(S)-2-((2-(1-allylcyclopropyl)ethoxy)carbonylamino)-3,3-dimethylbutanoic acid 、 (2S,4R)-methyl 4-methoxy-4-(6-methoxy-7-vinylnaphthalen-2-yl)pyrrolidine-2-carboxylate 在
N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran 、
乙酸乙酯 为溶剂,
以56%的产率得到(2S,4R)-methyl 1-((S)-2-((2-(1-allylcyclopropyl)ethoxy)carbonylamino)-3,3-dimethylbutanoyl)-4-methoxy-4-(6-methoxy-7-vinylnaphthalen-2-yl)pyrrolidine-2-carboxylate