CN118561739A - Preparation method of 5-aminolevulinic acid hydrochloride intermediate - Google Patents
Preparation method of 5-aminolevulinic acid hydrochloride intermediate Download PDFInfo
- Publication number
- CN118561739A CN118561739A CN202410583452.0A CN202410583452A CN118561739A CN 118561739 A CN118561739 A CN 118561739A CN 202410583452 A CN202410583452 A CN 202410583452A CN 118561739 A CN118561739 A CN 118561739A
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- China
- Prior art keywords
- formula
- compound
- reaction
- acid hydrochloride
- phthalimide
- Prior art date
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- ZGXJTSGNIOSYLO-UHFFFAOYSA-N 88755TAZ87 Chemical compound NCC(=O)CCC(O)=O ZGXJTSGNIOSYLO-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 229950010481 5-aminolevulinic acid hydrochloride Drugs 0.000 title claims abstract description 101
- 238000002360 preparation method Methods 0.000 title claims abstract description 44
- 150000001875 compounds Chemical class 0.000 claims abstract description 88
- 239000007800 oxidant agent Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 40
- 230000001590 oxidative effect Effects 0.000 claims abstract description 31
- 239000007810 chemical reaction solvent Substances 0.000 claims abstract description 24
- 230000009471 action Effects 0.000 claims abstract description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 203
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 97
- 238000006243 chemical reaction Methods 0.000 claims description 86
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 40
- 239000012425 OXONE® Substances 0.000 claims description 34
- 229910052739 hydrogen Inorganic materials 0.000 claims description 34
- 239000001257 hydrogen Substances 0.000 claims description 34
- HJKYXKSLRZKNSI-UHFFFAOYSA-I pentapotassium;hydrogen sulfate;oxido sulfate;sulfuric acid Chemical compound [K+].[K+].[K+].[K+].[K+].OS([O-])(=O)=O.[O-]S([O-])(=O)=O.OS(=O)(=O)O[O-].OS(=O)(=O)O[O-] HJKYXKSLRZKNSI-UHFFFAOYSA-I 0.000 claims description 31
- 150000003839 salts Chemical class 0.000 claims description 29
- 239000000243 solution Substances 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 26
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 22
- 238000007254 oxidation reaction Methods 0.000 claims description 21
- 239000003960 organic solvent Substances 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 17
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 17
- 239000007864 aqueous solution Substances 0.000 claims description 15
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 9
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 9
- 239000003377 acid catalyst Substances 0.000 claims description 8
- 238000005903 acid hydrolysis reaction Methods 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 238000005984 hydrogenation reaction Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 6
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims description 6
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 claims description 5
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims description 4
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 229940098779 methanesulfonic acid Drugs 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000003786 synthesis reaction Methods 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 7
- 239000003814 drug Substances 0.000 abstract description 3
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- JOOXCMJARBKPKM-UHFFFAOYSA-N 4-oxopentanoic acid Chemical compound CC(=O)CCC(O)=O JOOXCMJARBKPKM-UHFFFAOYSA-N 0.000 description 172
- 229940040102 levulinic acid Drugs 0.000 description 86
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 78
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 51
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 48
- 239000007787 solid Substances 0.000 description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 42
- 239000002904 solvent Substances 0.000 description 42
- 238000003756 stirring Methods 0.000 description 37
- 238000004128 high performance liquid chromatography Methods 0.000 description 35
- 239000000203 mixture Substances 0.000 description 34
- 238000005406 washing Methods 0.000 description 31
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 30
- 239000012065 filter cake Substances 0.000 description 28
- 238000005481 NMR spectroscopy Methods 0.000 description 25
- 238000001228 spectrum Methods 0.000 description 25
- 238000004821 distillation Methods 0.000 description 24
- 238000010992 reflux Methods 0.000 description 23
- 238000001308 synthesis method Methods 0.000 description 23
- 238000000746 purification Methods 0.000 description 22
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 21
- 238000001914 filtration Methods 0.000 description 21
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 238000004090 dissolution Methods 0.000 description 18
- 239000000047 product Substances 0.000 description 16
- 239000000706 filtrate Substances 0.000 description 15
- QYAGXTGWWDCSHJ-UHFFFAOYSA-N 2-[(2,5-dimethoxyoxolan-2-yl)methyl]isoindole-1,3-dione Chemical compound O1C(OC)CCC1(OC)CN1C(=O)C2=CC=CC=C2C1=O QYAGXTGWWDCSHJ-UHFFFAOYSA-N 0.000 description 14
- 229910017053 inorganic salt Inorganic materials 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 12
- 230000003647 oxidation Effects 0.000 description 12
- 239000003054 catalyst Substances 0.000 description 11
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 10
- 230000006837 decompression Effects 0.000 description 10
- 239000007868 Raney catalyst Substances 0.000 description 9
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 9
- 229910000564 Raney nickel Inorganic materials 0.000 description 9
- 238000001953 recrystallisation Methods 0.000 description 9
- 238000001291 vacuum drying Methods 0.000 description 9
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 8
- -1 potassium monopersulfate compound salt Chemical class 0.000 description 8
- GZYGYLSHLHOMAO-UHFFFAOYSA-N 2,5-dimethoxy-2-methyloxolane Chemical compound COC1CCC(C)(OC)O1 GZYGYLSHLHOMAO-UHFFFAOYSA-N 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 7
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 7
- 239000000376 reactant Substances 0.000 description 7
- 229910052707 ruthenium Inorganic materials 0.000 description 7
- 238000005160 1H NMR spectroscopy Methods 0.000 description 6
- VQKFNUFAXTZWDK-UHFFFAOYSA-N 2-Methylfuran Chemical compound CC1=CC=CO1 VQKFNUFAXTZWDK-UHFFFAOYSA-N 0.000 description 6
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- JKTCBAGSMQIFNL-UHFFFAOYSA-N 2,3-dihydrofuran Chemical compound C1CC=CO1 JKTCBAGSMQIFNL-UHFFFAOYSA-N 0.000 description 5
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 5
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 5
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- GAEKPEKOJKCEMS-UHFFFAOYSA-N gamma-valerolactone Chemical compound CC1CCC(=O)O1 GAEKPEKOJKCEMS-UHFFFAOYSA-N 0.000 description 5
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 4
- 239000004480 active ingredient Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 4
- SZVDGKFPAMSDKN-UHFFFAOYSA-N furan;methanamine Chemical compound NC.C=1C=COC=1 SZVDGKFPAMSDKN-UHFFFAOYSA-N 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 238000009776 industrial production Methods 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- YNOGYQAEJGADFJ-UHFFFAOYSA-N oxolan-2-ylmethanamine Chemical compound NCC1CCCO1 YNOGYQAEJGADFJ-UHFFFAOYSA-N 0.000 description 4
- 238000007539 photo-oxidation reaction Methods 0.000 description 4
- NAYYNDKKHOIIOD-UHFFFAOYSA-N phthalamide Chemical compound NC(=O)C1=CC=CC=C1C(N)=O NAYYNDKKHOIIOD-UHFFFAOYSA-N 0.000 description 4
- 235000011056 potassium acetate Nutrition 0.000 description 4
- JQWHASGSAFIOCM-UHFFFAOYSA-M sodium periodate Chemical compound [Na+].[O-]I(=O)(=O)=O JQWHASGSAFIOCM-UHFFFAOYSA-M 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 3
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000003480 eluent Substances 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- DDRPCXLAQZKBJP-UHFFFAOYSA-N furfurylamine Chemical compound NCC1=CC=CO1 DDRPCXLAQZKBJP-UHFFFAOYSA-N 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- KNTLTMLEQPLVDA-UHFFFAOYSA-N 2-methyl-3-oxobutanal Chemical compound O=CC(C)C(C)=O KNTLTMLEQPLVDA-UHFFFAOYSA-N 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- ZLHFONARZHCSET-UHFFFAOYSA-N 5-aminolevulinic acid hydrochloride Chemical compound Cl.NCC(=O)CCC(O)=O ZLHFONARZHCSET-UHFFFAOYSA-N 0.000 description 2
- WDJHALXBUFZDSR-UHFFFAOYSA-N Acetoacetic acid Natural products CC(=O)CC(O)=O WDJHALXBUFZDSR-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 208000009621 actinic keratosis Diseases 0.000 description 2
- YKIOKAURTKXMSB-UHFFFAOYSA-N adams's catalyst Chemical compound O=[Pt]=O YKIOKAURTKXMSB-UHFFFAOYSA-N 0.000 description 2
- 229960002749 aminolevulinic acid Drugs 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229940117975 chromium trioxide Drugs 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010511 deprotection reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- WOWBFOBYOAGEEA-UHFFFAOYSA-N diafenthiuron Chemical compound CC(C)C1=C(NC(=S)NC(C)(C)C)C(C(C)C)=CC(OC=2C=CC=CC=2)=C1 WOWBFOBYOAGEEA-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 125000006239 protecting group Chemical group 0.000 description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 238000007142 ring opening reaction Methods 0.000 description 2
