A short synthesis of dibenzofurans and dibenzothiophenes
作者:Michael Black、J. I. G. Cadogan、Hamish McNab
DOI:10.1039/c39900000395
日期:——
An efficient synthesis of dibenzofurans and dibenzothiophenes from aryl salicylates is described, which involves a novel rearrangement–extrusion–cyclisation sequence of o-substituted phenoxyl and thiophenoxyl radicals.
Formation of dibenzofurans by flash vacuum pyrolysis of aryl 2-(allyloxy)benzoates and related reactions
作者:Michael Black、J. I. G. Cadogan、Hamish McNab
DOI:10.1039/c002480e
日期:——
Flashvacuumpyrolysis (FVP) of aryl 2-(allyloxy)benzoates 5 and of the corresponding aryl 2-(allylthio)benzoates 6 at 650 °C, gives dibenzofurans 19 and dibenzothiophenes 20, respectively. The mechanism involves generation of phenoxyl (or thiophenoxyl) radicals by homolysis of the O-allyl (or S-allyl) bond, followed by ipso attack at the ester group, loss of CO2 and cyclisation of the resulting aryl