甲基碘化镁 、
3-[(2S,3S,6S)-3-(tert-Butyl-dimethyl-silanyloxy)-6-methyl-tetrahydro-pyran-2-yloxy]-propionaldehyde 在
4 A molecular sieve 、 magnesium bromide 作用下,
生成 (S)-4-[(2S,3S,6S)-3-(tert-Butyl-dimethyl-silanyloxy)-6-methyl-tetrahydro-pyran-2-yloxy]-butan-2-ol 、 (R)-4-[(2S,3S,6S)-3-(tert-Butyl-dimethyl-silanyloxy)-6-methyl-tetrahydro-pyran-2-yloxy]-butan-2-ol