(S)-2-(4-bromophenyl)-3-(tert-butylamino)propanoic acid   、                                                                                      
(5R,7R)-5-methyl-4-(1,2,3,6-tetrahydropyridin-4-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol   、                                                                                      
三氟乙酸                                                                                                                                                              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 1.0h,
                                                                                                                以24%的产率得到(S)-2-(4-bromophenyl)-3-(tert-butylamino)-1-(4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)-5,6-dihydropiperidin-1(2H)-yl)propan-1-one ditrifluoroacetic acid