甲基锂 、 (S)-2-[(R)-2-(tert-Butyl-diphenyl-silanyloxy)-1-methyl-ethyl]-2,3-dihydro-pyran-4-one 在
lithium bromide 作用下,
以
四氢呋喃 为溶剂,
生成
(2S,4S)-2-[(R)-2-(tert-Butyl-diphenyl-silanyloxy)-1-methyl-ethyl]-4-methyl-3,4-dihydro-2H-pyran-4-ol 、 (2S,4R)-2-[(R)-2-(tert-Butyl-diphenyl-silanyloxy)-1-methyl-ethyl]-4-methyl-3,4-dihydro-2H-pyran-4-ol