(3S)-4-azido-3-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonylcarbamothioylamino]-N-tritylbutanamide 、 在
1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 4.0h,
以362 mg的产率得到tert-butyl (4S)-5-[[(E)-N-[(2S)-1-[[(E)-N-[(2S)-1-[[(Z)-N-[(2S)-1-[[(Z)-N-[(2S)-1-azido-4-oxo-4-(tritylamino)butan-2-yl]-N'-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonyl]carbamimidoyl]amino]-4-methylpentan-2-yl]-N'-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonyl]carbamimidoyl]amino]-3-[4-[(2-methylpropan-2-yl)oxy]phenyl]propan-2-yl]-N'-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonyl]carbamimidoyl]amino]-6-[(2-methylpropan-2-yl)oxycarbonylamino]hexan-2-yl]-N'-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonyl]carbamimidoyl]amino]-4-[[(E)-N-[(2,4-dimethoxyphenyl)methyl]-N'-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonyl]carbamimidoyl]amino]pentanoate