NH2-D-Val-D-Leu-NMe-Phe-Leu-Leu-OH                                                                                                                                                              在
                                                                                                                                                                                 O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate   、                                                                                                  
N,N-二异丙基乙胺   、                                                                                                  
Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-)                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以8.8%的产率得到(3R,6R,9S,12S,15S)-15-benzyl-3,9,12-triisobutyl-6-isopropyl-1-methyl-1,4,7,10,13-pentaazacyclopentadecane-2,5,8,11,14-pentaone