4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl (5-hydroxy-2,2-dimethyl-1-((2,2,5,6,8-pentamethylchroman-7-yl)oxy)pentyl)carbamate 、
4-羧丁基三苯基溴化膦 在
4-二甲氨基吡啶 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 4.5h,
以78%的产率得到[5-[4,4-Dimethyl-5-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)oxy]-5-[[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]methoxycarbonylamino]pentoxy]-5-oxopentyl]-triphenylphosphanium;bromide