Thiophenol-catalyzed Claisen rearrangement and radical cyclization: formation of furo- and pyrano-coumarin derivatives
作者:K.C. Majumdar、P. Debnath、P.K. Maji
DOI:10.1016/j.tetlet.2007.05.133
日期:2007.7
synthesis of dihydrofurocoumarins and dihydropyranocoumarins in excellent yields from 4-prop-2-ynyloxy coumarin via a thiol mediated radical reaction is described. Alkenyl radicals are generated from easily available terminal alkynes and thiophenol. Thiophenol catalyzed the Claisenrearrangement of the 4-prop-2-ynyloxycoumarin ethers.