17-{4-[6-(4-{3-[2-(tert-butoxycarbonylamino)-3-(tritylthio)propanoyloxy]-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl}pentanoyloxy)hexa-2,4-diynyloxy]-1-methyl-4-oxobutyl}-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-3-yl 3,5-bis[(dimethoxyphosphoryl)-methyl]benzoate 在
lithium bromide 作用下,
以
乙腈 为溶剂,
以99%的产率得到17-(4-[6-(4-{3-[2-(tert-butoxycarbonylamino)-3-(tritylthio)propanoyloxy]-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-17-yl}pentanoyloxy)hexa-2,4-diynyloxy]-1-methyl-4-oxobutyl)-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-3-yl 3,5-bis{[hydroxy(methoxy)phosphoryl]methyl}benzoate dilithium salt