Synthesis of polysubstituted pyridines under combined microwave and ultrasound irradiation: K2CO3-promoted tandem addition/cyclization/hydrogen shift process
摘要:
A convenient and efficient K2CO3-promoted tandem reaction of chalcone, malononitrile, and methanol for the synthesis of highly functionalized pyridines has been developed. This multi-component reaction employing the weak nucleophilic agent methanol proceeded smoothly under combined microwave and ultrasound irradiation (CMUI). The reaction mechanism was proposed to consist of a Michael addition. a methoxylation of C N bond, a cyclization to a 1,4-dihydropyridine and an intermolecular hydrogen shift between 1,4-dihydropyridine and initial chalcone. (C) 2011 Elsevier Ltd. All rights reserved.
Microwave-Assisted, One-Pot Multicomponent Synthesis of Some New Cyanopyridines
作者:Amer A. Amer、Antar A. Abdelhamid
DOI:10.1002/jhet.2926
日期:2017.11
An efficient and facile synthesis of cyanopyridines via a one‐pot four‐component reaction of aromatic aldehydes, acetophenones, malononitrile, or 2‐aminoprop‐1‐ene‐1,1,3‐tricarbonitrile in presence of sodium alkoxide or ammonium acetate under both microwave and thermal reaction conditions was introduced.