Abstract
A facile and efficient procedure is developed for H3PW12O40 catalyzed new and one-pot synthesis of highly functionalized oxazoles linked to benzo[a]phenazin derivatives using phenylenediamine derivatives, 2-hydroxy-1,4-naphthoquinone, arylglyoxals and acetonitrile via a multicomponent tandem cyclization Robinson-Gabriel reaction in a very short time and easy workup without any byproduct. Acetonitrile served not only as a solvent but also as the substrate in the reaction.
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