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