醋酸甲脒   、                                                                                      
Acetic acid (2R,3R,4S,5R)-4,5-diacetoxy-2-(5-amino-2-methoxy-1-methyl-6-oxo-1,6-dihydro-pyrimidin-4-ylamino)-tetrahydro-pyran-3-yl ester                                                                                                                                                                                              以
                                                                                         
乙二醇甲醚                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以60%的产率得到Acetic acid (2R,3R,4S,5R)-4,5-diacetoxy-2-(2-methoxy-1-methyl-6-oxo-1,6-dihydro-purin-9-yl)-tetrahydro-pyran-3-yl ester