三氟乙酸酐   、                                                                                      
1-[(3aR,4R,6R,6aR)-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-N-(2-aminoethyl)-2,4-dioxopyrimidine-5-carboxamide                                                                                                                                                                                              以
                                                                                         
吡啶                                                                                  为溶剂,
                                                                                                                                                                                        以0.173 g的产率得到1-[(3aR,4R,6R,6aR)-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-2,4-dioxo-N-[2-[(2,2,2-trifluoroacetyl)amino]ethyl]pyrimidine-5-carboxamide