[(3S,6S,7R,8R)-8-[(4-aminophenyl)methyl]-3-[(3-hydroxy-4-methoxypyridine-2-carbonyl)amino]-6-methyl-4,9-dioxo-1,5-dioxonan-7-yl] 2-methylpropanoate 、
甲酸 在
乙酸酐 作用下,
以
二氯甲烷 为溶剂,
以46%的产率得到[(3S,6S,7R,8R)-8-[(4-formamidophenyl)methyl]-3-[(3-hydroxy-4-methoxypyridine-2-carbonyl)amino]-6-methyl-4,9-dioxo-1,5-dioxonan-7-yl] 2-methylpropanoate