- BIXNGBXQRRXPLM-UHFFFAOYSA-K ruthenium(3+);trichloride;hydrate Chemical compound O.Cl[Ru](Cl)Cl BIXNGBXQRRXPLM-UHFFFAOYSA-K 0.000 description 2
- 238000010898 silica gel chromatography Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- IXXIIAPIURLROR-UHFFFAOYSA-N 2-aminopentanoic acid;hydrochloride Chemical compound Cl.CCCC(N)C(O)=O IXXIIAPIURLROR-UHFFFAOYSA-N 0.000 description 1
- JTNCEQNHURODLX-UHFFFAOYSA-N 2-phenylethanimidamide Chemical compound NC(=N)CC1=CC=CC=C1 JTNCEQNHURODLX-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 241000345998 Calamus manan Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 125000004852 dihydrofuranyl group Chemical group O1C(CC=C1)* 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- MHYCRLGKOZWVEF-UHFFFAOYSA-N ethyl acetate;hydrate Chemical compound O.CCOC(C)=O MHYCRLGKOZWVEF-UHFFFAOYSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 150000002500 ions Chemical class 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
- 244000005700 microbiome Species 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000006012 monoammonium phosphate Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- YTJSFYQNRXLOIC-UHFFFAOYSA-N octadecylsilane Chemical compound CCCCCCCCCCCCCCCCCC[SiH3] YTJSFYQNRXLOIC-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000002428 photodynamic therapy Methods 0.000 description 1
- 229910000343 potassium bisulfate Inorganic materials 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000012950 rattan cane Nutrition 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229930187593 rose bengal Natural products 0.000 description 1
- AZJPTIGZZTZIDR-UHFFFAOYSA-L rose bengal Chemical compound [K+].[K+].[O-]C(=O)C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1C1=C2C=C(I)C(=O)C(I)=C2OC2=C(I)C([O-])=C(I)C=C21 AZJPTIGZZTZIDR-UHFFFAOYSA-L 0.000 description 1
- 229940081623 rose bengal Drugs 0.000 description 1
- STRXNPAVPKGJQR-UHFFFAOYSA-N rose bengal A Natural products O1C(=O)C(C(=CC=C2Cl)Cl)=C2C21C1=CC(I)=C(O)C(I)=C1OC1=C(I)C(O)=C(I)C=C21 STRXNPAVPKGJQR-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- HRQDCDQDOPSGBR-UHFFFAOYSA-M sodium;octane-1-sulfonate Chemical compound [Na+].CCCCCCCCS([O-])(=O)=O HRQDCDQDOPSGBR-UHFFFAOYSA-M 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229940126585 therapeutic drug Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
- C07D209/44—Iso-indoles; Hydrogenated iso-indoles
- C07D209/48—Iso-indoles; Hydrogenated iso-indoles with oxygen atoms in positions 1 and 3, e.g. phthalimide
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- 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
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Abstract
The invention relates to a preparation method of a 5-aminolevulinic acid hydrochloride intermediate, which belongs to the field of medical compound synthesis and comprises the following technical points: a preparation method of a 5-aminolevulinic acid hydrochloride intermediate comprises the following steps: in the method a, the compound of the formula (2) is hydrogenated under the action of a reaction solvent a and an oxidant a to obtain the compound of the formula (5) and the compound of the formula (6). The invention adopts the environment-friendly oxidizing reagent, can reduce the cost and simultaneously meet the quality requirement of high-quality medicine raw materials, can improve the production efficiency, and meets the requirement of industrialized mass production.
Description
The invention relates to a divisional application, the basis of which is an invention application with the application number 2020105086409, the application date 2020.06.06 and the invention name of a preparation method of a 5-aminolevulinic acid hydrochloride intermediate.
Technical Field
The invention relates to the field of synthesis of medical compounds, in particular to a preparation method of a 5-aminolevulinic acid hydrochloride intermediate.
Background
Photodynamic therapy (PDT) was initiated in the seventies of the twentieth century, and has gradually become one of the basic means for treating tumors in recent years due to the development and progress of photosensitive substances and the like. The 5-aminolevulinic acid hydrochloride is hydrochloride of a new generation of photodynamic therapeutic drug 5-aminolevulinic acid (5-ALA) and is clinically used for treating actinic keratosis (Actinic Keratoses, AK).
Although the 5-aminolevulinic acid hydrochloride has a simple structure, the synthesis of the 5-aminolevulinic acid hydrochloride is quite difficult, and particularly, the process capable of carrying out industrial production is the most relevant prior art:
1. Furan methylamine is used as a raw material, phthalic diamide, photooxidation, reduction and hydrolysis (EP 607,952):
2. Furan methylamine is used as a raw material, and is subjected to reduction, phthalic diamide and ruthenium catalytic oxidation and hydrolysis (EP 483,714):
The prior art solutions described above have the following drawbacks:
The synthesis routes 1 and 2 both use furan methylamine as a starting material, the yield of the photooxidation step of the route 1 is low, the purity of the obtained intermediate is not high, and the industrialization prospect is uncertain; the synthesis route 2 uses the expensive ruthenium catalyst, the key step has low oxidation reaction yield and poor product quality, and particularly the intermediate is subjected to 2 times of silica gel column purification, so that the cost is high, and obviously the method is not the best industrial scheme. At present, no mature industrial report and large-scale industrial production are known in the two routes.
Disclosure of Invention
Aiming at the defects existing in the prior art, one of the purposes of the invention is to provide a preparation method of a 5-aminolevulinic acid hydrochloride intermediate, which is obtained through steps such as oxidation and the like; the oxidation ring-opening step adopts environment-friendly potassium monopersulfate composite salt (Oxone), sodium persulfate, potassium persulfate or hydrogen peroxide as an oxidizing reagent, so that the use of an expensive ruthenium catalyst is avoided. The method not only can remarkably reduce the cost, but also can improve the production efficiency, has mild reaction conditions, is particularly environment-friendly, and meets the requirement of industrial mass production.
The first object of the present invention is achieved by the following technical solutions:
a process for the preparation of a 5-aminolevulinic acid hydrochloride intermediate, said 5-aminolevulinic acid hydrochloride intermediate being a compound of formula (6), comprising the steps of:
carrying out oxidation reaction on the compound of the formula (1) or the formula (2) in a reaction solvent a at the temperature of 2-70 ℃ under the action of an oxidant a to obtain a compound of the formula (5), and then carrying out hydrogenation reduction to obtain a compound of the formula (6);
the chemical reaction equation is as follows:
wherein R 1,R2 is C1-C2 alkyl, R is hydrogen or C1-C4 alkyl;
the oxidant a is formed by mixing one or more than two compounds selected from sodium persulfate, potassium persulfate, hydrogen peroxide water solution, potassium monopersulfate composite salt and sodium monopersulfate composite salt;
The reaction solvent a is a mixed solution composed of an organic solvent a and water; the water content in the reaction solvent a is 10-99w/w%; the organic solvent a is formed by mixing one or more than two compounds of acetone, butanone and dioxane.
By adopting the technical scheme, the compound of the formula (1) or the formula (2) respectively uses the oxidizing agents a of sodium persulfate, potassium persulfate, hydrogen peroxide water solution, potassium monopersulfate composite salt and sodium monopersulfate composite salt to carry out oxidation reaction to obtain a 5-aminolevulinate intermediate; the oxidation step adopts an environment-friendly oxidant a, so that the use of an expensive ruthenium catalyst can be effectively avoided; the preparation method has the advantages of simple process, mild reaction, easy operation and high yield, and is suitable for large-scale industrial mass production.
The oxidation process described above requires the presence of water, which, in combination with the principle of action of the oxidizing agent (potassium monopersulfate complex), is known to assist the potassium monopersulfate complex in releasing active oxygen [ O ], to oxidize the compound of formula (1) or (2) to produce the 5-aminolevulinate intermediate.
The present invention may be further configured in a preferred example to: the reaction temperature of the oxidation step is 20-50 ℃.
The present invention may be further configured in a preferred example to: the oxidizing agent a is preferably a potassium monopersulfate complex salt.
