(S)-2-((S)-1-(tert-butoxycarbonyl)-5,5-dimethylpyrrolidin-2-yl)-2-(4-chlorophenyl)acetic acid   、                                                                                      
(R)-5-methyl-4-(piperidin-4-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidine                                                                                                                                                              在
                                                                                                                                         O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate                                                                                                                                                                                                                               
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以84%的产率得到(S)-tert-butyl 5-((S)-1-(4-chlorophenyl)-2-(4-((R)-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperidin-1-yl)-2-oxoethyl)-2,2-dimethylpyrrolidine-1-carboxylate