[[11β,16α]-[15,16-((R)-cyclohexylmethylene)bis(oxy)]-11-hydroxypregna-1,4-diene-3,20-dion-21-yl] chloroformate 、
carbonic acid (R)-[2-[tert-butoxycarbonyl-[6-(4-phenylbutoxy)hexyl]amino]-1-[4-(di-tert-butoxyphosphoryloxy)-3-hydroxymethylphenyl]ethyl]ester tert-butyl ester 在
4-二甲氨基吡啶 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 96.0h,
以30%的产率得到carbonic acid [5-[1(R)-[(t-butoxycarbonyl)oxy]-2-[t-butoxycarbonyl[6-(4-phenylbutoxy)hexyl]amino]ethyl]-2-(di-tert-butoxyphosphoryloxy)benzyl]ester [[11β,16α]-[16,17-((R)-cyclohexylmethylene)bis(oxy)]-11-hydroxypregna-1,4-diene-3,20-dion-21-yl]ester