Sustainable approach to tandem catalysis: Expedient access to quinoxalines and pyrido [2, 3-b] pyrazines from α-hydroxyketones via microwave-induced [(NH 4) 6 Mo …

K Aghapoor, F Mohsenzadeh, MM Morad…

Index: Aghapoor, Kioumars; Mohsenzadeh, Farshid; Mohebi Morad, Mina; Darabi, Hossein Reza Comptes Rendus Chimie, 2012 , vol. 15, # 9 p. 764 - 767

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Abstract

[(NH4) 6Mo7O24· 4H2O–PEG 300] is introduced as a polar paste catalyst system for tandem synthesis of quinoxalines and pyrido [2, 3-b] pyrazines under open-vessel focused microwave irradiation. Low conversions were obtained when catalyst or PEG was used individually. Accordingly, a convenient combination of catalyst and PEG mostly led to quantitative yield of products within 15min microwave irradiation with good turnover ...