Diastereoselective Synthesis of 2,4-Disubstituted Tetrahydropyranols and Ethers via a Prins-Type Cyclization Catalyzed by Scandium Triflate
作者:Wen-Chun Zhang、Chao-Jun Li
DOI:10.1016/s0040-4020(00)00152-6
日期:2000.4
The reaction of aldehydes with homoallylic alcohols catalyzed by scandium triflate gives rise to the formation of 2-substituted tetrahydropyran-4-ols and ethers in good overall yields and with ‘all-cis’ configurations and high diastereoselectivities. The stereochemistries of these products were assigned with the assistance of coupling constants and NOE. Factors affecting the reaction have been examined