5-methyl-3-(2-oxidoisoquinolin-2-ium-7-yl)-1,2,4-oxadiazole 、
methyl (4S)-4-amino-1-methyl-L-prolinate dihydrochloride 在
N,N-二异丙基乙胺 、 bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate 作用下,
以
二氯甲烷 为溶剂,
以54 %的产率得到methyl (2S,4S)-1-methyl-4-[[7-(5-methyl-1,2,4-oxadiazol-3-yl)-1-isoquinolyl]amino]pyrrolidine-2-carboxylate