A straightforward synthesis of enantiomerically pure (4R,5S)-5-oxazolidinecarboxylic acid, 2-oxo-4-[(t-butyldimethylsilyloxy)methyl]-, benzyl ester and of (4S,5S)-4-oxazolidinecarboxylic acid, 2-oxo-5-[(t-butyldimethylsilyloxy)methyl]-, benzyl ester was envisaged starting from readily available l-aspartic acid. The key step is the diastereoselective addition of iodine with the introduction of a new stereogenic centre.
一种简单的合成方法被设想用于手性纯(4R,5S)-5-氧杂植物酸、2-氧-4-[(t-丁基二甲基
硅氧基)甲基]-苄酯和(4S,5S)-4-氧杂植物酸、2-氧-5-[(t-丁基二甲基
硅氧基)甲基]-苄酯,起始材料为容易获得的
L-天冬氨酸。关键步骤是
碘的二源选择性加成,伴随引入一个新的立体中心。