An efficient one-pot synthesis of substituted quinolines from alpha-arylamino ketones in the presence of PBr3 in DMF has been developed. This general protocol provides a novel and facile access to substituted quinolines by sequential Vilsmeier-Haack reaction, intramolecular cyclization and aromatization reactions of alpha-arylamino ketones. PBr3 plays a dual role in the quinoline synthesis: as a key
Direct synthesis of 3-arylquinolines by a nano Pd-catalyzed regioselective C3-H arylation of quinolines
作者:Abhijit Paul、Aditya Paul、Somnath Yadav
DOI:10.1016/j.tetlet.2019.151364
日期:2020.1
3-Arylquinolines are biologically and medicinally very important compounds. Direct and regioselective C3-H arylation offers a straight forward methodology for their synthesis. In this work, we report their synthesis by a Pd nanoparticle catalyzed reaction with aryliodonium salts as the arylating agent in the presence of stoichiometric oxidant Cu(OAc)(2). The reaction works with different quinolines and diaryliodonium salts with both electron donating and electron withdrawing groups. The advantage of the methodology is that it does not require any ligand and the catalyst also is recoverable and recyclable. (C) 2019 Elsevier Ltd. All rights reserved.