New Synthetic Approach for the Construction of Multisubstituted 2-Acyl Furans by the IBX-Mediated Cascade Oxidation/Cyclization of<i>cis</i>-2-En-4-yn-1-ols (IBX=2-Iodoxybenzoic Acid)
作者:Xiangwei Du、Haoyi Chen、Yuanhong Liu
DOI:10.1002/chem.200801561
日期:2008.10.29
Highly Efficient Synthesis of Multisubstituted 2-Acyl Furans via PIFA/I2-Mediated Oxidative Cycloisomerization of cis-2-En-4-yn-1-ols
using a combination of hypervalent iodine(III) reagent, molecular iodine, and a base. This method offers an efficient synthesis of 2-acyl furans with diverse substitutionpatterns in a regioselective manner under mildreaction conditions. A mechanistic proposal for these transformations involving alkyne activation by trifluoroacetylhypoiodite generated in situ is presented.