(S)-4,4-difluoro-2-aminobutyric acid 2,5-difluoro-4-t-butoxycarbonylphenethylamide 、
(2S,4R)-1-(tert-butoxycarbonyl)-4-(7-methoxy-2-phenylquinolin-4-yloxy)pyrrolidine-2-carboxylic acid 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
二氯甲烷 为溶剂,
以96%的产率得到(2S,4R)-2-{(S)-1-[2-(4-tert-Butoxycarbonyl-2,6-difluoro-phenyl)-ethylcarbamoyl]-3,3-difluoro-propylcarbamoyl}-4-(7-methoxy-2-phenyl-quinolin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester