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【结 构 式】 
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【分子编号】19152 【品名】3-methyl-2-butenal 【CA登记号】107-86-8 |
【 分 子 式 】C5H8O 【 分 子 量 】84.11792 【元素组成】C 71.39% H 9.59% O 19.02% |
合成路线1
该中间体在本合成路线中的序号：(II)The cyclization of diethyl benzyloxycarbonylaminomalonate (I) with 3-methyl-2-butenal (II) by means of sodium ethoxide in ethanol, followed by hydrogenation with H2 over Pd/C in acetic acid gives 2,2-dicarbethoxy-3,3-dimethylpyrrolidine (III), which by a decarboxylative hydrolysis with refluxing aqueous 5M HCl is converted into 3,3-dimethylproline (IV). The protection of the amino group of (IV) with tert-butyl-2,4,5-trichlorophenyl carbonate (V) in hot tert-butanol - water yields N-tert-butoxycarbonyl-3,3-dimethylproline (VI), which by reaction with NH3 by means of isobutyl chloroformate and N-methylmorpholine in THF is converted into N-tert-butoxycarbonyl-3,3-dimethylprolinamide (VII). The deprotection of (VII) with HCl in dioxane affords 3,3-dimethylprolinamide (VIII), which is finally condensed with benzyloxycarbonyl-L-pyroglutamylhistidine (IX) by means of 1-hydroxybenzotriazole (HBT) and dicyclohexylcarbodiimide (DCCD) in THF, and deprotected by hydrogenation with H2 over Pd/C in THF - water.
| 【1】 Morgan, B.A.; Shafer, D.J.; US 4060603 . |
| 【2】 Castaner, J.; Blancafort, P.; Serradell, M.N.; RX-77,368. Drugs Fut 1982, 7, 3, 167. |
| 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) | 36392 | diethyl 2-[(benzyloxy)amino]malonate | C14H19NO5 | 详情 | 详情 | |
| (II) | 19152 | 3-methyl-2-butenal | 107-86-8 | C5H8O | 详情 | 详情 |
| (III) | 36393 | diethyl 3,3-dimethyl-2,2-pyrrolidinedicarboxylate | C12H21NO4 | 详情 | 详情 | |
| (IV) | 36394 | 3,3-dimethylproline | C7H13NO2 | 详情 | 详情 | |
| (V) | 36395 | tert-butyl 2,4,5-trichlorophenyl carbonate | C11H11Cl3O3 | 详情 | 详情 | |
| (VI) | 36396 | 1-(tert-butoxycarbonyl)-3,3-dimethylproline | C12H21NO4 | 详情 | 详情 | |
| (VII) | 36397 | tert-butyl 2-(aminocarbonyl)-3,3-dimethyl-1-pyrrolidinecarboxylate | C12H22N2O3 | 详情 | 详情 | |
| (VIII) | 36398 | 3,3-dimethyl-2-pyrrolidinecarboxamide | C7H14N2O | 详情 | 详情 | |
| (IX) | 36399 | (2S)-2-[([(2S)-1-[(benzyloxy)carbonyl]-5-oxopyrrolidinyl]carbonyl)amino]-3-(1H-imidazol-5-yl)propionic acid | C19H20N4O6 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(V)Reaction of benzyloxyacetyl chloride (I) with (-)-trans-2-phenylcyclohexanol (II) afforded chiral ester (III). Subsequent removal of the benzyl group by hydrogenolysis, followed by protection with triisopropylsilyl chloride and imidazole in DMF provided silyl ether (IV). Treatment of (IV) with LDA in THF at -85 C generated the corresponding enolate, which was cyclocondensed with imine (VII), (obtained from 3-methylbutenal (V) and p-anisidine (VI)), to produce azetidinone (VIII). Then, the N-p-methoxyphenyl group was removed by treatment with cerium ammonium nitrate in cold ACN-H2O, and the resulting azetidinone (IX) was coupled with di-tert-butyl dicarbonate in the presence of DMAP and Et3N to yield (X).
