(2S,3R,4S,6R)-4-(dimethylamino)-2-((3R,4S,5S,6R,7R,9R,10S,11S,12R,14R)-14-ethyl-4,10,12-trihydroxy-7-methoxy-3,5,7,9,11-pentamethyl-13-methylene-2-oxooxacyclotetradecan-6-yloxy)-6-methyltetrahydro-2H-pyran-3-yl benzoate 、
2,2-二甲氧基丙烷 在
4-甲基苯磺酸吡啶 作用下,
以
丙酮 为溶剂,
反应 18.0h,
以91.3%的产率得到(2S,3R,4S,6R)-4-(dimethylamino)-2-((1R,3R,6R,7S,8S,9R,10R,12R,13S,17S)-3-ethyl-7-hydroxy-10-methoxy-6,8,10,12,15,15,17-heptamethyl-2-methylene-5-oxo-4,14,16-trioxabicyclo[11.3.1]heptadecan-9-yloxy)-6-methyltetrahydro-2H-pyran-3-yl benzoate