6,6-Dimethyl-4-oxo-5,6-dihydro-4H-pyran-3-carboxylic acid ethyl ester 、
tert-Butyl-(3,3-dimethoxy-1-methylene-allyloxy)-dimethyl-silane 反应 8.0h,
生成 (4aR,8aR)-7-(tert-Butyl-dimethyl-silanyloxy)-5,5-dimethoxy-2,2-dimethyl-4-oxo-3,4,8,8a-tetrahydro-2H,5H-chromene-4a-carboxylic acid ethyl ester