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]thiophene analogues was achieved in good to excellent yields. By employing HBr (33 %) in acetic acid as a catalyst
一项关于苯和萘基不对称二醇与 HBr (33%) 在室温下在乙酸中的区域选择性环化的系统研究导致形成环化产物。通过使用这种方法,合成了多种蒽、并四苯和萘并[b]噻吩类似物,收率良好至极好。通过在乙酸中使用 HBr (33 %) 作为不对称二醇区域选择性环化的催化剂,非常容易并且避免了常见的二氢异苯并呋喃形成。