Patent ID: 7235693

Claim:
A process for producing a compound corresponding to formula (I) in the form of its racemates, its pure stereoisomers, or in the form of mixtures of stereoisomers, in any mixing ratio; in the illustrated form or in the form of its salts, or in the form of its solvates; comprising the steps of: (a) suspending a compound corresponding to formula (II) in a solvent selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene and mixtures thereof, wherein said compound corresponding to formula (II) is present in the form of its racemates, its pure stereoisomers, its enantiomers or diastereomers, or in the form of mixtures of stereoisomers, in any mixing ratio; in the illustrated form or in the form of its salts, or in the form of its solvates; (b) adding thionyl chloride to the resultant suspension to form a reaction mixture and (c) separating the reaction product comprising the tertiary Cl group of formula (I) from the reaction mixture.