保护的甲基-L-丝氨酸二环己基铵盐 、
4-氨基-1-苄基哌啶 、 以to obtain [(1S)-1-(methoxy-methyl)-2-oxo-2-[[1-(phenylmethyl)-4-piperidyl]amino]ethyl]-carbamic acid 1,1-dimethylethyl ester的产率得到[(S)-1-(methoxymethyl)-2-oxo-2-[[1-phenylmethyl-piperidin-4-yl]amino]ethyl]-carbamic acid 1,1-dimethylethyl ester