Application of microwave heating of dry organic reactions : new condensation products from triacetic acid lactone (TAL)

Abstract

The work undertaken resides in the development of new methods of synthesis respectful of the environment. A convenient synthesis of bis(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl) arylmethanes are obtained by condensation of triacetic acid lactone (4-hydroxy-6methyl-2H-pyran-2-one)

with aromatic aldehydes, in absence of the catalyst, without solvent by activation under microwave irradiation. This method has environmentally friendly advantages, short reaction time, high yields and easy preparation. We report here the synthesis of new heterocyclic compounds (dilactones) from TAL providing evidence for the particular reactivity of the position 3 of these compounds