pyrimidine which involves chlorination of 4,6-dihydroxy-2-(methylthio)pyrimidine to obtain 4,6-dichloro-2-(methylthio)pyrimidine which on methoxylation gives 4,6-dimethoxy-2- (methylthio)pyrimidine followed by oxidation.
- the process disclosed in CN 101747283 particularly employs trifluoromethane sulfonic acid salt, quaternary ammonium salt or organic bases catalyst in methoxylation reaction.
- the catalyst is selected from the group consisting of copper trifluoromethane sulfonate, trifluoromethane sulfonate, tin trifluoromethyl sulfonate, trioctyl methyl chloride ammonium, tertiary ammonium chloride and triethylamine.
- GB 9165481963 discloses the synthesis of 2, 6-dihydroxybenzoic acid by carboxylating andydrous mono-potassium salt of resorcinol, at 130 °C, in the presence of a solvent having the formula RCON ⁇ 1 ⁇ , where R is hydrogen or a lower alkyl group and R 1 is a lower alkyl group having 1 to 4 carbon atoms.
- R is hydrogen or a lower alkyl group and R 1 is a lower alkyl group having 1 to 4 carbon atoms.
- N, N'-dimethylformamide and N, N'-diethylformamide are the preferable solvents choices.
- An alkali salt of resorcinol may be formed in situ by reacting resorcinol with alkali metal hydroxide, carbonate or bicarbonate. Isolation of 2, 6- dihydroxybenzoic acid is effected by acidification with hydrochloric acid followed by fractional crystallization.
- US 5304677 discloses synthesis of 2, 6-dihydroxybenzoic acid by dissolving resorcinol in a suitable solvent followed by blowing carbon dioxide into the solution in the presence of a basic compound until the absorption of carbon dioxide ceases.
- Alcohols, alkoxy-alcohols, dimethylformamide, water and mixtures thereof may be used as solvents.
- the basic compound may be potassium carbonate, potassium hydroxide or sodium carbonate and is used approximately in an amount equimolar to resorcinol.
- the reaction may be carried out within a temperature range of 100 to 200 °C under atmospheric pressure or under carbon dioxide gas pressure of 30 kg/cm 2 .
- the patent also discloses decomposition of 2, 4- dihydroxybenzoic acid from the resultant mixture by acidification of the basic aqueous solution with an organic or a mineral acid to a pH between 5 and 7 and heating the mixture from 90 °C to the boiling temperature of the aqueous solution.
- sulfuric acid is added to the mixture to attain a pH of 3 which is followed by filtering off the insoluble matter.
- Sulfuric acid is further added to the filtrate until the pH value reaches 1 , after which the 2, 6-dihydroxybenzoic acid is finally isolated by filtration at 5 °C.
- Another object of the present disclosure is to provide a process for the preparation of
- Another object of the present disclosure is to provide a process for the preparation of 4,6- dialkoxy 2-(alkylsulfonyl)pyrimidine.
- Still another object of the present disclosure is to provide a simple and cost efficient process for the preparation of 4,6-dialkoxy 2-(alkylsulfonyl)pyrimidine.
- Yet another object of the present disclosure is to provide a high yielding process for the preparation of 4,6-dialkoxy 2-(alkylsulfonyl)pyrimidine.
- a further object of the present disclosure is to provide a process for the preparation of 4,6- dialkoxy 2-(alkylsulfonyl)pyrimidine of high purity. 1 It is another object of the present disclosure to provide a process for the preparation of 2, 6- dihydroxybenzoic acid.
- a process for the preparation of Bispyribac sodium comprises condensing 2,6-dihydroxy benzoic acid with 2- (alkyl sulfonyl)-4,6-dialkoxy pyrimidine at a temperature ranging between 20 and 80°C in the presence of at least one base and at least one solvent.
- the base is selected from the group consisting of sodium hydride, potassium hydride, lithium and calcium hydride
- the solvent is selected from the group consisting of tetrahydrofuran, dimethylsulfoxide, dimethylformamide, dimethyl acetamide, N-methyl pyrrolidone, sulfolane, monoglyme and diglyme.
- 2-(alkyl sulfonyl)-4,6-dialkoxy pyrimidine is 2-(methyl sulfonyl)-4,6-dimethoxy pyrimidine.
- dialkyl malonate is selected from the group consisting of dimethyi malonate, diethyl malonate, di-n-propyl malonate and di-n-butyl malonate, preferably, dialkyl malonate is dimethyl malonate.
- sodium alkoxide is sodium methoxide.
- alkyl chloride is methyl chloride.
