N4-benzoyl-3'-O-(tert-butyldimethylsilyl)-5'-O-(4-monomethoxytrityl)cytidine 、
乙酰丙酸 在
4-二甲氨基吡啶 N,N'-二环己基碳二亚胺 作用下,
以
1,4-二氧六环 为溶剂,
反应 6.0h,
以93%的产率得到4-Oxo-pentanoic acid (2R,3R,4R,5R)-2-(4-benzoylamino-2-oxo-2H-pyrimidin-1-yl)-4-(tert-butyl-dimethyl-silanyloxy)-5-[(4-methoxy-phenyl)-diphenyl-methoxymethyl]-tetrahydro-furan-3-yl ester