Facile Synthesis of Multisubstituted Benzo[<i>b</i>]furans via 2,3-Disubstituted 6,7-Furanobenzynes Generated from <i>ortho</i>-Iodoaryl Triflate-type Precursors
a highly regioselective manner. Since a variety of precursors were easily synthesizable from readily available 2,3-disubstituted 6-hydroxybenzofurans, this method enabled facile synthesis of a wide range of multisubstituted benzofurans, including π-extended molecules.
Condensations of benzil with phenols and aryl ethers mediated by tin(IV) chloride pentahydrate
作者:Brian J Morrison、Oliver C Musgrave
DOI:10.1016/s0040-4020(02)00357-5
日期:2002.5
The reaction of benzil with phenol at 180°C in the presence of SnCl4·5H2O produces a benzofuran, a benzofuranol, a benzodifuran, and a benzofuranone. Anhydrous tin(IV) chloride also gives a benzofuranofuranone. Other phenols and their methyl ethers yield related products. The good yields of the benzo- and naphtho-furanones make the method an attractive alternative to the benzilic acid route to such
Abstract A convenient, generalprocedure for formylation of diverse range of phenols with the Duff protocol has been developed. The procedure gives dialdehydes when possible. A convenient, generalprocedure for formylation of diverse range of phenols with the Duff protocol has been developed. The procedure gives dialdehydes when possible.
.alpha.-Heterosubstituted phosphonate carbanions. 11. Benzoins via an acyl anion equivalent. Novel one-pot preparation of benzo[b]furans via benzoins using hydriodic acid