- 2-alkyl thio-4,6-dihydroxypyrimidine is 2-methyl thio-4,6-dihydroxypyrimidine.
- 2-alkyl thio-4,6-dichloropyrimidine is 2-methyl thio-4,6-dichloropyrimidine.
- 4,6-dialkoxy-2-(alkylthio) pyrimidine is 4,6-dimethoxy-2-(methylthio) pyrimidine.
- 4,6-dialkoxy-2-(alkylsulfonyl) pyrimidine is 4,6-dimethoxy-2-(methylsulfonyl) pyrimidine.
- the alcohol is selected from the group consisting of methanol, ethanol, n-propyl alcohol and n-butyl alcohol.
- the step (i) comprises adding dimethyl malonate and thiourea to methanol to obtain a mass, heating the mass to a temperature ranging between 50 and 70°C, incorporating a methanolic solution of sodium methoxide to said mass to obtain a mixture, maintaining said mixture at a temperature ranging between 50 and 70°C for a period of 1 to 5 hours, removing methanol from said mixture by distillation to obtain a second mass, cooling said mass to obtain a cooled mass, filtering said mass to obtain a cake; and washing said cake with methanol followed by drying to obtain a sodium salt of thiobarbituric acid.
- step (ii) comprises mixing sodium salt of thiobarbituric acid with sodium hydroxide solution and methanol obtain a mass, adding methyl chloride to said mass and stirring to obtain 2-methylthio-4,6-dihydroxypyrimidine.
- step (iii) comprises mixing 2-methylthio-4,6-dihydroxypyrimidine, POCI3, at least one aromatic hydrocarbon and at least one base to obtain a mixture, heating said mixture to a temperature ranging between 40 to 90°C to obtain a heated mixture, and adding POCI3 and chlorine into said heated mixture followed by stirring at a temperature of 40 to 60° to obtain 2-methylthio-4,6-dichloropyrimidine.
- the step (iv) comprises mixing an alcoholic solution of sodium methoxide, cuprous chloride and sodium iodide to obtain a mixture, cooling said mixture followed by adding 2- methylthio-4,6-dichloropyrimidine at a temperature ranging between 15 and 25°C to obtain a mass, and heating said mass at a temperature ranging between 30 and 50 °C to obtain 4,6-dimethoxy-2-(methylthio) pyrimidine.
- step (v) comprises mixing 4,6-dimethoxy-2-(methylthio) pyrimidine, sodium tungstate and acetic acid to obtain a mixture, heating said mixture and adding hydrogen peroxide (H 2 0 2 ) to obtain 4,6-dimethoxy-2-(methylsulfonyl) pyrimidine.
- the catalyst is sodium tungstate.
- the aromatic hydrocarbon is selected from the group consisting of monochlorobenzene, o-dichlorobenzene and combination thereof.
- the base is selected from the group consisting of triethylamine, tripropylamine, tributylamine and combinations thereof.
- 6-dihydroxybenzoic acid is prepared by the following process:
- the step of carboxylation is carried out at a temperature ranging between 140 and 180 °C.
- said acid is selected from the group consisting of hydrochloric acid, sulphuric acid and acetic acid.
- said base is selected from the group consisting of potassium carbonate, potassium hydroxide, sodium carbonate and combinations thereof.
- the solvent is selected from .the group consisting of toluene, N, N- dimethylformamide, N, N-diethylformamide, ethanol, methanol, acetone, water and combinations thereof.
- the step of carboxylation is carried out in a reactor having a pressure ranging between 5 kg/cm 2 and 45 kg/cm 2 .
- the drying is carried out at a temperature ranging between 40 to 70°C.
- the purity of 2, 6-dihydroxybenzoic acid is > 99%.
- the process for the preparation of 2, 6-dihydroxybenzoic acid include the step of decarboxylation of 2, 4- dihydroxy benzoic acid and 4, 6-dihydroxyisophthalic acid to obtain resorcinol and recycling of said resorcinol.
- Figure 1 illustrates a reaction scheme for the preparation of Bispyribac-sodium in accordance with the present disclosure
- Figure 2 illustrates a reaction scheme for the preparation of 2-(alkyl sulfonyl)-4,6-dialkoxy pyrimidine.
- a process for the preparation of Bispyribac-sodium involves condensing 2,6-dihydroxy benzoic acid with 2- (alkyl sulfonyl)-4,6-dialkoxy pyrimidine at a temperature ranging between 20 and 80°C in the presence of at least one base selected from the group consisting of sodium hydride, potassium hydride, lithium and calcium hydride and at least one solvent selected from the group consisting of tetrahydrofuran, dimethylsulfoxide, dimethylformamide, dimethyl acetamide, N-methyl pyrrolidone, sulfolane, monoglyme and diglyme to obtain Bispyribac- sodium.
