(2S,3S,4S,5R)-5-[(4R,6R)-6-[[(4R)-2,2-dimethyl-1,3-dioxan-4-yl]methyl]-2,2-dimethyl-1,3-dioxan-4-yl]-3-methyl-1-[(4R,5S,6R)-2,2,5-trimethyl-6-[(1S)-1-[(4S,5R)-2,2,5-trimethyl-1,3-dioxan-4-yl]ethyl]-1,3-dioxan-4-yl]hexane-2,4-diol 、
2,2-二甲氧基丙烷 在
4-甲基苯磺酸吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 72.0h,
以85%的产率得到(4R,5S,6S)-4-[(1S)-1-[(4R,6R)-6-[[(4R)-2,2-dimethyl-1,3-dioxan-4-yl]methyl]-2,2-dimethyl-1,3-dioxan-4-yl]ethyl]-2,2,5-trimethyl-6-[[(4R,5S,6R)-2,2,5-trimethyl-6-[(1S)-1-[(4S,5R)-2,2,5-trimethyl-1,3-dioxan-4-yl]ethyl]-1,3-dioxan-4-yl]methyl]-1,3-dioxane