Isoproterenone hydrochloride

The process often starts with catechol and chloroacetyl chloride. Isoproterenol hydrochloride (HCl) is produced by synthesizing an intermediate, typically 1-(3,4-bis(benzyloxy)phenyl)-2-(isopropylamino)ethanone hydrochloride, which is then subjected to debenzylation and catalytic hydrogenation to reduce the keto group to a hydroxyl function, forming the final active API.