- 2-(alkyl sulfonyl)-4,6-dialkoxy pyrimidine employed is 2-(methyl sulfonyl)-4,6-dimethoxy pyrimidine.
- dialkyl malonate is reacted with thiourea in the presence of sodium alkoxide and an alcohol to obtain a sodium salt of thiobarbituric acid.
- dialkyl malonate is selected from the group consisting of dimethyl malonate, diethyl malonate, di-n-propyl malonate and di-n-butyl malonate. In one embodiment dialkyl malonate is dimethyl malonate.
- the alcohol is selected from the group consisting of methanol, ethanol, n-propyl alcohol and n-butyl alcohol.
- the obtained salt of thiobarbituric acid is alkylated with alkyl chloride to obtain 2-alkyl thio- 4,6-dihydroxypyrimidine.
- 2-alkylthio-4,6-dihydroxypyrimidine is subjected to chlorination using phosphoryl chloride (POCI3) to obtain 2-alkylthio-4,6-dichloropyrimidine which is then alkoxylated with sodium alkoxide to obtain 4,6-dialkoxy-2-(alkylthio) pyrimidine.
- POCI3 phosphoryl chloride
- 4,6-dialkoxy-2-(alkylthio) pyrimidine is oxidized in the presence of hydrogen peroxide, acetic acid and a catalyst and to obtain 4,6-dialkoxy-2-(alkylsulfonyl) pyrimidine.
- the catalyst employed in oxidation step is sodium tungstate.
- the present disclosure particularly provides preparation of 4,6-dimethoxy-2- (methy 1 sulfonyl)pyrimidine .
- dimethyl malonate is reacted with thiourea in the presence of sodium methoxide and methanol to obtain a sodium salt of thiobarbituric acid.
- the obtained salt of thiobarbituric acid is alkylated with methyl chloride to obtain 2-methyl thio-4,6- dihydroxypyrimidine.
- 2-methylthio-4,6-dihydroxypyrimidine is subjected to chlorination using phosphoryl chloride (POCl 3 ) to obtain 2-methylthio-4,6-dichloropyrimidine which is then alkoxylated with sodium methoxide to obtain 4,6-dimethoxy-2-(methylthio) pyrimidine.
- phosphoryl chloride POCl 3
- the preparation of a sodium salt of thiobarbituric acid involves the following steps: adding dimethyl malonate and thiourea to methanol to obtain a mass, heating the mass to a temperature ranging between 50 and 70°C,
- 2-methylthio-4,6-dichloropyrimidine involves the following steps:
- the aromatic hydrocarbon is selected from the group consisting of monochlorobenzene, o- dichlorobenzene and combination thereof and the base is selected from the group consisting of triethylamine, tripropylamine, tributylamine and combinations thereof.
- the preparation of 4,6-dimethoxy-2-(methylthio) pyrimidine involves the following steps:
- the process involves the following steps:
- resorcinol is carboxylated in the presence of carbon dioxide and at least one base in at least one solvent at a temperature ranging between 100 and ,200 °C to obtain a mixture containing 2, 6-dihydroxybenzoic acid, 2, 4-dihydroxybenzoic acid and 4, 6- dihydroxyisophthalic acid.
- the obtained mixture is acidified with at least one acid to obtain 2, 6-dihydroxybenzoic acid.
- the acidifying step involves adjusting the pH of the mixture ⁇ 1.
- the purity of 2, 6-dihydroxybenzoic acid obtained by the process of the present disclosure is > 95 %, preferably greater than 99%.
- the acid is selected from the group consisting of hydrochloric acid, sulphuric acid and acetic acid
- the base is selected from the group consisting of potassium carbonate, potassium hydroxide, sodium carbonate and combinations thereof
- the solvent is selected from the group consisting of toluene, N, N- dimethylformamide, N, N-diethylformamide, ethanol, methanol, acetone, water and combinations thereof.
- the step of carboxylation is carried out at a temperature ranging between 140 and 180 °C.
- the step of carboxylation is carried out in a reactor having a pressure ranging between 5 kg/cm 2 and 45 kg/cm 2 .
- the process involves the following steps: • carboxylating resorcinol in the presence of carbon dioxide and at least one base in at least one solvent at a temperature ranging between 100 and 200 °C to obtain a mixture containing 2, 6-dihydroxybenzoic acid, 2, 4-dihydroxybenzoic acid and 4, 6- dihydroxyisophthalic acid;
- the drying step is carried out at a temperature ranging between 40 and 70°C.
