Regioselective Annulation of Unsymmetrical 1,2-Phenylenebis(diaryl/diheteroarylmethanol): A Facile Synthesis of Anthracene, Tetracene, and Naphtho[<i>b</i>]thiophene Analogues
作者:Ramakrishnan Sivasakthikumaran、Settu Muhammad Rafiq、Elumalai Sankar、J. Arul Clement、Arasambattu K. Mohanakrishnan
DOI:10.1002/ejoc.201501087
日期:2015.12
A systematic study on the regioselective cyclization of benzene- and naphthalene-based unsymmetrical diols with HBr (33 %) in acetic acid at room temperature led to the formation of annulation products. By using this method, synthesis of a wide variety of anthracene, tetracene and naphtho[b]thiopheneanalogues was achieved in good to excellent yields. By employing HBr (33 %) in acetic acid as a catalyst
Improved Synthesis of Aryl-Substituted Anthracenes and Heteroacenes
作者:Guijie Li、Shaolin Zhou、Guowei Su、Yuanhong Liu、Peng George Wang
DOI:10.1021/jo7017334
日期:2007.12.1
[Graphics]A Bronsted acid-catalyzed highly efficient construction,of substituted arylanthracenes and heteroacenes is described, which is assumed to be initiated through the facile formation of a benzylic cation intermediate. This method offers several advantages in comparison with known aromatic cyclodehydration reactions such as high selectivities, mild reaction conditions, and easily accessible starting materials.