Efficient condensation of p -substituted phenols, p -thiocresol and 2,7-dihydroxynaphthalene with malonaldehyde tetramethyl acetal in trifluoroacetic acid
作者:Ahmad Banihashemi、Ali Rahmatpour
DOI:10.1016/s0040-4020(99)00353-1
日期:1999.6
Condensation reactions of malonaldehyde tetramethyl acetal with p-substituted phenol derivatives and p-thiocresol have been carried out in trifluoroacetic acid and the corresponding methano-dibenzo[1,3]-dioxocins and dithiocin type compounds were obtained in good to excellent yields. In the case of condensation of 2,7-dihydroxynaphthalene with malonaldehyde tetramethyl acetal 8,16-methano-16H-dinaphtho[2
Regioselective synthesis of di-aromatic ring-fused 2,8-dioxa/dithia bicyclo[3,3,1]nonane derivatives via recyclable polymeric Brønsted acid-catalyzed one-pot tandem formation of multiple chemical C–C/C–O and C–C/C–S bonds
diverse symmetrical substituted di-aromatic-fused 2,8-dioxa/dithiabicyclo[3,3,1]nonane derivatives containing methylene-bridged bicyclic framework via reusable cross-linked polystyrene-supported p-toluenesulfonic acid-catalyzed tandem reactions of substituted phenols/selected thiophenol with 1,1,3,3-tetramethoxypropane under neat conditions has been reported in which four new chemical bonds (two C–C/two C–O)-(two