By adopting the technical scheme, the potassium monopersulfate compound salt (namely Oxone) has the oxidation active ingredient of potassium monopersulfate. Potassium monopersulfate is an inorganic peroxide which combines with potassium bisulfate and potassium sulfate to form a triple salt, and is therefore called a potassium monopersulfate complex salt, which has a molecular formula of 2KHSO 5·KHSO4K2SO4 and a molecular weight of 614.7. In addition, the potassium monopersulfate composite salt is a free-flowing white powdery solid, is easy to dissolve in water, is relatively stable in a normal solid state, is slowly decomposed, and does not generate harmful substances. In addition, after the potassium monopersulfate composite salt is dissolved in water, the active ingredient potassium monopersulfate can release active oxygen [ O ], and generates sulfuric acid free radical, oxygen free radical, hydroxyl free radical (OH) and other various ingredients through catalytic chain reaction, so that the potassium monopersulfate composite salt not only can efficiently catalyze and oxidize the compound of formula (1) or formula (2), but also has the effects of widely killing microorganisms, decomposing organic pollutants and the like, and is environment-friendly.
The second object of the present invention is achieved by the following technical solutions:
a process for the preparation of a 5-aminolevulinic acid hydrochloride intermediate, said 5-aminolevulinic acid hydrochloride intermediate being a compound of formula (6), comprising the steps of:
Carrying out oxidation reaction on the compound of the formula (3) or the formula (4) in a reaction solvent a at the temperature of 2-70 ℃ under the action of an oxidant a to obtain a compound of the formula (6);
the chemical reaction equation is as follows:
wherein R 1,R2 is C1-C2 alkyl, R is hydrogen or C1-C4 alkyl;
the oxidant a is formed by mixing one or more than two compounds selected from sodium persulfate, potassium persulfate, hydrogen peroxide water solution, potassium monopersulfate composite salt and sodium monopersulfate composite salt;
The reaction solvent a is a mixed solution composed of an organic solvent a and water; the water content in the reaction solvent a is 10-99w/w%; the organic solvent a is formed by mixing one or more than two compounds of acetone, butanone and dioxane.
By adopting the technical scheme, the compound of the formula (3) or the compound of the formula (3) can also be subjected to oxidation reaction by using the same oxidant a to obtain the 5-aminolevulinic acid hydrochloride intermediate. The oxidation step adopts an environment-friendly oxidant a, so that the use of an expensive ruthenium catalyst can be effectively avoided; the preparation method has the advantages of simple process, mild reaction, easy operation and high yield, and is suitable for large-scale industrial mass production.
The present invention may be further configured in a preferred example to: the reaction solvent a is an aqueous acetone solution, and the acetone content in the aqueous acetone solution is 1-90w/w%; the reaction solvent a/the compound of formula (1) or formula (2) or formula (3) or formula (4) ranges from: 1.00-20 g of reaction solvent a is selected for each gram of the compound of formula (1) or formula (2) or formula (3) or formula (4).
The present invention may be further configured in a preferred example to: the acetone content in the acetone aqueous solution is 5-50% (w/w).
The present invention may be further configured in a preferred example to: the reaction solvent a/the compound of formula (1) or formula (2) or formula (3) or formula (4) preferably ranges from: 2.00-10 g of reaction solvent a are selected for each gram of the compound of formula (1) or formula (2) or formula (3) or formula (4).
By adopting the technical scheme, the acetone aqueous solution has better solubility for the oxidant, the reactant and the 5-aminolevulinic acid hydrochloride intermediate, so that the whole oxidation reaction can be carried out in a forward direction, and the reaction yield is better.
When the mass ratio of the reaction solvent to the reactant is determined to be 1 (1-20) through the test, the reaction yield is higher, and when the mass ratio of the optimized equal reaction solvent to the reactant is determined to be 1 (2-10) through the test, the reaction yield is higher.
The present invention may be further configured in a preferred example to: the range of the compound of the oxidant a/formula (1) or formula (2) or formula (3) or formula (4) is: 0.50 to 5.00 mol of oxidizing agent a are selected per mol of the compound of formula (1) or formula (2) or formula (3) or formula (4).
The present invention may be further configured in a preferred example to: when the oxidant a is selected from potassium monopersulfate composite salt, sodium persulfate or potassium persulfate, the range of the compound of the oxidant a/the formula (1) or the formula (2) or the formula (3) or the formula (4) is as follows: 0.50 to 2.00 mol of oxidizing agent a are selected per mol of the compound of formula (1) or formula (2) or formula (3) or formula (4).
The present invention may be further configured in a preferred example to: the oxidant a is selected from potassium monopersulfate composite salt, sodium persulfate or potassium persulfate; the range of the compound of the oxidant a/formula (1) or formula (2) or formula (3) or formula (4) is: 0.55 to 1.60 mol of oxidizing agent a are selected per mol of compound of formula (1) or formula (2) or formula (3) or formula (4).
By adopting the technical scheme, when the mole ratio of the active ingredient potassium monopersulfate KHSO 5 of the oxidant a to the reactant is determined to be 1 (1-2) through experiments, the reaction yield is higher; the reaction yield is higher when the molar ratio of the active ingredient potassium monopersulfate KHSO 5 of the oxidant a to the reactant is experimentally determined to be 1 (1.1-1.6).
The present invention may be further configured in a preferred example to: when the oxidant a is an aqueous solution of hydrogen peroxide, the range of the compound of the oxidant a/formula (1) or formula (2) or formula (3) or formula (4) is: 2.00 to 5.00 mol of the oxidizing agent a are selected per mol of the compound of the formula (1) or the formula (2) or the formula (3) or the formula (4).
The present invention may be further configured in a preferred example to: when the oxidant a is an aqueous solution of hydrogen peroxide, the range of the compound of the oxidant a/formula (1) or formula (2) or formula (3) or formula (4) is: 2.00 to 4.00 mol of the oxidizing agent a are selected per mol of the compound of the formula (1) or the formula (2) or the formula (3) or the formula (4).
By adopting the technical scheme, when the mole ratio of the oxidant a (namely the aqueous solution of hydrogen peroxide) to the reactant is determined to be 1 (2-5) through experiments, the reaction yield is higher; the reaction yield was higher when the molar ratio of the oxidizing agent a (i.e., aqueous hydrogen peroxide) to the reactants was experimentally determined to be 1 (2-4).
The present invention may be further configured in a preferred example to: the preparation steps of the compound of the formula (2) are as follows:
acidic hydrolysis of the compound of formula (1) under the action of an acid catalyst i and an organic solvent a to obtain a compound of formula (2);
the chemical reaction equation is as follows:
wherein R 1,R2 is C1-C2 alkyl;
The acid catalyst i is selected from sulfuric acid or methanesulfonic acid.
By adopting the technical scheme, the compound of the formula (1) is subjected to acidic hydrolysis and ring opening under the action of the acid catalyst i and the organic solvent a to obtain the compound of the formula (2), and an operator can prepare the compound of the formula (1) to obtain the compound of the formula (2) according to the requirement, so that the obtaining mode of the compound of the formula (2) is increased.
The present invention may be further configured in a preferred example to: the preparation steps of the compound of the formula (3) are as follows:
the compound of the formula (1) is subjected to hydrogenation reaction in a reaction solvent d under the action of a reducing agent d to obtain a compound of the formula (3); the chemical reaction equation is as follows:
wherein R 1,R2 is C1-C2 alkyl, R is hydrogen or C1-C4 alkyl;
The reaction solvent d is one or more than two of methanol, ethanol, n-propanol and isopropanol;
the reducing agent d is selected from Ni/H 2.
By adopting the technical scheme, the compound of the formula (1) is subjected to hydrogenation reduction in the reaction solvent d under the action of the reducing agent d to obtain the compound of the formula (3), and an operator can prepare the compound of the formula (1) to obtain the compound of the formula (3) according to the requirement, so that the obtaining mode of the compound of the formula (3) is increased.
The present invention may be further configured in a preferred example to: the preparation steps of the compound of the formula (4) are as follows:
Acidic hydrolysis of the compound of formula (3) under the action of an acid catalyst ii and an organic solvent a to obtain a compound of formula (4);
the chemical reaction equation is as follows:
wherein R 1,R2 is C1-C2 alkyl;
The acid catalyst ii is selected from sulfuric acid or methanesulfonic acid.
By adopting the technical scheme, the compound of the formula (3) is hydrolyzed and ring-opened in the presence of the acid catalyst ii under the action of the organic solvent a to obtain the compound of the formula (4), and an operator can prepare the compound of the formula (1) to obtain the compound of the formula (3) according to the requirement, so that the obtaining mode of the compound of the formula (4) is increased.
The present invention may be further configured in a preferred example to: the purification method of the compound of the formula (6) is a solvent recrystallization method, and the purification solvent is a mixed solution consisting of an organic solvent c and water; the organic solvent c is formed by mixing one or more of butyl acetate, ethyl acetate and methyl acetate; the water content of the purified solvent is 5-90w/w%.
In the recrystallization step, the purification solvent/compound of formula (6) ranges from: 1.00-50 g of purification solvent is selected per gram of compound of formula (6).
