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【结 构 式】 
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【分子编号】25674 【品名】ethyl 2,2-diethoxyacetate 【CA登记号】6065-82-3 |
【 分 子 式 】C8H16O4 【 分 子 量 】176.21264 【元素组成】C 54.53% H 9.15% O 36.32% |
合成路线1
该中间体在本合成路线中的序号：(I)The reduction of 2,2-diethoxyacetic acid ethyl ester (I) with NaBH4 in dimethoxyethane gives 2,2-diethoxyethanol (II), which is condensed with ethyl 4-chloroacetoacetate (III) by means of NaH in hot THF to yield ethyl 4-(2,2-diethoxyethoxy)acetoacetate (IV). The condensation of (IV) with 2-chlorobenzaldehyde (V) by means of piperidine in refluxing toluene affords the acrylic ester (VI), which is cyclized with methyl 3-aminocrotonate (VII) in refluxing toluene to provide the dihydropyridine (VIII). The reaction of (VIII) with hydroxylamine in refluxing methanol/water gives the hydroxyimino derivative (IX), which is finally reduced to the target compound by means of H2 over Pd/C in acetic acid or with NaBH4 and NiCl2 in methanol. Alternatively, intermediate dihydropyridine (VIII) can be obtained as follows: The reaction of acetoacetate (IV) with ammonium acetate in refluxing ethanol gives ethyl 3-amino-4-(2,2-diethoxyethoxy)crotonate (X), which is cyclized with methyl 2-(2-chlorobenzylidene)acetoacetate (XI) in refluxing toluene to yield the target intermediate the dihydropyridine (VIII).
| 【1】 Pedersen, S.B.; Preikschat, H.F.; Karup, G.L. (GEA A/S Farmaceutisk Fabrik); Process for the preparation of acetal derivs. of 1,4-dihydropyridines. WO 9925689 . |
| 【2】 Karup, G.L.; Preikschat, H.F. (GEA A/S Farmaceutisk Fabrik); Process for the preparation of 1,4-dihydropyridines and cpds. used in this process. WO 9925688 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (I) | 25674 | ethyl 2,2-diethoxyacetate | 6065-82-3 | C8H16O4 | 详情 | 详情 |
| (II) | 48253 | 2,2-diethoxy-1-ethanol | 621-63-6 | C6H14O3 | 详情 | 详情 |
| (III) | 23541 | ethyl 4-chloro-3-oxobutanoate；Ethyl 4-chloro-3-oxobutanoate；Ethyl 4-chloroacetoacetate | 638-07-3 | C6H9ClO3 | 详情 | 详情 |
| (IV) | 48254 | ethyl 4-(2,2-diethoxyethoxy)-3-oxobutanoate | C12H22O6 | 详情 | 详情 | |
| (V) | 24114 | 2-chlorobenzaldehyde | 89-98-5 | C7H5ClO | 详情 | 详情 |
| (VI) | 48255 | ethyl (Z)-3-(2-chlorophenyl)-2-[2-(2,2-dimethoxyethoxy)acetyl]-2-propenoate | C17H21ClO6 | 详情 | 详情 | |
| (VII) | 11372 | Methyl (E)-3-amino-2-butenoate; Methyl 3-aminocrotonate | C5H9NO2 | 详情 | 详情 | |
| (VIII) | 48256 | 3-ethyl 5-methyl 4-(2-chlorophenyl)-2-[(2,2-dimethoxyethoxy)methyl]-6-methyl-1,4-dihydro-3,5-pyridinedicarboxylate | C22H28ClNO7 | 详情 | 详情 | |
| (IX) | 48258 | 3-ethyl 5-methyl 4-(2-chlorophenyl)-2-[[2-(hydroxyimino)ethoxy]methyl]-6-methyl-1,4-dihydro-3,5-pyridinedicarboxylate | C20H23ClN2O6 | 详情 | 详情 | |
| (X) | 48257 | ethyl (E)-3-amino-4-(2,2-diethoxyethoxy)-2-butenoate | C12H23NO5 | 详情 | 详情 | |
| (XI) | 44034 | methyl (Z)-2-acetyl-3-(2-chlorophenyl)-2-propenoate | C12H11ClO3 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(V)2,3,5-Trichlorobenzaldehyde (I) was reduced with NaBH4 to the benzyl alcohol (II) and then converted to the corresponding bromide (III) by means of PBr3 in benzene. Displacement of bromide group of (III) with KCN gave 2,3,5-trichlorophenylacetonitrile (IV), which was condensed with ethyl diethoxyacetate (V) in the presence of NaOEt to provide keto nitrile (VI). Subsequent treatment of (VI) with ethereal diazomethane generated the enol ether (VII). This was cyclized with guanidine (VIII) in boiling EtOH to produce pyrimidine (IX). After ketal hydrolysis of (IX), the resulting aldehyde (X) was reduced with NaBH4 to alcohol (XI). Finally, treatment of (XI) with diethylaminosulfur trifluoride in cold CH2Cl2 provided the desired fluoromethyl compound.
