6-azido-9-[2',3'-O-(1R)-benzylidene-β-D-ribofuranosyl]purine 、
bis(O-benzylphosphonomethyl)phosphinic acid benzyl ester 在
三苯基膦 、
偶氮二甲酸二乙酯 作用下,
以
四氢呋喃 为溶剂,
以67%的产率得到9-[(2R,3aR,4R,6R,6aR)-6-[[[[[(2R,3aR,4R,6R,6aR)-4-(6-azidopurin-9-yl)-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]methoxy-phenylmethoxyphosphoryl]methyl-phenylmethoxyphosphoryl]methyl-phenylmethoxyphosphoryl]oxymethyl]-2-phenyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-6-azidopurine