lithium 1-tert-butoxycarbonyl-3-(5-chloro-pyridin-2-yl)-azetidine-3-carboxylate 、
(2S,4R)-4-(2-chloro-4-methoxy-benzenesulfonyl)-pyrrolidine-2-carboxylic acid (1-cyano-cyclopropyl)-amide 在
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
乙腈 为溶剂,
反应 18.0h,
以48%的产率得到3-[(2S,4R)-4-(2-chloro-4-methoxy-benzenesulfonyl)-2-(1-cyano-cyclopropylcarbamoyl)-pyrrolidine-1-carbonyl]-3-(5-chloro-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester