(2R,3R)-6-((R)-4-Hydroxy-1,1,3-trimethyl-butyl)-2-isopropyl-3-methyl-2,3-dihydro-pyran-4-one 在
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 1.5h,
生成 (2R,3R,6S,7R,9R)-4-(tert-Butyl-dimethyl-silanyloxy)-2-isopropyl-3,9,11,11-tetramethyl-8-oxo-1-oxa-spiro[5.5]undec-4-ene-7-carboxylic acid 2-trimethylsilanyl-ethyl ester