Patent ID: 9434705
Filing Date: 2016-09-06
CPC Classification: A61K,A61P,C07D

Claim Text:
1. A method for preparing a compound of L-setastine hydrochloride, comprising the steps of, (a) providing a compound of formula II having a formula of: wherein the X is selected from a group consisting of Chlorine (Cl), Bromine (Br), Iodium (I), acyloxy, and sulfonyloxy; (b) providing a compound of formula III having a formula of: and (c) reacting said compound of formula II with said compound of formula III in absence of air or in presence of air and an environment of alkali-based compound, and in a solvent under a solvent reflux temperature for 4 to 6 hours to obtain said compound of L-setastine hydrochloride; wherein said solvent is toluene solution.