Abstract
Condensations of anhydrides and quinaldine derivatives are accelerated by microwave irradiation under solvent free conditions in the presence of silica gel as catalyst.
Highlights
Quinophthalones have achieved great significance in organic synthesis [1-4]
The application of microware irradiation has gained popularity in organic synthesis [20-25], in chemical reactions with reagents impregnated on solid mineral supports, especially those that are efficient in dry media, due to their selectivity, high reaction rates, cleaner formation of products and operational simplicity
We report a simple synthetic procedure for the preparation of quinophthalone pigments under microwave irradiation catalyzed by silica gel (Scheme 1)
Summary
Quinophthalones have achieved great significance in organic synthesis [1-4]. Many studies have shown these compounds to be rich sources of innovative chemistry as a number of pharmaceutical products and dyestuffs contain this ring system [5-11]. Abstract: Condensations of anhydrides and quinaldine derivatives are accelerated by microwave irradiation under solvent free conditions in the presence of silica gel as catalyst. Several methods for the preparation of quinophthalones have been reported such as treatment of phthalic anhydrides and a mixture of quinaldine with nitrobenzene [13], ZnCl2 [14-17] or sodium hydride [18] and reactions of quinoline N-oxides/β-diketones [19].
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