A facile synthesis of new coumarin-3,4-dihydropyrimidin-2(1H)-ones/thiones dyads
摘要:
A new series of 4-aryl-6-methyl-5-(2-oxo-2H-chromene-3-carbonyl)-3,4-dihydropyrimidin-2(1H)-ones/thiones (DHPMs) have been synthesized through multicomponent Biginelli reactions, involving 3-(acetoacetyl)coumarin derivatives, para-substituted benzaldehydes, and urea/thiourea in refluxing acetonitrile, in the presence of a catalytic amount of sulfuric acid. The structure of all newly synthesized compounds has been established by 2D NMR spectroscopic spectra (HSQC, HMBC, and NOESY), elemental analysis, and mass spectrometry. (C) 2015 Elsevier Ltd. All rights reserved.
Envirocat EPZ-10: An efficient catalyst for the synthesis of 3-acetoacetylcoumarins
作者:T.S. Shaikh、K.A. Undale、D.S. Gaikwad、D.M. Pore
DOI:10.1016/j.crci.2011.08.002
日期:2011.11
A simple, efficient and ecofriendly procedure has been developed for the synthesis of 3-acetoacetylcoumarins from salicylaldehyde(s) and 4-hydroxy-6-methyl-2H-pyran-2-one using EPZ-10 as a catalyst in ethanol medium at reflux condition. The present methodology offers several advantages such as excellent yields, short reaction time and use of EPZ-10 as an eco-friendly catalyst. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.