Synthesis of Annulated Anthracenes, Carbazoles, and Thiophenes Involving Bradsher-Type Cyclodehydration or Cyclization-Reductive-Dehydration Reactions
作者:Settu Muhamad Rafiq、Ramakrishnan Sivasakthikumaran、Jayachandran Karunakaran、Arasambattu K. Mohanakrishnan
DOI:10.1002/ejoc.201500493
日期:2015.8
A conventional BF3·OEt2-mediated Bradsher-type cyclodehydration of 2-arylmethyl benzaldehydes in CH2Cl2 at room temperature gave polycyclic aromatic and heteroaromatic compounds. Alternatively, these compounds could be synthesized in better yields from 2-arylmethylbenzoic acids by triflic-acid-mediated cyclization followed by reductive dehydration.
在室温下,2-芳基甲基苯甲醛在 CH2Cl2 中的常规 BF3·OEt2 介导的 Bradsher 型环脱水得到多环芳香族和杂芳香族化合物。或者,这些化合物可以通过三氟甲磺酸介导的环化和还原脱水从 2-芳基甲基苯甲酸以更高的产率合成。