Through adopting above-mentioned technical scheme, butyl acetate, ethyl acetate, methyl acetate's aqueous solution is common purification solvent that recrystallization was used, and the heating has higher dissolution product's effect, can also make the product precipitate again in solution after the cooling simultaneously, through above-mentioned dissolving and the process that solid precipitated again, can make the impurity that is originally covered by the solid better dispersion, sets up to dissolve in above-mentioned purification solution to reach the effect of faster purification product.
The presence of water increases the conditions for precipitation of solids, the organic substances are generally insoluble in water, but readily soluble in organic solvents such as butyl acetate, ethyl acetate, methyl acetate and the like, and by controlling the proportions of butyl acetate, ethyl acetate, methyl acetate and water and by detecting the melting point of the product, the solubility of the product in the purified solvent can be increased by increasing the temperature (boiling the solution), and the solubility of the product in the purified solvent can be reduced by cooling to a reduced temperature (immersing in cooling water), thereby improving the purity of the product for the purpose of recrystallization.
The present invention may be further configured in a preferred example to: the purification solvent/compound of formula (6) preferably ranges from: 3.00-10 g of purification solvent per g of compound of (6).
By adopting the technical scheme, the consumption of the purifying solvent needs to be changed according to the change of the mass of the compound in the formula (6), and the recrystallization efficiency can be effectively improved by optimizing the consumption of the purifying solvent, so that the purity of the product is effectively improved.
The present invention may be further configured in a preferred example to: the purifying solvent is ethyl acetate aqueous solution, and the content of the ethyl acetate in the ethyl acetate aqueous solution is 95-10w/w percent.
The present invention may be further configured in a preferred example to: the purifying solvent is ethyl acetate aqueous solution, and the content of the ethyl acetate in the ethyl acetate aqueous solution is 40-80w/w percent.
By adopting the technical scheme, the ethyl acetate is colorless transparent organic liquid, the molecular formula of the ethyl acetate is C 4H8O2, the ethyl acetate can be mixed with chloroform, ethanol, acetone and diethyl ether, and the ethyl acetate is dissolved in water (10% ml/ml) and has a boiling point of 77 ℃. Whereas the boiling point of acetone is 56.53 c and the boiling point of water is 100 c. The ethyl acetate aqueous solution is used as a purifying solvent, and is mixed with acetone and water, so that the aim of better recrystallization can be effectively achieved by controlling the dosage, and the purity of the product is improved.
The third object of the present invention is achieved by the following technical solutions:
The 5-aminolevulinic acid hydrochloride intermediate prepared by the invention is applied to synthesis of 5-aminolevulinic acid hydrochloride.
The specific synthesis method comprises the following steps: the compound of formula (6) is purified and then subjected to acidic hydrolysis to remove the protecting group, or directly subjected to acidic hydrolysis to remove the protecting group, so as to obtain 5-aminolevulinic acid hydrochloride.
By adopting the technical scheme, the compound of the formula (6) is subjected to acidic hydrolysis deprotection after purification, or the product 5-aminolevulinic acid hydrochloride is obtained by directly acidic hydrolysis deprotection, and the key difference between the synthesis method of the application and the synthesis method mentioned in the background art is that: the 5-aminolevulinic acid hydrochloride intermediate prepared by the application is solid and is easy to crystallize and purify, so that the synthesized product 5-aminolevulinic acid hydrochloride has higher quality and higher yield and purity; meanwhile, the method is environment-friendly and is beneficial to industrial production.
In summary, the invention has the following beneficial effects:
1. the oxidizing agent adopted in the oxidation reaction is sodium persulfate, potassium monopersulfate composite salt, sodium monopersulfate composite salt or hydrogen peroxide water solution, so that the use of an expensive ruthenium catalyst is avoided, the reaction condition is mild, the environment is friendly, the yield is high, the raw materials are simple and easy to obtain, and the industrial production is facilitated.
2. The intermediate products of the invention are basically solid compounds, and are easy to crystallize and purify; therefore, the synthesized product 5-aminolevulinic acid hydrochloride has higher quality, is simple and convenient to operate, has higher yield and purity, and has decisive effect on preparing pharmaceutical grade high-quality 5-aminolevulinic acid hydrochloride.
3. The invention can not only lead the quality of the finally obtained 5-aminolevulinic acid hydrochloride to be far higher than the standard requirement of United states pharmacopoeia and the purity to be more than 99.99 percent, but also greatly meet the pursuit of high-quality 5-aminolevulinic acid hydrochloride bulk drug, obviously reduce the cost, improve the production efficiency and meet the requirement of industrialized mass production.
4. In the research, the aqueous solution of the fatty acid ester has very efficient purification effect on the compound of the formula (6), the purity of the compound can be improved to more than 99 percent from 82 percent, and the requirement of producing high-quality medical grade 5-aminolevulinic acid hydrochloride is greatly met.
5. The purifying method of the compound of the formula (6) is a solvent recrystallization method, the purifying solvent is a mixed solution consisting of butyl acetate, ethyl acetate and methyl acetate and water, and the purifying solvent has the characteristics of simplicity and high efficiency.
Detailed Description
The present invention will be described in further detail with reference to examples.
1. Test conditions
Experimental materials
Furfuryl amine (Yuexing chemical industry Co., ltd.) potassium monopersulfate complex salt (Oxone, liyun Kong Xinjiang environmental protection materials Co., ltd.), 30% hydrogen peroxide (national medicine group chemical reagent Co., ltd.), absolute ethyl alcohol (TaicangXintai alcohol Co., ltd.), phthalic anhydride (Korea Aijing AEKYUNG PETROCHEMICAL CO., LTD.); potassium acetate, sodium persulfate, and potassium persulfate (national pharmaceutical systems chemical agent limited); methanol (national chemical reagent Co., ltd.), bromine (Jiangsu Ward chemical Co., ltd.), concentrated sulfuric acid (Shanghai Beijing rattan chemical Co., ltd.), concentrated hydrochloric acid (national chemical reagent Co., ltd.), acetone (China petrochemical high-bridge division Co., ltd.), ethyl acetate (Shanghai Wu Jing chemical Co., ltd.), raney nickel (Xinyi gold general chemical Co., ltd.), platinum dioxide (Nanjing chemical Co., ltd.).
(II) laboratory apparatus
(III) chromatographic detection method
Liquid chromatographic column: octadecylsilane chemically bonded silica is used as a filler.
Mobile phase: acetonitrile-ion pair buffer = 18:82 (5-aminolevulinic acid hydrochloride) or 28:72 (5-phthalimide levulinic acid).
Ion pair buffer: 1.15g of monoammonium phosphate, 2.16g of sodium octane sulfonate and 800mL of water are taken for dissolution, the pH value is regulated to 2.0 by phosphoric acid, and the mixture is diluted to 1000mL by adding water.
Detection wavelength: 205nm (5-aminolevulinic acid hydrochloride) or 220nm (5-phthalimide levulinic acid).
Sample concentration: mobile phase was dissolved, diluted to 0.5mg/1ml (5-aminolevulinate hydrochloride) or 1.0mg/1ml (5-phthalimide levulinic acid) sample size: 20 μl.
(IV) preparation of raw materials
1. Preparation of N-phthalimidomethyl furan
500G of furfuryl amine (5.15 mol) is added into a three-neck flask, 763g of phthalic anhydride (5.15 mol) is slowly added under stirring, the temperature is raised, the distillation and the dehydration are carried out for 3 hours, the reaction liquid is cooled to obtain a light brown yellow crystalline solid, a proper amount of methanol is used for recrystallization, filtration and drying are carried out, 1146g of N-phthalimidomethyl furan is obtained, and the m.p.120 ℃ is reached, and the yield is 98%.
2. Preparation of cis, trans-2-phthalimidomethyl-2, 5-dialkoxy dihydrofurans
113.6G (0.50 mol) of N-phthalimidomethyl furan, 100g of potassium acetate and 3000mL of methanol are sequentially added into a three-necked flask, and after stirring and dissolution, 25mL of liquid bromine (0.50 mol) is slowly added dropwise; stirring for 1 hour, heating, distilling, recovering methanol, cooling, crystallizing, filtering, washing the obtained solid with water, and vacuum drying to obtain 130.2g of cis, trans-2-phthalimidomethyl-2, 5-dialkoxy dihydrofuran, wherein the yield is 90%.
3. Preparation of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran
113.6G (0.50 mol) of N-phthalimidomethyl furan, 100g of potassium acetate and 3000mL of methanol are sequentially added into a three-necked flask, and after stirring and dissolution, 25mL of liquid bromine (0.50 mol) is slowly added dropwise; stirring for 2 hours, heating and distilling to about 1400ml of reaction solution, and filtering to remove inorganic salt; adding catalyst into the filtrate to obtain Raney nickel, introducing hydrogen to react until the hydrogen absorption is finished, reacting for 2 hours, filtering out Raney nickel, heating and distilling to recover methanol, adding water for cooling crystallization, washing the filtered solid with water, and vacuum drying to obtain 137.6g of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran, wherein the yield is 95%.
