2-[[(2S)-2-[[(2S)-1-[(2S)-2-[[(2S,3S)-2-[[(2S)-2-[[(3S)-3-[[(2S)-2-[[1-[[(2S)-1-[(2S)-2-amino-4-[3,5-difluoro-4-(trifluoromethyl)phenyl]butanoyl]pyrrolidine-2-carbonyl]amino]cyclopentanecarbonyl]-methyl-amino]-2-cyclopentylacetyl]-methyl-amino]-4-(dimethylamino)-4-oxobutanoyl]-methyl-amino]-4-methyl-pentanoyl]amino]-3-methyl-pentanoyl]-methyl-amino]propanoyl]azetidine-2-carbonyl]ethyl-amino]-3-(p-tolyl)propanoyl]-methyl-amino]acetic acid 在
benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
2-甲基四氢呋喃 为溶剂,
以79.2%的产率得到(5S,8S,11S,15S,18S,23aS,29S,35S,37aS)-8-((S)-sec-butyl)-18-cyclopentyl-29-(3,5-difluoro-4-(trifluoromethyl)phenethyl)-36-ethyl-11-isobutyl-N,N,5,6,12,16,19,33-octamethyl-35-(4-methylbenzyl)-4,7,10,13,17,20,23,28,31,34,37-undecaoxotetratriacontahydro-2H,4H-spiro[azeto[2,1-u]pyrrolo[2,1-i][1,4,7,10,13,16,19,22,25,28,31]undecaazacyclotetratriacontin-21,1'-cyclopentane]-15-carboxamide