(S)-3,4-dimethoxyphenethyl piperidine-2-carboxylate 、
N,N-二异丙基乙胺 、
O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate 、 2-((1S,2R)-1-hydroxy-2-methylcyclohexyl)-2-oxoacetic acid 以to yield 3,4-dimethoxyphenethyl 1-(2-((1S,2R)-1-hydroxy-2-methylcyclohexyl)-2-oxoacetyl)piperidine-2-carboxylate (25 mg, 0.054 mmol, 49%)的产率得到3,4-dimethoxyphenethyl 1-(2-((1S,2R)-1-hydroxy-2-methylcyclohexyl)-2-oxoacetyl)piperidine-2-carboxylate