(R)-3-[N-(5'-chloro-2'-fluorobiphenyl-4-ylmethyl)hydrazino]-2-hydroxy-2-methylpropionic acid ethyl ester 在
盐酸 、 DIPEA 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
1,4-二氧六环 、
正庚醇 、
N,N-二甲基甲酰胺 为溶剂,
生成 (R)-3-[N-(5'-Chloro-2'-fluorobiphenyl-4-ylmethyl)-N'-(3-hydroxy-isoxazole-5-carbonyl)-hydrazino]-2-hydroxy-2-methyl-propionic acid heptyl ester