(2S,3S,4R,5R,6R,7S,8S,9S)-9-Methoxy-2,4,6,8-tetramethyl-undecane-1,3,5,7,11-pentaol 、
2,2-二甲氧基丙烷 在
camphor-10-sulfonic acid 作用下,
以51%的产率得到(4S,5R,6R)-4-[(1S,2R)-2-Methoxy-3-(1-methoxy-1-methyl-ethoxy)-1-methyl-propyl]-2,2,5-trimethyl-6-[(R)-1-((4S,5S)-2,2,5-trimethyl-[1,3]dioxan-4-yl)-ethyl]-[1,3]dioxane