(3E,5R,6R,7R,8R,9E)-7-hydroxy-6,8-dimethyl-10-(N-methylformamido)-1-phenyldeca-3,9-dien-5-yl dimethyl-L-alaninate 、
乙酸酐 在
吡啶 、
4-二甲氨基吡啶 作用下,
以81%的产率得到[(3E,5R,6S,7R,8R,9E)-7-acetyloxy-10-[formyl(methyl)amino]-6,8-dimethyl-1-phenyldeca-3,9-dien-5-yl] (2S)-2-(dimethylamino)propanoate