4-(2,3-di-O-benzoyl-β-D-threofuranosyl)-5-ethoxycarbonyl-1,2,3,4-tetrahydro-6-methyl-2-oxopyrimidine                                                                                                                                                              在
                                                                                                                                                                                 
sodium methylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以0.07 g的产率得到2',6-anhydro-(5-ethoxycarbonylperhydro-6-hydroxy-6-methyl-2-oxo-4-β-D-threofuranosylpyrimidine)