(S)-2-amino-N-((S)-1-(((S)-9-ethyl-9-hydroxy-10,13-dioxo-2,3,9,10,13,15-hexahydro-1H,12H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinolin-4-yl)amino)-1-oxopropan-2-yl)-3-methylbutanamide 、
N-马来酰亚胺-N-双(二聚乙二醇-羧酸) 在
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以23 mg的产率得到(S)-2-((2S,5S)-16-(3-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)propanoyl)-1-(((S)-9-ethyl-9-hydroxy-10,13-dioxo-2,3,9,10,13,15-hexahydro-1H,12H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinolin-4-yl)amino)-5-isopropyl-2-methyl-1,4,7-trioxo-10,13,19,22-tetraoxa-3,6,16-triazapentacosan-25-amido)-N-((S)-1-(((S)-9-ethyl-9-hydroxy-10,13-dioxo-2,3,9,10,13,15-hexahydro-1H,12H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinolin-4-yl)amino)-1-oxopropan-2-yl)-3-methylbutanamide