| 【1】 Miller, A.A.; Nobbs, M.S.; Hyde, R.M.; Leach, M.J. (Glaxo Wellcome plc); Pharmacologically active CNS cpds.. AU 8945964; EP 0372934; EP 0713703; EP 0715851; EP 0727212; EP 0727213; EP 0727214; JP 1990202876; US 5587380; US 5597828; US 5635507; US 5684005 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (I) | 25670 | 2,3,5-trichlorobenzaldehyde | 56961-75-2 | C7H3Cl3O | 详情 | 详情 |
| (II) | 25671 | (2,3,5-trichlorophenyl)methanol | C7H5Cl3O | 详情 | 详情 | |
| (III) | 25672 | 1-(bromomethyl)-2,3,5-trichlorobenzene | C7H4BrCl3 | 详情 | 详情 | |
| (IV) | 25673 | 2-(2,3,5-trichlorophenyl)acetonitrile | C8H4Cl3N | 详情 | 详情 | |
| (V) | 25674 | ethyl 2,2-diethoxyacetate | 6065-82-3 | C8H16O4 | 详情 | 详情 |
| (VI) | 25675 | 4,4-diethoxy-3-oxo-2-(2,3,5-trichlorophenyl)butanenitrile | C14H14Cl3NO3 | 详情 | 详情 | |
| (VII) | 25676 | (E)-4,4-diethoxy-3-methoxy-2-(2,3,5-trichlorophenyl)-2-butenenitrile | C15H16Cl3NO3 | 详情 | 详情 | |
| (VIII) | 14790 | Guanidine | 113-00-8 | CH5N3 | 详情 | 详情 |
| (IX) | 25677 | 2-amino-6-(diethoxymethyl)-5-(2,3,5-trichlorophenyl)-4-pyrimidinylamine | C15H17Cl3N4O2 | 详情 | 详情 | |
| (X) | 25678 | 2,6-diamino-5-(2,3,5-trichlorophenyl)-4-pyrimidinecarbaldehyde | C11H7Cl3N4O | 详情 | 详情 | |
| (XI) | 25679 | [2,6-diamino-5-(2,3,5-trichlorophenyl)-4-pyrimidinyl]methanol | C11H9Cl3N4O | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(II)Condensation of 4-methylacetophenone (I) with ethyl diethoxyacetate (II) in the presence of lithium hexamethyldisilazide afforded diketoacetal (III). Formation of pyrazole (V) was accomplished by treatment of (III) with 4-methoxy-phenylhydrazine (IV). Subsequent acid hydrolysis of the diethyl acetal gave aldehyde (VI), which was condensed with carbon tetrabromide using triphenyl phosphine to furnish dibromoethylene compound (VII). Elimination of HBr in (VII) by treatment with tetrabutylammonium fluoride produced bromo-acetylene (VIII). After lithium-bromine exchange, addition of paraformaldehyde yielded the propargyl alcohol (IX). Further Mitsunobu coupling of (IX) with N,O-bis(phenoxycarbonyl)hydroxylamine (X) gave the N,O-bis-protected N-alkyl hydroxylamine (XI). This was finally converted to the title N-hydroxyurea by treatment with methanolic ammonia.
