Palladium-Catalyzed Cyclization of Silyl-Substituted Bis(homo)propargylic Alcohols to 2,3-Dihydrofurans
作者:Silke Schabbert、Ernst Schaumann
DOI:10.1002/(sici)1099-0690(199809)1998:9<1873::aid-ejoc1873>3.0.co;2-7
日期:1998.9
Ring-opening of oxiranes 1 by the silicon- and sulfur-functionalized propargyl anions 2 yields the corresponding alk-4-yn-1-ols 3. Cyclization of 3 to 2,3-dihydro-4-phenylthiofurans 5 is achieved by reaction with palladium(II) acetate. The corresponding furans 7 are obtained when copper(II) chloride is added to the reaction mixtures.