Synthesis of 3-substituted and 2,3-disubstituted 4-chlorofurans
Abstract
A simple method for the synthesis of 3-substituted and 2,3-disubstituted 4-chlorofurans is described which involves CuCl/bipy-catalysed regioselective cyclisation of 1-acetoxy-2,2,2-trichloroethyl allyl ethers followed successively by dechloroacetoxylation with Zn dust and tandem dehydrohalogenation–aromatisation with ButOK/18-crown-6.