| 【1】 Wetter, S.K.; Connolly, P.J.; Beers, K.N.; et al.; N-Hydroxyurea and hydroxamic acid inhibitors of cyclooxygenase and 5-lipoxygenase. Bioorg Med Chem Lett 1999, 9, 7, 979. |
| 【2】 Chen, R.; Wachter, M.; Connolly, P. (Ortho-McNeil Pharmaceutical, Inc.); Acetylenic 1,5-diarylpyrazoles as antiinflammatory agents. US 5925769 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (I) | 12685 | 4-Chloroacetophenone; 1-(4-Chlorophenyl)-1-ethanone; p-Chloroacetophenone | 99-91-2 | C8H7ClO | 详情 | 详情 |
| (II) | 25674 | ethyl 2,2-diethoxyacetate | 6065-82-3 | C8H16O4 | 详情 | 详情 |
| (III) | 34716 | 1-(4-chlorophenyl)-4,4-diethoxy-1,3-butanedione | C14H17ClO4 | 详情 | 详情 | |
| (IV) | 12688 | 4-Hydrazinophenyl methyl ether; 1-(4-Methoxyphenyl)hydrazine | 3471-32-7 | C7H10N2O | 详情 | 详情 |
| (V) | 34717 | 4-[5-(4-chlorophenyl)-3-(diethoxymethyl)-1H-pyrazol-1-yl]phenyl methyl ether; 5-(4-chlorophenyl)-3-(diethoxymethyl)-1-(4-methoxyphenyl)-1H-pyrazole | C21H23ClN2O3 | 详情 | 详情 | |
| (VI) | 34718 | 5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazole-3-carbaldehyde | C17H13ClN2O2 | 详情 | 详情 | |
| (VII) | 34719 | 4-[5-(4-chlorophenyl)-3-(2,2-dibromovinyl)-1H-pyrazol-1-yl]phenyl methyl ether; 5-(4-chlorophenyl)-3-(2,2-dibromovinyl)-1-(4-methoxyphenyl)-1H-pyrazole | C18H13Br2ClN2O | 详情 | 详情 | |
| (VIII) | 34720 | 3-(2-bromoethynyl)-5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazole; 4-[3-(2-bromoethynyl)-5-(4-chlorophenyl)-1H-pyrazol-1-yl]phenyl methyl ether | C18H12BrClN2O | 详情 | 详情 | |
| (IX) | 34725 | 3-[5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazol-3-yl]-2-propyn-1-ol | C19H15ClN2O2 | 详情 | 详情 | |
| (X) | 19646 | 1-[([[(phenoxycarbonyl)oxy]amino]carbonyl)oxy]benzene | C14H11NO5 | 详情 | 详情 | |
| (XI) | 34726 | 5-(4-chlorophenyl)-1-(4-methoxyphenyl)-3-(3-[(phenoxycarbonyl)[(phenoxycarbonyl)oxy]amino]-1-propynyl)-1H-pyrazole | C33H24ClN3O6 | 详情 | 详情 |
合成路线4
该中间体在本合成路线中的序号：(II)Condensation of 4-chloroacetophenone (I) with ethyl diethoxyacetate (II) in the presence of lithium hexamethyldisilazide afforded diketoacetal (III). Formation of pyrazole (V) was accomplished by treatment of (III) with 4-methoxy-phenylhydrazine (IV). Subsequent acid hydrolysis of the diethyl acetal gave aldehyde (VI), which was condensed with carbon tetrabromide using triphenyl phosphine to furnish dibromoethylene compound (VII). Elimination of HBr in (VII) by treatment with tetrabutylammonium fluoride produced bromoacetylene (VIII). After lithium-bromine exchange, addition of acetaldehyde yielded the propargyl alcohol (IX). Further Mitsunobu coupling of (IX) with N,O-bis(tert-butoxycarbonyl)hydroxylamine (X) gave the N,O-bis-protected N-alkyl hydroxylamine (XI). After Boc deprotection of (XI) by means of trifluoroacetic acid, coupling with acetyl chloride provided the O-acetyl hydroxamic acid (XII). Finally, cleavage of the O-acyl group of (XII) with methanolic NaOH furnished the title compound.
