(R)-2-((7-methyl-2-oxo-4-propyl-2H-chromen-5-yl)oxy)propanoic acid 、
methyl (3S)-1,2,3,4-tetrahydro-β-carboline-3-carboxylate 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以83%的产率得到methyl (S)-2-((R)-2-((7-methyl-2-oxo-4-propyl-2H-chromen-5-yl)oxy)propanoyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate