(S)-[6-(tert-Butyl-dimethyl-silanyloxy)-benzo[1,3]dioxol-5-yl]-((1R,4aR,8aR)-2,5,5,8a-tetramethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-methanol 在
camphor-10-sulfonic acid 作用下,
以
二氯甲烷 为溶剂,
以85%的产率得到6-[1-((1R,4aR,8aR)-2,5,5,8a-Tetramethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-meth-(Z)-ylidene]-6H-benzo[1,3]dioxol-5-one