methyl [(3S,5S,7S)-7-{(1E,3E)-5-[(2S,3S,5R,6R)-5-{[(2Z,4S)-4-hydroxypent-2-enoyl]amino}-3,6-dimethyltetrahydro-2H-pyran-2-yl]-3-methylpenta-1,3-dien-1-yl}-1,6-dioxaspiro[2.5]oct-5-yl]acetate 、
3-[2-({N-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-alanyl}amino)phenyl]propanoic acid 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 4.5h,
以21%的产率得到(2S,3Z)-5-{[(2R,3R,5S,6S)-6-{(2E,4E)-5-[(3S,5S,7S)-7-(2-methoxy-2-oxoethyl)-1,6-dioxaspiro[2.5]oct-5-yl]-3-methylpenta-2,4-dien-1-yl}-2,5-dimethyltetrahydro-2H-pyran-3-yl]amino}-5-oxopent-3-en-2-yl 3-[2-({N-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-alanyl}amino)phenyl]propanoate