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A series of dihydrochromeno [4,3-b]pyrazolo[4,3-e]pyridines has been synthesized using a simple and efficient one-pot, three-component procedure. The products were obtained in good yields in the presence of heterogeneous nanoporous acid catalyst (SBA-Pr-SO 3 H).

A series of novel ninhydrin-derived spiro-quinazolinone derivatives in moderate to good yields have been synthesised through a ferric chloride catalysed reaction in 1,2-dichloroethane.

An intramolecular bromonium ion-assisted cyclization with sulfur as an internal nucleophile is described. Starting from benzoyl chlorides, this method provides an easy procedure for the synthesis of dihydrothiazole derivatives in moderate to good yields.

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