(S)-2-((benzyloxycarbonyl)(methyl)amino)-4-tert-butoxy-4-oxobutanoic acid dicyclohexylammonium salt 、
2-苯乙胺 、
甲醇盐酸 以to give (S)-N-Benzyl-N-methyl-3-methylamino-succinamic acid tert-butyl ester-HCl, MS的产率得到(S)-N-Benzyl-N-methyl-3-methylamino-succinamic acid tert-butyl ester-HCl