Patent ID: 7759527

Claim:
A microwave induced one pot process for the preparation of arylethenes of general formula (I), wherein R 1 to R 5 are defined as, at least one OH or acetoxy substituent among R 1 , R 3 , R 5 and rest of substituents R 1 to R 5 , being H or OH or OCH 3 or CH 3 COO— or halogen or nitro or combinations thereof, R′═H in case of styrenes and substituted aryl group in case of stilbenes, the said process comprising steps of: a) reacting 2- or 4-hydroxy substituted cinnamic acid or its derivative in the presence of a combination of organic and inorganic bases, a solid support, and a solvent under microwave irradiation for 1 min-12 hrs, wherein the organic base is imidazole or methyimidazole, and the inorganic base is selected from a group consisting of sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium bicarbonate, sodium carbonate, potassium bicarbonate, and potassium carbonate; b) transferring the reaction mixture of step (a) and washing a residue with an organic solvent, c) washing the organic solution of step (b) with aqueous sodium bicarbonate or sodium carbonate followed by brine and water, d) drying the organic layer of step (c) over anhydrous sodium sulphate, filtering and evaporating to dryness to obtain another residue, e) purifying the residue of step (d) by column chromatography or recrystallization to obtain the corresponding arylethenes of general formula (I).