6-methyl-1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-2,4(1H,3H)-pyrimidinedione                                                                                                                                                              在
                                                                                                                                                                                 
tetraphosphorus decasulfide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以98%的产率得到(2R,3R,4R,5R)-2-((benzoyloxy)methyl)-5-(4-mercapto-6-methyl-2-oxopyrimidin-1(2H)-yl)tetrahydrofuran-3,4-diyl dibenzoate