A series of para-substituted benzhydrylamines 6 were obtained by substitution of the corresponding benzhydrol precursors 1 with phenyl carbamate 2 under acidic conditions, followed by basic hydrolysis of the carbamate intermediates 3. One unsymmetrical intermediate 3i has been resolved by preparative chiral chromatography. Subsequent deprotection of the carbamate function led to the recovery of enantiomerically pure (+)- and (-)-4-chlorobenzhydryl amines.
一系列对位取代的苯
乙胺 6 通过在酸性条件下用
苯基氨基甲酸酯 2 替代相应的
苯乙醇前体 1 获得,随后对
氨基甲酸酯中间体 3 进行碱性
水解。一个非对称中间体 3i 已通过制备性手性色谱法分离。随后去保护
氨基甲酸酯官能团,得到光学活性的 (+)-和 (-)-
4-氯苯乙胺。