A new sequential defluorination route to α-fluoro-α,β-unsaturated ketones from trifluoromethyl ketones
作者:Hiroshi Hata、Takeshi Kobayashi、Hideki Amii、Kenji Uneyama、John T. Welch
DOI:10.1016/s0040-4039(02)01343-6
日期:2002.8
double defluorination. Trifluoromethyl ketones were transformed to β,β-difluoroenol silyl ethers which were then coupled with aldehydes and ketones to β-hydroxy-α,α-difluoroketones. A second Mg-promoted defluorination of the hydroxyketones followed by acid-catalyzed hydrolysis of γ-hydroxy-β-fluoroenol silyl ethers provided α-fluoro-α,β-unsaturated ketones as a final product.
由三氟甲基酮经涉及镁金属促进的连续双脱氟的序列,由三氟甲基酮制备α-氟-α,β-不饱和酮。将三氟甲基酮转化为β,β-二氟烯醇甲硅烷基醚,然后将其与醛和酮偶合为β-羟基-α,α-二氟酮。镁的第二次Mg促进的羟基酮的脱氟,然后酸催化的γ-羟基-β-芴醇甲硅烷基醚的水解,提供了最终产物α-氟-α,β-不饱和酮。