(Benzyl-but-3-enyl-amino)-acetic acid (1R,2S,5R)-5-methyl-2-(1-methyl-1-phenyl-ethyl)-cyclohexyl ester 在
ammonium chloride 、 zinc dibromide 、
lithium diisopropyl amide 作用下,
生成 (2S,3R)-1-Benzyl-3-methyl-pyrrolidine-2-carboxylic acid (1R,2S,5R)-5-methyl-2-(1-methyl-1-phenyl-ethyl)-cyclohexyl ester 、 (2S,3S)-1-Benzyl-3-methyl-pyrrolidine-2-carboxylic acid (1R,2S,5R)-5-methyl-2-(1-methyl-1-phenyl-ethyl)-cyclohexyl ester