(S)-2-((benzyloxycarbonyl)(methyl)amino)-4-tert-butoxy-4-oxobutanoic acid dicyclohexylammonium salt 、
4-异丙基苯胺 、
甲醇盐酸 以to give (S)-N-(4-Isopropyl-phenyl)-3-methylamino-succinamic acid tert-butyl ester-HCl, MS的产率得到(S)-N-(4-Isopropyl-phenyl)-3-methylamino-succinamic acid tert-butyl ester-HCl