NH2-D-Val-Leu-Phe-Lys(Boc)-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44.5%的产率得到tert-butyl (4-((2S,5S,8R,11S,14S)-14-benzyl-5,11-diisobutyl-8-isopropyl-3,6,9,12,15-pentaoxo-1,4,7,10,13-pentaazacyclopentadecan-2-yl)butyl)carbamate