(2R,3S,4S,5S)-2-(benzoyloxymethyl)-5-(4-oxo-3,4-dihydrothieno[3,4-b]pyrimidin-7-yl)tertahydrofuran-3,4-diyl dibenzoate 在
吡啶 、
tetraphosphorus decasulfide 作用下,
反应 1.75h,
以78%的产率得到7-(2,3,5-tri-O-benzoyl-α-D-ribofuranosyl)thieno<3,4-d>pyrimidine-4(3H)-thione