2',4"-di-O-acetyl-3-O-(2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl)-4'-O-demycarosyl-3'-N-oxide-tylosin ethylene acetal 在
三苯基膦 作用下,
以
二氯甲烷 为溶剂,
反应 72.0h,
以80%的产率得到2',4''-di-O-acetyl-3-O-(2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl)-4'-O-demycarosyl-tylosin ethylene acetal