- the process include the step of decarboxylation of 2, 4- dihydroxy benzoic acid and 4, 6-dihydroxyisophthalic acid to obtain resorcinol and recycling of said resorcinol.
- Example-1
- POCl 3 was vacuum distilled and 200ml monochlorobenzene was added and continued the distillation to ensure complete removal of POCl 3 . 4.0m to 4.3m POCl 3 was recovered; the residual mass was drowned in 200ml ice water and extracted with monochlorobenzene. To the monochlorobenzene layer, 100 ml water was added and neutralized with NaHC0 3 . The layers were separated and monochlorobenzene layer was concentrated under vacuum. Yield of product was 85-87%.
- a mixture of resorcinol (110 grams, 1.0 mole), toluene (250 ml) and potassium hydroxide (65.1 grams of 86 %, 1.0 mole) was stirred in a reactor to which a Dean & Stark apparatus was installed to obtain a mass.
- the obtained mass was dehydrated by removing water from side arm of the Dean and Stark apparatus. After no more water was observed in the side arm of the Dean and Stark apparatus, toluene was completely distilled and N,N- dimethylformamide (330 ml) was added to obtain a solution.
- the resultant solution was transferred to a dry stainless steel pressure reactor, pressurized using a carbon dioxide gas and heated to 150 °C to obtain a reaction mixture.
- the obtained reaction mixture was held at 150 °C for 6 hours under a carbon dioxide gas pressure of 9 kg/cm2.
- the mixture was cooled to 50 °C, carbon dioxide pressure was released and carbon dioxide was vented into alkali scrubber. The mixture was then transferred to a glass reactor and N, N- dimethylformamide was distilled at 1 10°C liquid temperature and 10 mm Hg pressure to obtain a reaction mass. The resultant mass was cooled to ambient temperature and dissolved in water.
- the HPLC composition of the reaction mass was of 56.61 %-2,6-dihydroxybenzoic acid, 4.97 %-2,4-dihydroxybenzoic acid, 9.32 % resorcinol, 12.73% 4,6-dihydroxyisophthalic acid.
- the aqueous mass was acidified to a pH value of 5.5 to 6 with concentrated hydrochloric acid and maintained at 100 °C for 6 hours. The reaction progress was monitored by HPLC.
- a mixture of 220 grams resorcinol (2.0 mole), 1300 ml 50 % (v/v) aqueous ethanol and 276 grams (2.0 mole) potassium carbonate was added in a dry stainless steel high-pressure reactor. Reactor was pressurized to 5 kg using carbon dioxide and heated to 170 °C. The mixture was held at 170 °C for 5 hours keeping carbon dioxide pressure of 38 - 39 kg/cm 2 . The reaction mixture was cooled to ambient temperature and carbon dioxide was released and vented in alkali scrubber.
- the mixture was then transferred to a glass reactor and analyzed by HPLC.
- HPLC composition 38.43 %-2,6-dihydroxybenzoic acid, 34.6 %-2,4-dihydroxybenzoic acid,
- the reaction mixture was further maintained at reflux for 12.5 hours with adding concentrated hydrochloric acid to maintain the pH value 5.5 to 6.
- the composition of the reaction mass by HPLC was 55.25 %-2,6-dihydroxybenzoic acid, 3.6 %-2,4-dihydroxybenzoic acid, 20.35% resorcinol & 19.90 % 4,6-dihydroxyisophthalic acid.
- reaction mixture was cooled to ambient temperature, carbon dioxide was released, carbon dioxide was vented in alkali scrubber.
- the mixture was neutralized to pH 5.5 to 6 using concentrated sulfuric acid at 30 °C. Ethanol/water was then distilled from the mixture to get 98 -100 °C liquid temperature. The reaction mixture was further maintained at reflux for 11 hours by adding concentrated sulfuric acid to the reaction mixture keeping pH value 5.5 to 6 during heating.
- HPLC composition of the mass was 55.72 %-2,6-dihydroxybenzoic acid, 2.81 %-2,4-dihydroxybenzoic acid, 38.14 % resorcinol and 2.15 % 4,6-dihydroxyisophthalic acid as against initial value of 52.47 %-2,6-dihydroxybenzoic acid, 20.20 %-2,4-dihydroxybenzoic acid, 24.2 % resorcinol & 2.47 % 4,6-dihydroxyisophthalic acid).
- aqueous filtrate was mixed and extracted with methyl ethyl ketone several times.
