[[11β,16α]-[15,16-((R)-cyclohexylmethylene)bis(oxy)]-11-hydroxypregna-1,4-diene-3,20-dion-21-yl] chloroformate 、
carbonic acid 1-[3-aminomethyl-4-(di-tert-butoxyphosphoryloxy)phenyl]-2-[(tert-butoxycarbonyl)[6-(4-phenylbutoxy)hexyl]-amino]ethyl ester tert-butyf ester 在
1,2,2,6,6-五甲基哌啶 作用下,
以
乙腈 为溶剂,
以32%的产率得到[5-[1-[(tert-butoxycarbonyl)oxy]-2-[(t-butoxycarbonyl)-6-(4-phenylbutoxy)hexylamino]ethyl]-2-di-tert-butoxyphosphonooxybenzyl]carbamic acid [[11β,16α]-[16,17-((R)-cyclohexylmethylene)bis(oxy)]-11-hydroxypreqna-1,4-diene-3,20-dion-21-yl]ester