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Several N-acyl-2-benzoylaziridines were prepared conveniently in good to high yields (71-93%) and used in the preparation of 5-benzoyloxazolines (76-91%) by a regio-and stereo-controlled reaction in the presence of NaI as an efficient catalyst under microwave irradiation in short reaction times (5-10 mins). The structure of the regioisomeric product was confirmed by X-ray analysis.

The one-pot domino Knoevenagel-type condensation/Michael reaction of aromatic, heteroaromatic and aliphatic aldehydes with 4-hydroxycoumarin in aqueous media in the presence of ruthenium salt as homogeneous catalyst was investigated. It was found that 5 mol% of RuCl3.nH2O catalyzes biscoumarin synthesis in high yields (70-95%) under optimised, mild, green and environmentally benign reaction conditions in short times (25-35min)

Fused polycyclic 4-aryl-3-methyl-4,7-dihydro-1H-pyrazolo[3,4-b]pyridines were obtained in a three-component regioselective reaction of 5-amino-3-methyl-1H-pyrazole, 2H-indene-1,3-dione and arylaldehydes in ethanol under ultrasound irradiation. This rapid method produced the products in short reaction times (4-5min) and excellent yields (88-97%).

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