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S. F. Fabio and C. O. Kappe, “The Biginelli Dihydropyrimidone Synthesis Using Polyphosphate Ester as a Mild and Efficient Cyclocondensation/Dehydration Reagent,” Arkivoc, Vol. 2001, No. 2, 2001, pp. 122-134.
http://dx.doi.org/10.3998/ark.5550190.0002.214

has been cited by the following article:

• TITLE: New Method for the Synthesis of 1-Methylimidazolium Trifluoroacetate and Its Application in Biginelli Reaction

  AUTHORS: Khan M. Hua, Thach N. Le

  KEYWORDS: Biginelli Reaction; Microwave Irradition; 1-Methylimidazolium Trifuoroacetate; Protic Ionic Liquid; Oxo-Monastrol; Ultrasonic Irradiation

  JOURNAL NAME: Green and Sustainable Chemistry, Vol.3 No.4A, November 22, 2013

  ABSTRACT: A new method for the synthesis of 1-methylimidazolium trifluoroacetate ([Hmi]Tfa), a protic ionic liquid (PIL), under ultrasonic irradiation has been developed. In addition, the product [Hmi]Tfa was successfully employed as solvent and catalyst in Biginelli reaction to prepare 3,4-dihydropyrimidinones (DHPMs) in high yield under mild reaction conditions.