A New, General Route to γ,δ-Unsaturated α,α-Dichloroketones from Allyl 2,2,2-Trichloroethyl Ethers via the [3,3]Sigmatropic Rearrangement of Intermediary 2,2-Dichlorovinyl Ethers
A New, General Route to γ,δ-Unsaturated α,α-Dichloroketones from Allyl 2,2,2-Trichloroethyl Ethers via the [3,3]Sigmatropic Rearrangement of Intermediary 2,2-Dichlorovinyl Ethers
Stereocontrol in radical cyclization: Stereoselective synthesis of 2,4-cis and 2,4-trans tetrahydrofuran derivatives via mono- or dichloromethyl radical.
作者:Yoshihiko Watanabe、Takeshi Endo
DOI:10.1016/s0040-4039(00)80085-4
日期:1988.1
A novel stereocontrol method for the preparation of 2,4-disubstituted tetrahydrofurans was presented. 2,4-Cis-disubstituted-3,3-dichlorotetrahydrofurans were provided predominantly by the radicalcyclization of allyl-2,2,2-trichloroethylethers with tributyltin hydride. The effect of geometry of chlorine atom and olefin on products stereochemistry was also discussed.