Stereospecific Synthesis of (R)- and (S)-Baclofen and (R)- and (S)-PCPGABA (4-Amino-2-(4-chlorophenyl)butyric Acid) via (R)- and (S)-3-(4-Chlorophenyl)pyrrolidines.
作者:Shigeyuki YOSHIFUJI、Mamoru KANAME
DOI:10.1248/cpb.43.1302
日期:——
(R)- and (S)-Baclofen and (R)- and (S)-PCPGABA [4-amino-2-(4-chlorophenyl)butyric acid] were stereospecifically synthesized via (R)- and (S)-3-(4-chlorophenyl)pyrrolidines, starting from trans-4-hydroxy-L-proline. The syntheses involve two key operations, namely, 1) a stereoselective hydrogenation of dehydroproline derivatives controlled by the C-2 carboxyl function and 2) an effective ruthenium tetroxide oxidation to prepare chiral 3- and 4-(4-chlorophenyl)pyrrolidin-2-ones, which are dehydrated precursors of the target molecules.
(R)-和(S)-巴克洛芬以及(R)-和(S)-PCPGABA [4-氨基-2-(4-氯苯基)丁酸] 是通过(R)-和(S)-3-(4-氯苯基)吡咯烷从反式-4-羟基-L-脯氨酸立体选择性合成的。合成过程包括两个关键操作,即:1) 由C-2羧基功能控制的脱氢脯氨酸衍生物的立体选择性氢化;2) 有效的四氧化铑氧化反应,以制备手性3-和4-(4-氯苯基)吡咯烷-2-酮,这些化合物是目标分子的脱水前体。