(R)-3-(tert-Butyl-dimethyl-silanyloxy)-3-(4-methyl-furan-3-yl)-propionic acid (1R,2R,3R)-3-(tert-butyl-dimethyl-silanyloxy)-1-isopropyl-2-methoxy-5-oxo-heptyl ester 生成 (R)-3-(tert-Butyl-dimethyl-silanyloxy)-3-(4-methyl-2,5-dioxo-2,5-dihydro-furan-3-yl)-propionic acid (1R,2R,3R)-3-(tert-butyl-dimethyl-silanyloxy)-1-isopropyl-2-methoxy-5-oxo-heptyl ester