6-{2-[(1S,2R)-1-{[2-((R)-1-tert-Butoxycarbonylamino-2-hydroxy-2-methyl-propyl)-thiazole-4-carbonyl]-amino}-2-(tert-butyl-diphenyl-silanyloxy)-propyl]-thiazol-4-yl}-5-(4-ethoxycarbonyl-thiazol-2-yl)-pyridine-2-carboxylic acid 在
氯甲酸乙酯 、
三乙胺 、
ammonium hydroxide 作用下,
以
四氢呋喃 为溶剂,
以88%的产率得到2-(2-{2-[(1S,2R)-1-{[2-((R)-1-tert-Butoxycarbonylamino-2-hydroxy-2-methyl-propyl)-thiazole-4-carbonyl]-amino}-2-(tert-butyl-diphenyl-silanyloxy)-propyl]-thiazol-4-yl}-6-carbamoyl-pyridin-3-yl)-thiazole-4-carboxylic acid ethyl ester