Abstract
An efficient and easy method has been developed for the preparation of some new aminonaphthoquinone derivatives from a one-pot three-component condensation of 2-hydroxy-1,4-naphthoquinone, ninhydrin and heteroaryl amines under catalyst and solvent-free conditions at 75 °C. The protocol describes in situ generated imine as intermediate from the condensation reaction of ninhydrin with heteroaryl amines followed by the addition of 2-hydroxynaphthalene-1,4-dione to the imine, afforded the desired products. The operational simplicity of the procedure, shorter reaction times, simple workup procedure, clean reaction, easy purification of products by nonchromatographic methods, environmentally friendly conditions and high yields make this method much attractive.
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