This disclosure relates to a process for preparing 5-aminobenzofuran derivatives of general formula (I):
in which R
1
and R
2
are as defined in the description,
by treating a 5-N-alkylamidobenzofuran derivative of general formula (II):
in which R
1
, R
2
, and R
3
are as defined in the description, with a strong acid, so as to form an acid addition salt of the compound of formula (I), which salt is itself treated, if necessary, with a basic agent so as to form this compound of formula (I) in free base form.
[EN] NOVEL PROCESS FOR THE PREPARATION OF DRONEDARONE<br/>[FR] NOUVEAU PROCÉDÉ DE PRÉPARATION DE DRONÉDARONE
申请人:SANOFI SA
公开号:WO2012010913A1
公开(公告)日:2012-01-26
The subject of the invention is a novel process for the preparation of N-[2-n-butyl-3-4-[(3-di-n-butylamino)- propoxy]benzoyl}benzofuran-5-yl]-methanesulfonamide of formula (I), and pharmaceutically acceptable salts thereof characterized in that, the acyl group of the benzofuran derivative of the general formula (II), where R represents C 1-4 alkyl-, C1-4 alkoxy- or aryl group - is selectively cleaved and if desired, the resulting compound of formula I is transformed into its salt.