| 【1】 Wetter, S.K.; Connolly, P.J.; Beers, K.N.; et al.; N-Hydroxyurea and hydroxamic acid inhibitors of cyclooxygenase and 5-lipoxygenase. Bioorg Med Chem Lett 1999, 9, 7, 979. |
| 【2】 Chen, R.; Wachter, M.; Connolly, P. (Ortho-McNeil Pharmaceutical, Inc.); Acetylenic 1,5-diarylpyrazoles as antiinflammatory agents. US 5925769 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| 11974 | Acetaldehyde | 75-07-0 | C2H4O | 详情 | 详情 | |
| 19273 | acetyl chloride | 75-36-5 | C2H3ClO | 详情 | 详情 | |
| (I) | 12685 | 4-Chloroacetophenone; 1-(4-Chlorophenyl)-1-ethanone; p-Chloroacetophenone | 99-91-2 | C8H7ClO | 详情 | 详情 |
| (II) | 25674 | ethyl 2,2-diethoxyacetate | 6065-82-3 | C8H16O4 | 详情 | 详情 |
| (III) | 34716 | 1-(4-chlorophenyl)-4,4-diethoxy-1,3-butanedione | C14H17ClO4 | 详情 | 详情 | |
| (IV) | 12688 | 4-Hydrazinophenyl methyl ether; 1-(4-Methoxyphenyl)hydrazine | 3471-32-7 | C7H10N2O | 详情 | 详情 |
| (V) | 34717 | 4-[5-(4-chlorophenyl)-3-(diethoxymethyl)-1H-pyrazol-1-yl]phenyl methyl ether; 5-(4-chlorophenyl)-3-(diethoxymethyl)-1-(4-methoxyphenyl)-1H-pyrazole | C21H23ClN2O3 | 详情 | 详情 | |
| (VI) | 34718 | 5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazole-3-carbaldehyde | C17H13ClN2O2 | 详情 | 详情 | |
| (VII) | 34719 | 4-[5-(4-chlorophenyl)-3-(2,2-dibromovinyl)-1H-pyrazol-1-yl]phenyl methyl ether; 5-(4-chlorophenyl)-3-(2,2-dibromovinyl)-1-(4-methoxyphenyl)-1H-pyrazole | C18H13Br2ClN2O | 详情 | 详情 | |
| (VIII) | 34720 | 3-(2-bromoethynyl)-5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazole; 4-[3-(2-bromoethynyl)-5-(4-chlorophenyl)-1H-pyrazol-1-yl]phenyl methyl ether | C18H12BrClN2O | 详情 | 详情 | |
| (IX) | 34721 | 4-[5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazol-3-yl]-3-butyn-2-ol | C20H17ClN2O2 | 详情 | 详情 | |
| (X) | 34722 | 2-[([[(tert-butoxycarbonyl)amino]oxy]carbonyl)oxy]-2-methylpropane | C10H19NO5 | 详情 | 详情 | |
| (XI) | 34723 | 3-(3-[(tert-butoxycarbonyl)[(tert-butoxycarbonyl)oxy]amino]-1-butynyl)-5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazole | C30H34ClN3O6 | 详情 | 详情 | |
| (XII) | 34724 | 1-((acetoxy)[3-[5-(4-chlorophenyl)-1-(4-methoxyphenyl)-1H-pyrazol-3-yl]-1-methyl-2-propynyl]amino)-1-ethanone | C24H22ClN3O4 | 详情 | 详情 |