Gem-Difluorinated Homoallyl Alcohols, β-Hydroxy Ketones, and syn- and anti-1,3-Diols via γ,γ-Difluoroallylboronates
摘要:
gamma,gamma-Difluoroallylboronates have been prepared from trifluoroethanol and utilized for the allylboration of a variety of aldehydes to provide gem-difluorinated homoallylic alcohols. alpha-Chiral aldehydes were allylborated in 4:1-13:1 diastereoselectivity favoring the anti-isomer. A representative series of difluorinated hydroxyl enol ethers were converted to the corresponding alpha,alpha-difluoro-beta-hydroxy ketones. Diastereoselective reduction of one of these to either syn- and anti-1,3-diol was also studied.
Gem-Difluorinated Homoallyl Alcohols, β-Hydroxy Ketones, and syn- and anti-1,3-Diols via γ,γ-Difluoroallylboronates
摘要:
gamma,gamma-Difluoroallylboronates have been prepared from trifluoroethanol and utilized for the allylboration of a variety of aldehydes to provide gem-difluorinated homoallylic alcohols. alpha-Chiral aldehydes were allylborated in 4:1-13:1 diastereoselectivity favoring the anti-isomer. A representative series of difluorinated hydroxyl enol ethers were converted to the corresponding alpha,alpha-difluoro-beta-hydroxy ketones. Diastereoselective reduction of one of these to either syn- and anti-1,3-diol was also studied.
gamma,gamma-Difluoroallylboronates have been prepared from trifluoroethanol and utilized for the allylboration of a variety of aldehydes to provide gem-difluorinated homoallylic alcohols. alpha-Chiral aldehydes were allylborated in 4:1-13:1 diastereoselectivity favoring the anti-isomer. A representative series of difluorinated hydroxyl enol ethers were converted to the corresponding alpha,alpha-difluoro-beta-hydroxy ketones. Diastereoselective reduction of one of these to either syn- and anti-1,3-diol was also studied.