(2R,5S,7R,11R)-14,21-dimethoxy-5,9,9-trimethyl-17-[(2R,4R,5R,6R)-6-methyl-4,5-bis(phenylmethoxy)oxan-2-yl]-5,16-bis(phenylmethoxy)-8,10-dioxapentacyclo[11.8.0.02,7.07,11.015,20]henicosa-1(21),13,15(20),16,18-pentaene-2,3-diol 在
草酰氯 、
二甲基亚砜 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
以90%的产率得到(2S,5R,7R,11R)-2-hydroxy-14,21-dimethoxy-5,9,9-trimethyl-17-[(2R,4R,5R,6R)-6-methyl-4,5-bis(phenylmethoxy)oxan-2-yl]-5,16-bis(phenylmethoxy)-8,10-dioxapentacyclo[11.8.0.02,7.07,11.015,20]henicosa-1(21),13,15(20),16,18-pentaen-3-one