去异丁基环索奈德 、
3,5-吡啶二甲酸 、
carbonic acid (R)-[2-[tert-butoxycarbonyl-[6-(4-phenylbutoxy)hexyl]amino]-1-[4-(di-tert-butoxyphosphoryloxy)-3-hydroxymethylphenyl]ethyl]ester tert-butyl ester 在
N,N-二异丙基乙胺 、
Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以23%的产率得到pyridine-3,5-dicarboxylic acid [5-[1(R)-[(tert-butoxycarbonyl)oxy]-2-[(tert-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