2. Examples and comparative examples
Example 1
A method for preparing a 5-aminolevulinic acid hydrochloride intermediate, which comprises the following operation steps:
99.0g (0.34 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran is put into a reaction flask, 700ml of acetone is added, and 140ml of water is added after stirring and dissolution; after adding 4g of 36% sulfuric acid, 209g (0.34 mol) of potassium monopersulfate complex salt (Oxone) was slowly added and stirred at 20℃for 3 hours; after the reaction is finished, inorganic salt is filtered, acetone is used for washing a filter cake, the washing solution and the filtrate are combined, the decompression concentration is carried out to remove the solvent, 400ml of water is added, the mixture is stirred for half an hour and then is filtered, and the filter cake is dried in vacuum after being washed with water, so that 87.0g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.5%, and the yield is 98.0% (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
The nuclear magnetic resonance hydrogen spectrum data are as follows: ' H NMR (. Delta.ppm. I.n CDCl 3, 400 MHz): 2.61 (2H, t), 2.84 (2H, t), 4.57 (2H, s), 7.57-7.95 (Ar 4H, m).
Application of example 1
Application example 1: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
10g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 200ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 6.1g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
The nuclear magnetic resonance hydrogen spectrum data are as follows ：1HNMR(300MHz,D2O)：δ2.59(t,J＝5.9Hz,2H,CH2),2.77(t,J＝6.0Hz,2H,CH2),4.04(s,2H,CH2).
Comparative example 1
A method for preparing a 5-aminolevulinic acid hydrochloride intermediate, which comprises the following operation steps:
46.7g (0.15 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran is added into a three-neck flask, 600ml of acetone is added for dissolution, a mixed solution of 118g of chromium trioxide/88 ml of concentrated sulfuric acid/588 ml of water is slowly added dropwise after cooling to 0 ℃, stirring is continued for 2 hours after dropwise adding, acetone is removed after the reaction is finished by reduced pressure distillation, filtering is carried out, and a filter cake is dried after washing with water, thus 25.1g of 5-phthalimidoetropionic acid is obtained, and the yield is 60% (calculated by N-phthalimidomethyl furan).
Use of comparative example 1
Application example 1-1: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
20g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 400ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 9.3g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 75 percent (calculated by 5-phthalimide levulinic acid); mp:148 ℃.
The nuclear magnetic resonance hydrogen spectrum data are as follows ：1HNMR(300MHz,D2O)：δ2.59(t,J＝5.9Hz,2H,CH2),2.77(t,J＝6.0Hz,2H,CH2),4.04(s,2H,CH2).
Example 2
A method for preparing a 5-aminolevulinic acid hydrochloride intermediate, which comprises the following operation steps:
130.2g (0.25 mol) of cis, trans-2-phthalimidomethyl-2, 5-dialkoxy dihydrofuran is taken, catalyst amount of Raney nickel is added, the reaction is carried out until the end of hydrogen absorption, the reaction is carried out for 2 hours, the Raney nickel is filtered, then the heating distillation is carried out to recover methanol, 500ml of acetone is added, and 100ml of water is added after stirring and dissolution; after adding 3g of 36% sulfuric acid, 153.7g (0.25 mol) of potassium monopersulfate complex salt (Oxone) was slowly added and stirred at 15℃for 3 hours; after the reaction, inorganic salt is filtered, the filter cake is washed by acetone, the washing solution and the filtrate are combined, the decompression concentration is carried out to remove the solvent, 300ml of water is added, the mixture is stirred for half an hour and then filtered, the filter cake is recrystallized by ethyl acetate after being washed, the mixture is dried in vacuum, the temperature of 5-phthalimide levulinic acid is 58.8g, the purity (HPLC, a/a%) is 99.99%, and the yield is 90% (calculated by N-phthalimide methyl furan).
Application of example 2
Application example 2: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
20g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 400ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 11.9g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 96 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
The nuclear magnetic resonance hydrogen spectrum data are as follows ：1HNMR(300MHz,D2O)δ:2.59(t,J＝5.9Hz,2H,CH2),2.77(t,J＝6.0Hz,2H,CH2),4.04(s,2H,CH2).
Comparative example 2
A method for preparing a 5-aminolevulinic acid hydrochloride intermediate, which comprises the following operation steps:
56.8g (0.25 mol) of N-phthalimidomethyl furan, 50g of potassium acetate and 1500mL of methanol are sequentially added into a three-necked flask, and after stirring and dissolution, 12.5mL of liquid bromine (0.25 mol) is slowly added dropwise; stirring for 2 hours, heating and distilling to about 700ml of reaction solution, and filtering to remove inorganic salt; adding 1.5g of platinum dioxide into the filtrate, and introducing hydrogen at normal pressure under stirring until the reaction is complete; after filtering the catalyst, distilling methanol under reduced pressure at 30 ℃, adding 600ml of acetone for dissolution, cooling to 0 ℃, slowly dropwise adding a mixed solution of 118g of chromium trioxide/88 ml of concentrated sulfuric acid/588 ml of water, continuously stirring for 2 hours after dropwise adding, removing acetone by reduced pressure distillation after the reaction is finished, filtering, washing a filter cake with water, and drying to obtain 28.6g of 5-phthalimide levulinic acid with purity (HPLC, a/a%) of 90.3% and yield of 39.55% (calculated by N-phthalimide methyl furan).
Use of comparative example 2
Application examples 1-2: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
20g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 400ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 9.4g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 76 percent (calculated by 5-phthalimide levulinic acid); mp:148 ℃.
The nuclear magnetic resonance hydrogen spectrum data are as follows ：1HNMR(300MHz,D2O)：δ2.59(t,J＝5.9Hz,2H,CH2),2.77(t,J＝6.0Hz,2H,CH2),4.04(s,2H,CH2).
Example 3
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that:
Taking 65.1g (0.25 mol) of cis, trans-2-phthalimidomethyl-2, 5-dialkoxy dihydrofuran, heating and distilling to remove the solvent, adding 500ml of acetone, stirring and dissolving, and adding 100ml of water; after adding 3g of 36% sulfuric acid, 153.7g (0.25 mol) of potassium monopersulfate complex salt (Oxone) was slowly added and stirred at 25℃for 3 hours; filtering inorganic salt after the reaction is finished, washing a filter cake by acetone, combining the washing liquid with the filtrate, and concentrating under reduced pressure to remove the solvent; adding 1500mL of methanol, stirring and dissolving, adding a catalyst amount of Raney nickel, introducing hydrogen to react until the hydrogenation reaction is finished, filtering the Raney nickel, heating and distilling to remove the solvent, adding 300mL of water, stirring for half an hour, filtering, washing a filter cake with water, vacuum drying, and obtaining 60.1g of 5-phthalimide levulinic acid, wherein the purity (HPLC, a/a%) is 99.5%, and the yield is 92% (calculated by N-phthalimide methyl furan).
Application of example 3
Application example 3: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
10.0g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 200ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone to obtain solid 5.95g, mp: purity (HPLC, a/a%) 99.9% at 149 ℃. From the nuclear magnetic resonance hydrogen spectrum data, the solid was obtained and was identified as 5-aminolevulinic acid hydrochloride in 96% yield (based on 5-phthalimide levulinic acid).
Example 4
A method for preparing a 5-aminolevulinic acid hydrochloride intermediate, which comprises the following operation steps:
43.7g (0.15 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran is put into a reaction flask, 300ml of acetone is added, 30g of 36% sulfuric acid is added after stirring and dissolving, and stirring is carried out at 20 ℃ for 24 hours; after the reaction, the solvent is removed by decompression concentration, 200ml of water is added, the mixture is stirred for 2 hours and then filtered, and the filter cake is washed with water and then dried in vacuum, thus obtaining 36g of 5-phthalimide acetyl propionaldehyde with the yield of 98 percent.
12.3G (0.05 mol) of 5-phthalimide acetyl propionaldehyde is put into a reaction bottle, 90ml of acetone is added, after stirring and dissolving, 0.5g of 36% sulfuric acid is added, 30.8g (0.05 mol) of potassium monopersulfate compound salt (Oxone) is slowly put into the reaction bottle, and stirring is carried out for 3 hours at 20 ℃; filtering inorganic salt after the reaction is finished, washing a filter cake by acetone, combining the washing liquid with the filtrate, and concentrating under reduced pressure to remove the solvent; 80ml of water is added, the mixture is stirred and filtered, and the filter cake is washed with water and dried in vacuum, thus obtaining 12.4g of 5-phthalimide levulinic acid, the purity (HPLC, a/a%) is 99.5%, and the yield is 95% (calculated by 5-phthalimide levulinic acid).
