2-methylpropyl [(2R,4R,5R)-4-[tert-butyl(dimethyl)silyl]oxy-2-[[tert-butyl(dimethyl)silyl]oxymethyl]-5-(2,4-dioxopyrimidin-1-yl)-3-hydroxyoxolan-3-yl]methanesulfonate 在
吡啶 、
氯化亚砜 作用下,
反应 5.0h,
以79%的产率得到[(2S,4R,5R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-(tert-butyl-dimethyl-silanyloxymethyl)-5-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-dihydro-furan-(3Z)-ylidene]-methanesulfonic acid isobutyl ester