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【结 构 式】

【分子编号】48267

【品名】(2S)-2-methoxy-2-phenyl-1-ethanol

【CA登记号】66051-01-2

【 分 子 式 】C9H12O2

【 分 子 量 】152.19308

【元素组成】C 71.03% H 7.95% O 21.03%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(XI)

The two enantiomers of amlodipine have been obtained as follows: The reaction of 2-azidoethanol (I) with chloroacetic acid (II) by means of NaH in THF gives 2-(2-azidoethoxy)acetic acid (III), which is condensed with Meldrum's acid (IV) and 3-hydroxypropionitrile (V) in dichloromethane to yield the 2-cyanoethyl acetoacetate (VI). The cyclization of (VI) with 2-chlorobenzaldehyde (VII) and methyl 3-aminocrotonate (VIII) in refluxing ethanol affords the dihydropyridine (IX), which is selectively hydrolyzed at the 2-cyanoethylester with NaOH to give the dihydropyridine monocarboxylic acid (X). The esterification of (X) with (S)-2-methoxy-2-phenylethanol (XI) by means of CDI in dichloromethane provides the ester (XII) as a diastereomeric mixture, which is separated by chromatography to furnish diastereomers (XXI A) and (XII B). The selective ethanolysis of (XII A) and (XII B) with sodium ethoxide in refluxing ethanol/diglyme gives enantiomers (+)-(XIII) and (-)-(XIII), which are finally reduced with H2 over Pd/CaCO3 in ethanol to afford the (-)- and (+)-isomers, respectively, of the target compound.

1 Arrowsmith, J.E.; et al.; Long-acting dihydropyridine calcium antagonists. 1. 2-Alkoxymethyl derivatives incorporating basic substituents. J Med Chem 1986, 29, 9, 1696.
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) 24111 2-azido-1-ethanol C2H5N3O 详情 详情
(II) 11847 2-Chloroacetic acid; Chloroacetic Acid 79-11-8 C2H3ClO2 详情 详情
(III) 48263 2-(2-azidoethoxy)acetic acid C4H7N3O3 详情 详情
(IV) 14738 Meldrum's acid; 2,2-dimethyl-1,3-dioxane-4,6-dione;Malonic acid cyclic isopropylidene ester 2033-24-1 C6H8O4 详情 详情
(V) 14029 Ethylene cyanohydrin; ECN; 3-Hydroxypropanenitrile 109-78-4 C3H5NO 详情 详情
(VI) 48264 2-cyanoethyl 4-(2-azidoethoxy)-3-oxobutanoate C9H12N4O4 详情 详情
(VII) 24114 2-chlorobenzaldehyde 89-98-5 C7H5ClO 详情 详情
(VIII) 11372 Methyl (E)-3-amino-2-butenoate; Methyl 3-aminocrotonate C5H9NO2 详情 详情
(IX) 48265 3-(2-cyanoethyl) 5-methyl 2-[(2-azidoethoxy)methyl]-4-(2-chlorophenyl)-6-methyl-1,4-dihydro-3,5-pyridinedicarboxylate C21H22ClN5O5 详情 详情
(X) 48266 2-[(2-azidoethoxy)methyl]-4-(2-chlorophenyl)-5-(methoxycarbonyl)-6-methyl-1,4-dihydro-3-pyridinecarboxylic acid C18H19ClN4O5 详情 详情
(XI) 48267 (2S)-2-methoxy-2-phenyl-1-ethanol 66051-01-2 C9H12O2 详情 详情
(XII) 48268 3-[(2S)-2-methoxy-2-phenylethyl] 5-methyl 2-[(2-azidoethoxy)methyl]-4-(2-chlorophenyl)-6-methyl-1,4-dihydro-3,5-pyridinedicarboxylate C27H29ClN4O6 详情 详情
(XIII) 24115 3-ethyl 5-methyl 2-[(2-azidoethoxy)methyl]-4-(2-chlorophenyl)-6-methyl-1,4-dihydro-3,5-pyridinedicarboxylate C20H23ClN4O5 详情 详情
Extended Information