Application of example 4
Application example 4: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone to obtain 1.22g of solid, mp: purity (HPLC, a/a%) 99.9% at 149 ℃. From the nuclear magnetic resonance hydrogen spectrum data, the solid was obtained and was identified as 5-aminolevulinic acid hydrochloride, and the yield was 95.1% (based on 5-phthalimide levulinic acid).
Example 5
A method for preparing a 5-aminolevulinic acid hydrochloride intermediate, which comprises the following operation steps:
43.4g (0.15 mol) of cis, trans-2-phthalimidomethyl-2, 5-dialkoxy dihydrofuran are put into a reaction flask, 300ml of acetone is added, 30g of 36% sulfuric acid is added after stirring and dissolving, and stirring is carried out for 24 hours at 20 ℃; after the reaction, the solvent is removed by decompression concentration, 200ml of water is added, the mixture is stirred for 2 hours and then filtered, and the filter cake is washed with water and then dried in vacuum, thus obtaining 35g of 5-phthalimide acetoacetal with the yield of 96%.
12.2G (0.05 mol) of 5-phthalimide acetoacetylaldehyde is put into a reaction bottle, 90ml of acetone is added, the mixture is stirred and dissolved, 0.5g of 36% sulfuric acid is added, 30.8g (0.05 mol) of potassium monopersulfate compound salt (Oxone) is slowly added, and the mixture is stirred for 3 hours at 20 ℃; filtering inorganic salt after the reaction is finished, washing a filter cake by acetone, combining the washing liquid with the filtrate, and concentrating under reduced pressure to remove the solvent; 80ml of water is added, the mixture is stirred and filtered, and the filter cake is washed with water and then dried in vacuum, thus obtaining 12.5g of 5-phthalimide acetoacetic acid with 96 percent of yield (calculated by 5-phthalimide acetoacetal).
9.7G (0.04 mol) of 5-phthalimide acetoacetal is put into a hydrogenation reaction kettle, 200mL of methanol is added, the catalyst amount of Raney nickel (about 1 g) is added after stirring and dissolution, the hydrogenation reaction is completed, the Raney nickel is filtered off, the solvent is removed by heating and distillation, 60mL of water is added, the mixture is stirred for half an hour and filtered, a filter cake is washed with water and then dried in vacuum, 10.1g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.5%, and the yield is 98% (calculated by 5-phthalimide acetoacetic acid).
Application of example 5
Application example 5: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone to obtain 1.21g of solid, mp: purity (HPLC, a/a%) 99.9% at 149 ℃. From the nuclear magnetic resonance hydrogen spectrum data, the solid was found to be 5-aminolevulinic acid hydrochloride in 94.3% yield (based on 5-phthalimide levulinic acid).
Example 6
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 4 in that: a purification step was added after example 4.
12.3G (0.05 mol) of the 5-phthalimide levulinic acid obtained in example 4 was charged into a reaction flask, 90ml of acetone was added thereto, followed by stirring and dissolution, 0.5g of 36% sulfuric acid was added thereto, and then 22.7g (0.20 mol) of 30% hydrogen peroxide was slowly added dropwise thereto, followed by stirring at 30℃for 6 hours; after the reaction, the solvent is removed by decompression concentration, 80ml of water is added, the mixture is stirred and filtered, and the filter cake is recrystallized by ethyl acetate water and then dried in vacuum, so that 12.8g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.9%, and the yield is 98% (calculated by 5-phthalimide levulinic acid).
Application of example 6
Application example 6: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone to obtain 1.23g of solid, mp: purity (HPLC, a/a%) 99.9% at 149 ℃. From the nuclear magnetic resonance hydrogen spectrum data, the solid was obtained and was identified as 5-aminolevulinic acid hydrochloride, and the yield was 96.1% (based on 5-phthalimide levulinic acid).
Example 7
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: a purification step was added after example 1.
10.0G of 5-phthalimide levulinic acid prepared in example 1 is put into a reaction bottle, 40g of ethyl acetate and 20g of water are added, the mixture is stirred, heated and refluxed until the mixture is dissolved, the temperature is slowly reduced to 10 ℃ and the mixture is stirred for 6 hours; filtration, washing with ethyl acetate and vacuum drying gave 9.8g of 5-phthalimide levulinic acid with a purity (HPLC, a/a%) of 99.99% in 98% yield.
Application of example 7
Application example 7: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
5g of purified 5-phthalimide levulinic acid is heated and dissolved by 50ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the residue is recrystallized by acetone, thus obtaining 3.07g of 5-aminolevulinic acid hydrochloride, mp: purity (HPLC, a/a%) 99.98% yield 96% (based on 5-phthalimide levulinic acid).
Example 8
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from comparative example 1 in that: a purification step was added after comparative example 1.
10G (purity: 93.2%) of 5-phthalimide levulinic acid prepared in comparative example 1 was charged into a reaction flask, 40g of ethyl acetate and 20g of water were added, and the mixture was stirred, heated and refluxed until dissolved, slowly cooled to 10℃and stirred for 6 hours; filtration, washing with ethyl acetate and vacuum drying gave 8.85g of 5-phthalimide levulinic acid with a purity (HPLC, a/a%) of 99.95% and a yield of 95% (calculated as fold pure 5-phthalimide levulinic acid).
Example 8 application
Application example 8: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
5g of the purified 5-phthalimide levulinic acid is heated and dissolved by 50ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the residue is recrystallized by acetone to obtain 3.04g of 5-aminolevulinic acid hydrochloride, mp: purity (HPLC, a/a%) 99.96% yield 95% (based on 5-phthalimide levulinic acid).
Example 9
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from comparative example 2 in that: a purification step was added after comparative example 2.
10G (purity: 90.3%) of 5-phthalimide levulinic acid prepared in comparative example 2 was charged into a reaction flask, 40g of ethyl acetate and 20g of water were added, and the mixture was stirred, heated and refluxed until dissolved, slowly cooled to 10℃and stirred for 6 hours; filtering, washing with ethyl acetate, and vacuum drying to obtain 8.49g of 5-phthalimide levulinic acid with 94 percent of yield (calculated by the pure amount of 5-phthalimide levulinic acid).
Application of example 9
Application example 9: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
5g of the purified 5-phthalimide levulinic acid is heated and dissolved by 50ml of 6N hydrochloric acid and then is subjected to reflux reaction for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone to obtain 3.07g of 5-aminolevulinic acid hydrochloride with 96 percent of yield (calculated by the 5-phthalimide levulinic acid); mp 150 ℃.
Example 10
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 6 in that: a purification step was added after example 6.
200G of 5-phthalimide levulinic acid was prepared as in example 6, 10g (purity 82.2%) of the purified mother liquor was recovered, 40g of ethyl acetate and 20g of water were added, the mixture was stirred and refluxed until it was dissolved, the temperature was slowly lowered to 10 ℃ and stirred for 6 hours; filtering, washing with ethyl acetate, and vacuum drying to obtain 7.40g of 5-phthalimide levulinic acid with a yield of 90% (calculated by the recovered product of the mother liquor of 5-phthalimide levulinic acid).
Application of example 10
Application example 10: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
dissolving 5g of the purified 5-phthalimide levulinic acid in 50ml of 6N hydrochloric acid under heating, refluxing for 6 hours, decoloring and filtering by using active carbon, distilling under reduced pressure to remove water completely, and recrystallizing the residue by using acetone to obtain 3.04g of 5-aminolevulinic acid hydrochloride with the yield of 95% (calculated by 5-phthalimide levulinic acid); mp:149 ℃.
Example 11
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: the oxidation temperatures are different.
The specific operation comprises the following steps:
4.95g (0.017 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran was put into a reaction flask, 35ml of acetone was added thereto, and 7ml of water was added thereto after stirring and dissolution; after 0.2g of 36% sulfuric acid was added, 10.5g (0.017 mol) of potassium monopersulfate complex salt (Oxone) was slowly added thereto, and the mixture was stirred at 50℃for 3 hours; after the reaction, inorganic salt is filtered, the filter cake is washed by acetone, the washing solution and the filtrate are combined, the decompression concentration is carried out to remove the solvent, 20ml of water is added, the mixture is stirred for half an hour and then is filtered, and the filter cake is dried in vacuum after being washed by water, thus obtaining 4.33g of 5-phthalimide levulinic acid, the purity (HPLC, a/a%) is 99.5 percent, and the yield is 97.5 percent (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 11
Application example 11: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 1.23g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95.9 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
Example 12
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: the oxidation temperatures are different.
