Abstract
A method for synthesis of pyrimido [4, 5-b] indole derivatives has been developed through the one-pot, three-component reaction of aldehyde, oxindole, urea (or) thiourea derivatives in the presence of catalytic amount of Keggin-type heteropoly acid, heteropoly-11-molybdo-1-vanadophosphoric acid, H4[PMo11VO40].32H2O supported on montmorillonite K10 clay for about 10% (PVMo-K10). Solvent-free heterogeneous reaction condition, simple workup procedure, short reaction time, moderately yield and reusability of the catalyst are the advantages of this protocol.
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