1-(6S-hydroxymethyl-2-phenyl-tetrahydro-3aS,6aS-furo[3,4-d][1,3]dioxol-4S-yl)-1H-[1,2,4]triazole-3-carboxylic acid amide   、                                                                                      
N-benzyloxycarbonyl-L-valyl-L-proline                                                                                                                                                              在
                                                                                                                                                                                 benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate   、                                                                                                  
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                    反应 18.0h,
                                                                                                                以53%的产率得到1-(2S-benzyloxycarbonylamino-3-methyl-butyryl)-pyrrolidine-2S-carboxylic acid 6S-(3-carbamoyl-[1,2,4]triazol-1-yl)-2-phenyl-tetrahydro-3aS,6aS-furo[3,4-d][1,3]dioxol-4S-ylmethyl ester