Syntheses of Some New Five–Membered Heterocycles Containing Selenium and Tellurium

The syntheses of some new chalcogenazole 1 and chalcogenophene 2, 3 derivatives under conventional Gewald’s conditions [1–4], by the action of ultrasound and focused microwave irradiation is reported. It was found that although ultrasound accelerated the described reaction significantly, the focused microwave irradiation manifested itself even more significantly.