The specific operation comprises the following steps:
4.95g (0.017 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran was put into a reaction flask, 35ml of acetone was added thereto, and 7ml of water was added thereto after stirring and dissolution; after 0.2g of 36% sulfuric acid was added, 10.5g (0.017 mol) of potassium monopersulfate complex salt (Oxone) was slowly added thereto, and the mixture was stirred at 5℃until the reaction was completed; after the reaction is finished, inorganic salt is filtered, acetone is used for washing a filter cake, the washing solution and the filtrate are combined, the decompression concentration is carried out to remove the solvent, 20ml of water is added, the mixture is stirred for half an hour and then is filtered, and the filter cake is dried in vacuum after being washed with water, so that 4.30g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.5%, and the yield is 96.9% (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 12
Application example 12: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 1.22g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95.1 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
Example 13
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: the oxidation temperatures are different.
The specific operation comprises the following steps:
4.95g (0.017 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran was put into a reaction flask, 35ml of acetone was added thereto, and 7ml of water was added thereto after stirring and dissolution; after 0.2g of 36% sulfuric acid was added, 10.5g (0.017 mol) of potassium monopersulfate complex salt (Oxone) was slowly added thereto, and the mixture was stirred at 65℃until the reaction was completed; after the reaction is finished, inorganic salt is filtered, acetone is used for washing a filter cake, the washing solution and the filtrate are combined, the decompression concentration is carried out to remove the solvent, 20ml of water is added, the mixture is stirred for half an hour and then is filtered, and the filter cake is dried in vacuum after being washed with water, so that 4.34g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.5%, and the yield is 97.8% (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 13
Application example 13: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 1.23g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95.9 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
Example 14
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: the oxidant a is sodium persulfate.
4.95G (0.017 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran was put into a reaction flask, 35ml of acetone was added thereto, and 7ml of water was added thereto after stirring and dissolution; after 0.5g of 36% sulfuric acid was added, 4.76g (0.020 mol) of sodium persulfate was slowly added thereto, and stirred at 50℃until the reaction was completed; after the reaction is finished, inorganic salt is filtered, acetone is used for washing a filter cake, the washing solution and the filtrate are combined, the reduced pressure concentration is carried out to remove the solvent, 20ml of water is added, the mixture is stirred for half an hour and then is filtered, and the filter cake is dried in vacuum after being washed with water, so that 4.15g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.5%, and the yield is 93.5% (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 14
Application example 14: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 1.24g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 96.6 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
Example 15
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: both oxidant a and oxidant b are aqueous solutions of hydrogen peroxide.
4.95G (0.017 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran was put into a reaction flask, 35ml of acetone was added thereto, and 7ml of water was added thereto after stirring and dissolution; after 0.5g of 36% sulfuric acid was added, 5.78g (0.051 mol) of a 30% aqueous hydrogen peroxide solution was slowly added, and the mixture was stirred at 20℃until the reaction was completed; the solvent was removed by concentration under reduced pressure, 20ml of water was added, the mixture was stirred for half an hour, and then the mixture was filtered, and the cake was washed with water and dried under vacuum to give 4.23g of 5-phthalimidoyl levulinic acid, m.p.163 ℃, 99.5% purity (HPLC, a/a%) and 95.3% yield (based on 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 15
Application example 15: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 1.23g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95.9 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
Example 16
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: the oxidant a is a potassium monopersulfate composite salt, and the oxidant b is an aqueous solution of hydrogen peroxide.
4.95G (0.017 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran was put into a reaction flask, 35ml of acetone was added thereto, and 7ml of water was added thereto after stirring and dissolution; after 0.5g of 36% sulfuric acid was added, 3.69g (0.006 mol) of potassium monopersulfate complex salt (Oxone) was slowly added, followed by stirring at 25℃for 3 hours, 1.7g (0.015 mol) of 30% aqueous hydrogen peroxide solution was added dropwise, and stirring at 25℃until the reaction was completed; after the reaction is finished, inorganic salt is filtered, acetone is used for washing a filter cake, the washing solution and the filtrate are combined, the decompression concentration is carried out to remove the solvent, 20ml of water is added, the mixture is stirred for half an hour and then is filtered, and the filter cake is dried in vacuum after being washed with water, so that 4.24g of 5-phthalimide levulinic acid is obtained, the purity (HPLC, a/a%) is 99.5%, and the yield is 95.5% (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 16
Application example 16: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
2.00g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 40ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 1.22g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95.1 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
Example 17
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: the oxidation reaction solvents are different.
9.9G (0.034 mol) of 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran, 70ml of dioxane and 14ml of water are added after stirring and dissolution; after adding 0.4g of 36% sulfuric acid, 21g (0.034 mol) of potassium monopersulfate complex salt (Oxone) was slowly added and stirred at 20℃for 3 hours; after the reaction is finished, inorganic salt is filtered, acetone is used for washing a filter cake, washing solution and filtrate are combined, decompression concentration is carried out to remove solvent, 40ml of water is added, stirring is carried out for half an hour, filtering is carried out, and vacuum drying is carried out on the filter cake after water washing, thus obtaining 8.5g of 5-phthalimide levulinic acid, the purity (HPLC, a/a%) is 99.5%, and the yield is 96.0% (calculated by 2-phthalimide methyl-2, 5-dimethoxy tetrahydrofuran).
Application of example 17
Application example 17: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
1.0g of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 20ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 0.61g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid is determined to be 5-aminolevulinic acid hydrochloride, and the yield is 95 percent (calculated by 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 99.9% at 149 ℃.
The nuclear magnetic resonance hydrogen spectrum data are as follows ：1HNMR(300MHz,D2O)δ:2.59(t,J＝5.9Hz,2H,CH2),2.77(t,J＝6.0Hz,2H,CH2),4.04(s,2H,CH2).
Comparative example 3
A process for the preparation of 5-aminolevulinic acid hydrochloride intermediate, which differs from example 1 in that: 10g of the purified mother liquor obtained in example 9 (purity 82.2%) was recovered, 30g of acetone and 10g of water were added, and the mixture was stirred, heated and refluxed until dissolved, slowly cooled to 10℃and stirred for 6 hours; filtration, washing with acetone and vacuum drying gave 7.23g of 5-phthalimide levulinic acid with a purity (HPLC, a/a%) of 85.2% and a yield of 75% (calculated as fold pure 5-phthalimide levulinic acid).
Application of comparative example 3
Application examples 1-3: a synthesis method of 5-aminolevulinic acid hydrochloride comprises the following operation steps:
Dissolving 5g (purity 85.25%) of the purified 5-phthalimide levulinic acid in 50ml of 6N hydrochloric acid under heating, refluxing for 6 hours, decoloring and filtering by using active carbon, distilling under reduced pressure to remove water completely, and recrystallizing the residue by using acetone to obtain 2.13g of 5-aminolevulinic acid hydrochloride with a yield of 78% (calculated by 5-phthalimide levulinic acid); mp:149 ℃.
Comparative example 4
A preparation method of 5-aminolevulinic acid hydrochloride takes furanmethylamine as a raw material, and phthalic diamide, photooxidation, reduction and hydrolysis (EP 607,952) are adopted:
2.27g (0.010 mol) of N-phthalimidomethylfuran was charged into a three-necked flask equipped with an oxygen pipe, a thermometer and a reflux condenser, 100ml of anhydrous pyridine and 7mg of rose bengal were added, oxygen was introduced at a rate of 20 ml/min at 10 to 20℃for 5 hours, the reaction mixture was irradiated with a light source of 12w from the outside of the reaction flask for 7 hours, and the photooxidation reaction was completed, and pyridine was distilled off under reduced pressure to completion to obtain 2.47g of a semicrystalline product.
2.47G of the semi-crystalline product obtained above was dissolved in 50ml of methanol, and the mixture was hydrogenolyzed with 250mg of 5% palladium on charcoal, and the catalyst was filtered and the solvent was distilled off under reduced pressure to obtain 2.61g of crystals.
2.47G of the crystals obtained above were dissolved in 120ml of 6N hydrochloric acid under heating and then refluxed for 5 hours, decolorized and filtered with activated carbon, distilled under reduced pressure to remove water completely, and the residue was recrystallized from acetone to obtain 0.851g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid was obtained and was identified as 5-aminolevulinic acid hydrochloride, and the yield was 51% (as N-phthalimidomethyl furan); mp:148 ℃, purity (HPLC, a/a%) 96.9%.
The nmr hydrogen spectrum data were as follows: the nuclear magnetic resonance hydrogen spectrum data are as follows ：1HNMR(300MHz,D2O)δ:2.59(t,J＝5.9Hz,2H,CH2),2.77(t,J＝6.0Hz,2H,CH2),4.04(s,2H,CH2).