- Combined methyl ethyl ketone extract was concentrated under reduced pressure to get 142 grams viscous mass having HPLC composition of 85.7 % resorcinol, 7.8 % -2,6-DHBA, 1.6 % 2,4-dihydroxybenzoic acid and 2.1 % 4,6-dihydroxybenzoic acid.
- the mixture was pressurized to 5 kg using carbon dioxide and heated to 170 °C, the mixture was kept at 170 °C for 5 hours with a carbon dioxide pressure of 23 - 25 kg/cm 2 .
- reaction mixture was cooled to ambient temperature, carbon dioxide was released, carbon dioxide was vented in alkali scrubber.
- the mixture was neutralized to pH 5.5 to 6 using concentrated sulfuric acid at 30 °C. Ethanol/water was then distilled from the mixture to get 98-100 °C liquid temperature. The reaction mixture was further maintained at reflux for 12 hours by adding concentrated sulfuric acid to the reaction mixture until pH value reached 5.5 to 6 during maintenance.
- the HPLC composition was 55.48 % -2,6-dihydroxybenzoic acid, 0.1 . % 2,4-dihydroxybenzoic acid, 41.04 % resorcinol and 0.93 % 4,6- dihydroxyisophthalic acid as against initial value of 35.52 % -2,6-dihydroxybenzoic acid, 30.21 % 2,4-dihydroxybenzoic acid, 26.27 % resorcinol and 6.41 % 4,6-dihydroxyisophthalic acid.
- 4,6-dihydroisophtahlic acid shows complete decarboxyaltion at 100 °C using concentrated sulfuric acid.
- Aqueous filtrate was neutralized to pH 7 using potassium carbonate & then it was treated with charcoal & filtered off charcoal.
- the content of resorcinol in aqueous filtrate was determined by HPLC and the shortfall of resorcinol for a batch size of 2.0 mole of resorcinol was compensated by adding fresh resorcinol and carboxylation was conducted as per the process given in the example 13 and 14.
- the yield of 2,6-dihydroxy benzoic acid was 33 % (use of fresh resorcinol), 35 % after first recycle of aqueous filtrate and 32 % after second recycle of aqueous filtrate.
Abstract
Description
Claims
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KR1020157025678A KR102075509B1 (en) | 2013-02-18 | 2014-02-11 | Processes for the preparation of bispyribac sodium and intermediates thereof |
CN201480009331.XA CN105026376B (en) | 2013-02-18 | 2014-02-11 | It is used to prepare the method for bispyribac-sodium sodium and its intermediate |
BR112015019795-7A BR112015019795B1 (en) | 2013-02-18 | 2014-02-11 | PROCESS FOR THE PREPARATION OF SODIUM BISPIRIBAC AND INTERMEDIARIES OF THE SAME |
JP2015557570A JP6382229B2 (en) | 2013-02-18 | 2014-02-11 | Preparation process of Bispyribac sodium salt |
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CN112354566A (en) * | 2020-10-30 | 2021-02-12 | 中北大学 | Barbituric acid-polyoxometalate hybrid and preparation method thereof |
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CN106083738A (en) * | 2016-07-06 | 2016-11-09 | 淄博新农基农药化工有限公司 | A kind of method utilizing phase transfer catalyst to prepare herbicide bispyribac-sodium |
CN112552244A (en) * | 2020-12-22 | 2021-03-26 | 内蒙古科硕新材料科技有限公司 | Production process of 4, 6-dimethoxy-2-methylsulfonyl pyrimidine |
CN112920126A (en) * | 2021-01-13 | 2021-06-08 | 新沂大江化工有限公司 | Preparation method and preparation device of bispyribac-sodium intermediate 2-methylsulfonyl 4, 6-dimethoxypyrimidine |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112354566A (en) * | 2020-10-30 | 2021-02-12 | 中北大学 | Barbituric acid-polyoxometalate hybrid and preparation method thereof |
CN112354566B (en) * | 2020-10-30 | 2023-04-21 | 中北大学 | Barbituric acid-polymetallic oxygen cluster hybrid and preparation method thereof |
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CN105026376A (en) | 2015-11-04 |
WO2014128719A3 (en) | 2014-12-24 |
CN105026376B (en) | 2018-05-11 |
KR102075509B1 (en) | 2020-02-10 |
JP2016509995A (en) | 2016-04-04 |
PH12015501798A1 (en) | 2015-11-09 |
KR20150121102A (en) | 2015-10-28 |
BR112015019795B1 (en) | 2020-06-16 |
MY177976A (en) | 2020-09-28 |
PH12015501798B1 (en) | 2015-11-09 |
JP6382229B2 (en) | 2018-08-29 |
BR112015019795A2 (en) | 2017-07-18 |
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