The present invention refers to an improved process of producing Amorolfine base, which is a compound of formula (I):
said process comprising the steps of:
(i) contacting a compound of formula (II):
with a Friedel-Crafts catalyst; and
(ii) adding one equivalent of 2-halogeno-2-methylbutane,
characterised in that the reaction mixture obtained in step (i) is cooled to a temperature between -40 to -60 °C prior to step (ii) and the Friedel-Craft catalyst is chosen among the group consisting of boron trifluoride complex, titanium chloride complex, zinc chloride, gallium chloride, antimony pentafluoride, molybdenum pentachloride, indium chloride, antimony pentachloride, lanthanide bromide, scandium(III)triflate, lanthanide (III) triflate, yterbium (III) triflate and silica gel associated with ferric chloride.
PROCESS FOR THE PURIFICATION OF AMOROLFINE HYDROCHLORIDE
申请人:Angeli Roberto
公开号:US20110301346A1
公开(公告)日:2011-12-08
The present invention relates to a process for the purification of amorolfine hydrochloride by means of a reversed-phase preparative high performances liquid chromatography (prep-HPLC) said method starting from a crude Amorolfine hydrochloride having purity higher than 90% and containing Bepromoline hydrochloride <5% and Fenpropimorf <3%. The process involves the use of a mobile phase comprising water and an organic solvent under isocratic conditions.