(3R,5R,7S,9R,11R)-9,11-Bis-(tert-butyl-diphenyl-silanyloxy)-3,5,7-trihydroxy-hexacosanoic acid tert-butyl ester 在
camphor-10-sulfonic acid 作用下,
以
甲苯 为溶剂,
以54%的产率得到(4R,6R)-6-[(2S,4R,6R)-4,6-Bis-(tert-butyl-diphenyl-silanyloxy)-2-hydroxy-henicosyl]-4-hydroxy-tetrahydro-pyran-2-one