Comparative example 5
A preparation method of 5-aminolevulinic acid hydrochloride takes furan methylamine as raw material, and adopts reduction, phthalic diamide, ruthenium catalytic oxidation and hydrolysis (EP 483,714):
(1) Preparation of N-phthalimidomethyl tetrahydrofuran
19.8G (134 mmol) of phthalic anhydride are dissolved in 500mL of chloroform, 10g (99 mmol) of tetrahydrofurfuryl amine are added with stirring and the mixture is dehydrated under reflux. The reaction mixture was cooled, then poured into 300ml of saturated aqueous sodium bicarbonate solution, and the organic solvent layer was separated; the aqueous layer was extracted twice with chloroform, the extracts were combined and washed with aqueous sodium bicarbonate, then with water, and then dried over anhydrous magnesium sulfate; the solvent was distilled off from the organic solvent layer under reduced pressure, and the crude product was purified by recrystallization from a mixed solvent of hexane and methylene chloride to give 21.8g of N-phthalimidomethyl tetrahydrofuran in a yield of 95.2% (based on tetrahydrofurfurylamine).
(2) Preparation of 5-phthalimide levulinic acid
Sequentially adding 25ml of carbon tetrachloride, 25ml of acetonitrile and 30ml of water into a reaction bottle, adding 5.0g (220 mmol) of N-phthalimidomethyl tetrahydrofuran prepared in the step (1), and stirring until the mixture is dissolved; 19g (87 mmol) of sodium periodate and 0.10g (2.2 mol%) of ruthenium chloride hydrate were added and then stirred vigorously at room temperature overnight; after the completion of the reaction, insoluble matter was filtered off, the filtrate was distilled in vacuo to remove the solvent, and the residue was dissolved in a mixed solution of chloroform and 1N aqueous hydrochloric acid solution, followed by extraction with chloroform. The organic solvent layer extract was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure to obtain a residue. The residue was purified by silica gel column chromatography eluting with eluent a (chloroform: methanol=95:5 v/v) to give first 5-phthalimide-1, 4-valerolactone; then eluting with eluent B (chloroform: methanol: formic acid=95:4:1 v/v), thereby obtaining 5-phthalimide levulinic acid.
Thus, 1.5g of 5-phthalimide-1, 4-valerolactone was obtained in a yield of 28% (based on N-phthalimidomethyl tetrahydrofuran); 2.1g of 5-phthalimidoyl levulinic acid (purity 90.23%) was obtained in 37% yield (based on N-phthalimidomethyl tetrahydrofuran).
The chemical structure of 5-phthalimide-1, 4-valerolactone is as follows:
Adding 2ml of carbon tetrachloride, 10ml of acetonitrile and 3ml of water into a reaction bottle in sequence, adding 0.3g (1.2 mmol) of 5-phthalimide-1, 4-valerolactone prepared in the steps, and stirring until the mixture is dissolved; 2.5g (12 mmol) of sodium periodate and 90mg (30 mol%) of ruthenium chloride hydrate are added and then stirred vigorously at 50℃for 24 hours; after the completion of the reaction, insoluble matter was filtered off, the filtrate was distilled in vacuo to remove the solvent, and the residue was dissolved in a mixed solution of chloroform and 1N aqueous hydrochloric acid solution, followed by extraction with chloroform. The organic solvent layer extract was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure to obtain a residue. The residue was purified by silica gel column chromatography, eluting with eluent B (chloroform: methanol: formic acid=95:4:1 v/v), whereby 32mg (purity 90.20%) of 5-phthalimide levulinic acid was obtained, yield 10% (5-phthalimide-1, 4-valerolactone), m.p.160 ℃.
The total yield of 5-phthalimide levulinic acid preparation is 34.2 percent (calculated by tetrahydrofurfuryl amine)
(3) Preparation of 5-aminolevulinic acid hydrochloride
1.00G of 5-phthalimide levulinic acid obtained in the last step is heated and dissolved by 20ml of 6N hydrochloric acid, then reflux reaction is carried out for 6 hours, activated carbon is decolorized and filtered, reduced pressure distillation is carried out to remove water completely, and the remainder is recrystallized by acetone, thus obtaining 0.49g of solid. From the nuclear magnetic resonance hydrogen spectrum data, the solid was obtained and was identified as 5-aminolevulinic acid hydrochloride, and the yield was 76.4% (based on 5-phthalimide levulinic acid); mp: purity (HPLC, a/a%) 96.5% at 146 ℃.
3. Statistics and analysis of experimental data
Table 1: aminovaleric acid hydrochloride and intermediate synthesis experimental data statistics thereof
Note that: * High performance liquid chromatography peak area percent a by 2-phthalimidomethyl-2, 5-dimethoxy tetrahydrofuran, b by cis, trans-2-phthalimidomethyl-2, 5-dialkoxy dihydrofuran, c by N-phthalimidomethyl furan, d by 5-phthalimidoacetamopropionic acid, e by 5-phthalimidoacetamopropionaldehyde, f by tetrahydrofurfuryl amine.
Table 2: 5-phthalimide levulinic acid purification experimental data statistics
Note that: a b by 5-phthalimide levulinic acid based on 100% fold purity before purification of 5-phthalimide levulinic acid.
Test results: as can be seen from the experimental data in tables 1 and 2, the yields of examples 1 to 9 are each greater than those of comparative examples 1 to 3; the purity of examples 1-9 was greater than that of comparative examples 1-3.
As shown in Table 2, the purity of examples 6-9 was improved from 90.3% or more to 99.95% or more before and after the purification of 5-phthalimide levulinic acid, and the purity of 5-phthalimide levulinic acid after the purification treatment was also maintained at 99.96% or more after the synthesis of 5-aminolevulinate hydrochloride. Whereas the purity of the 5-phthalimide levulinic acid of comparative example 3 was maintained at 85.25% (less than 90%) after purification treatment; meanwhile, the purity of the synthesized 5-aminolevulinic acid hydrochloride is only 78 percent, which is obviously lower than 90 percent.
The present invention is not limited by the specific embodiments, and modifications can be made to the embodiments without creative contribution by those skilled in the art after reading the present specification, but are protected by patent laws within the scope of claims of the present invention.
Claims (6)
1. A process for the preparation of a 5-aminolevulinic acid hydrochloride intermediate, said 5-aminolevulinic acid hydrochloride intermediate being a compound of formula (6), characterized by the steps of:
Carrying out oxidation reaction on the compound of the formula (2) in a reaction solvent a at the temperature of 2-70 ℃ under the action of an oxidant a to obtain a compound of the formula (5), and then carrying out hydrogenation reduction to obtain a compound of the formula (6);
the chemical reaction equation is as follows:
wherein R 1,R2 is C1-C2 alkyl, R is hydrogen or C1-C4 alkyl;
the oxidant a is formed by mixing one or more than two compounds selected from sodium persulfate, potassium persulfate, hydrogen peroxide water solution, potassium monopersulfate composite salt and sodium monopersulfate composite salt;
The reaction solvent a is a mixed solution composed of an organic solvent a and water; the water content in the reaction solvent a is 10-99w/w%; the organic solvent a is formed by mixing one or more than two compounds of acetone, butanone and dioxane.
2. The preparation method of the 5-aminolevulinic acid hydrochloride intermediate according to claim 1, wherein the reaction solvent a is an aqueous acetone solution, and the acetone content in the aqueous acetone solution is 1-90w/w%; the reaction solvent a/the compound of formula (2) ranges from: 1.00-20 g of reaction solvent a is selected per gram of compound of formula (2).
3. The process for the preparation of a 5-aminolevulinic acid hydrochloride intermediate according to claim 1, wherein the oxidizing agent a/compound of formula (2) ranges from: 0.50 to 5.00 mol of oxidizing agent a are selected per mol of the compound of formula (2).
4. A process for the preparation of a 5-aminolevulinate intermediate according to claim 3, wherein when the oxidant a is selected from the group consisting of potassium monopersulfate complex, sodium persulfate or potassium persulfate, the range of compounds of formula (2) is: 0.50 to 2.00 mol of oxidizing agent a are selected per mol of the compound of formula (2).
5. A process for the preparation of a 5-aminolevulinic acid hydrochloride intermediate according to claim 3, wherein when the oxidizing agent a is an aqueous solution of hydrogen peroxide, the oxidizing agent a/compound of formula (2) ranges from: 2.00 to 5.00 mol of the oxidizing agent a are selected per mol of the compound of the formula (2).
6. The process for the preparation of a 5-aminolevulinic acid hydrochloride intermediate according to claim 1, wherein the compound of formula (2) is prepared by the steps of:
acidic hydrolysis of the compound of formula (1) under the action of an acid catalyst i and an organic solvent a to obtain a compound of formula (2);
the chemical reaction equation is as follows: Wherein R 1,R2 is C1-C2 alkyl; the acid catalyst i is selected from sulfuric acid or methanesulfonic acid.
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