(3S)-4-[[(2S)-1,5-dioxo-1,5-bis(phenylmethoxy)pentan-2-yl]amino]-3-[[(2R)-3-(4-heptoxyphenoxy)-2-[[(2R,3S,4R,5R,6S)-6-(hydroxymethyl)-3,4,5-tris(phenylmethoxy)oxane-2-carbonyl]amino]propanoyl]amino]-4-oxobutanoic acid 在
4-二甲氨基吡啶 、
4-(dimethylamino)pyridine hydrochloride 、
1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 作用下,
以50%的产率得到dibenzyl (2S)-2-[[(1R,4R,7S,12S,13R,14R,15S)-4-[(4-heptoxyphenoxy)methyl]-2,5,9-trioxo-13,14,15-tris(phenylmethoxy)-10,16-dioxa-3,6-diazabicyclo[10.3.1]hexadecane-7-carbonyl]amino]pentanedioate