| 【1】 Ojima, I.; et al.; Syntheses and structure-activity relationships of taxoids derived from 14beta-hydroxy-10-deacetylbaccatin III. J Med Chem 1997, 40, 3, 267. |
| 【2】 Takahashi, N.; et al.; Growth inhibition of gastric cancer cells by troglitazone, a ligand for peroxisome proliferator-activated receptor. Dig Dis Week (May 16 1999, Orlando) 1999, Abst 3684. |
| 【3】 Ojima, I.; Bombardelli, E. (Affymax Technologies, NV; State University of New York, Albany); Anti-tumor cpds., pharmaceutical compsns., methods for preparation thereof and for treatment. US 5705508 . |
| 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) | 10493 | 2-(Benzyloxy)acetyl chloride; Benzyloxyacetyl chloride | 19810-31-2 | C9H9ClO2 | 详情 | 详情 |
| (II) | 10492 | (1S,2R)-(+)-trans-2-Phenyl-1-cyclohexanol; (1S,2R)-2-Phenylcyclohexanol | 2362-61-0 | C12H16O | 详情 | 详情 |
| (III) | 10494 | (1S,2R)-2-phenylcyclohexyl 2-(benzyloxy)acetate | C21H24O3 | 详情 | 详情 | |
| (IV) | 19151 | (1R,2S)-2-phenylcyclohexyl 2-[(triisopropylsilyl)oxy]acetate | C23H38O3Si | 详情 | 详情 | |
| (V) | 19152 | 3-methyl-2-butenal | 107-86-8 | C5H8O | 详情 | 详情 |
| (VI) | 10478 | p-Anisidine; 4-Methoxyaniline; 4-Methoxyphenylamine | 104-94-9 | C7H9NO | 详情 | 详情 |
| (VII) | 19154 | 4-methoxy-N-[(E)-3-methyl-2-butenylidene]aniline; N-(4-methoxyphenyl)-N-[(E)-3-methyl-2-butenylidene]amine | C12H15NO | 详情 | 详情 | |
| (VIII) | 19155 | (3R,4S)-1-(4-methoxyphenyl)-4-(2-methyl-1-propenyl)-3-[(triisopropylsilyl)oxy]-2-azetidinone | C23H37NO3Si | 详情 | 详情 | |
| (IX) | 19156 | (3R,4S)-4-(2-methyl-1-propenyl)-3-[(triisopropylsilyl)oxy]-2-azetidinone | C16H31NO2Si | 详情 | 详情 | |
| (X) | 19157 | tert-butyl (2S,3R)-2-(2-methyl-1-propenyl)-4-oxo-3-[(triisopropylsilyl)oxy]-1-azetidinecarboxylate | C21H39NO4Si | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(IX)Ring opening of cyclohexene oxide (I) with phenylmagnesium bromide in the presence of CuI, followed by acetylation of the resulting alcohol (II) gave the racemic trans-2-phenylcyclohexyl acetate (III). Enzymatic resolution of (III) using porcine liver acetone powder yielded the desired (-)-alcohol (II) along with unreacted (+)-acetate (III). Condensation of the sodium alkoxide of benzyl alcohol with bromoacetic acid (IV) afforded benzyloxyacetic acid (V), which was then coupled with the chiral alcohol (-)-(II) to give ester (VI). Hydrogenolysis of the O-benzyl group of (VI), followed by silylation of the resulting hydroxyacetate ester (VII) with triisopropylsilyl chloride, furnished (VIII). Imine (XI) was prepared by condensation of 3-methyl-2-butenal (IX) with p-anisidine (X). The asymmetric cyclocondensation reaction of the lithium enolate derived from ester (VIII) with imine (XI) yielded the chiral beta-lactam (XII). Oxidative removal of the p-methoxyphenyl protecting group of (XII) and then reprotection of the lactam N atom with Boc2O furnished the intermediate N-Boc lactam (XIII).
| 【1】 Strum, M.; Tynebor, R.; Pera, P.; Bernacki, R.J.; Ojima, I.; Synthesis and SAR of advanced second generation taxoids. 221st ACS Natl Meet (April 1 2001, San Diego) 2001, Abst MEDI 132. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (rac)-(III) | 51206 | (1R,2S)-2-phenylcyclohexyl acetate | C14H18O2 | 详情 | 详情 | |
| (rac)-(II) | 51208 | (1R,2S)-2-phenylcyclohexanol | C12H16O | 详情 | 详情 | |
| (-)-(II) | 51209 | (-)-(1R,2S)-2-phenylcyclohexanol | C12H16O | 详情 | 详情 | |
| (+)-(III) | 51210 | (1S,2R)-2-phenylcyclohexyl acetate | C14H18O2 | 详情 | 详情 | |
| (I) | 17986 | 7-oxabicyclo[4.1.0]heptane; cyclohexene oxide | 286-20-4 | C6H10O | 详情 | 详情 |
| (IV) | 23660 | 2-Bromoacetic acid | 79-08-3 | C2H3BrO2 | 详情 | 详情 |
| (V) | 51207 | 2-(benzyloxy)acetic acid | C9H10O3 | 详情 | 详情 | |
| (VI) | 51211 | (1R,2S)-2-phenylcyclohexyl 2-(benzyloxy)acetate | C21H24O3 | 详情 | 详情 | |
| (VII) | 51212 | (1R,2S)-2-phenylcyclohexyl 2-hydroxyacetate | C14H18O3 | 详情 | 详情 | |
| (VIII) | 19151 | (1R,2S)-2-phenylcyclohexyl 2-[(triisopropylsilyl)oxy]acetate | C23H38O3Si | 详情 | 详情 | |
| (IX) | 19152 | 3-methyl-2-butenal | 107-86-8 | C5H8O | 详情 | 详情 |
| (X) | 10478 | p-Anisidine; 4-Methoxyaniline; 4-Methoxyphenylamine | 104-94-9 | C7H9NO | 详情 | 详情 |
| (XI) | 19154 | 4-methoxy-N-[(E)-3-methyl-2-butenylidene]aniline; N-(4-methoxyphenyl)-N-[(E)-3-methyl-2-butenylidene]amine | C12H15NO | 详情 | 详情 | |
| (XII) | 19155 | (3R,4S)-1-(4-methoxyphenyl)-4-(2-methyl-1-propenyl)-3-[(triisopropylsilyl)oxy]-2-azetidinone | C23H37NO3Si | 详情 | 详情 | |
| (XIII) | 19157 | tert-butyl (2S,3R)-2-(2-methyl-1-propenyl)-4-oxo-3-[(triisopropylsilyl)oxy]-1-azetidinecarboxylate | C21H39NO4Si | 详情 | 详情 |