Patent ID: 8431717

Claim:
A process for preparing 5-(2-ethyl-2,3-dihydro-1H-inden-2-yl)-1H imidazole hydrochloride of formula (V) comprising the steps of: a) condensing 1-trityl-1H-imidazole-4-carboxaldehyde with phtalide to form 2-(1-trityl-1H-imidazole-4-yl)indan-1,3-dione, b) alkylating the product of step (a) with ethyl iodide to form 2-ethyl-2-(1-trityl-1H-imidazole-4-yl)indan-1,3-dione, c) removing the trityl group from the product of step (b) by acid hydrolysis to form 2-ethyl-2-(1H-imidazol-4-yl)indan-1,3-dione, d) reducing the product of step (c) by catalytic hydrogenation to form the desired 5-(2-ethyl-2,3-dihydro-1H-inden-2-yl)-1H imidazole hydrochloride.