(2R,3R,4R)-2-((benzoyloxy)methyl)-5-(4-oxo-3,4-dihydrothieno[3,4-d]pyrimidin-7-yl)tetrahydrofuran-3,4-diyl dibenzoate 在
吡啶 、
四磷十氧化物 作用下,
以43%的产率得到(2R,3S,4S,5R)-2-(benzoyloxymethyl)-5-(4-thioxo-3,4-dihydrothieno[3,4-b]pyrimidin-7-yl)tertahydrofuran-3,4-diyl dibenzoate