N'-[1-(2-hydroxymethyl-[1,3]dioxolan-4-yl)-2-oxo-1,2-dihydro-pyrimidin-4-yl]-N,N-dimethyl-formamidine   、                                                                                      
6-(benzyl-tert-butoxycarbonyl-amino)-2,2-dimethyl-hexanoic acid                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇   、                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以28%的产率得到6-(Benzyl-tert-butoxycarbonyl-amino)-2,2-dimethyl-hexanoic acid 4-[4-(dimethylamino-methyleneamino)-2-oxo-2H-pyrimidin-1-yl]-[1,3]dioxolan-2-ylmethyl Ester