[EN] A PROCESS FOR THE PREPARATION OF DROXIDOPA<br/>[FR] PROCÉDÉ DE PRÉPARATION DE LA DROXIDOPA
申请人:PIRAMAL ENTPR LTD
公开号:WO2016147132A1
公开(公告)日:2016-09-22
The present invention provides a novel process for the preparation of droxidopa, a synthetic amino acid precursor of norepinephrine. The process is a stereoselective process for the preparation of droxidopa using asymmetric induction and thus avoids synthetic process involving chiral resolution. The present invention also provides novel intermediates of formula V and formula VI.
[EN] METHOD FOR THE SYNTHESIS OF DROXIDOPA<br/>[FR] PROCÉDÉ DE SYNTHÈSE DE DROXIDOPA
申请人:CHELSEA THERAPEUTICS INC
公开号:WO2013142093A1
公开(公告)日:2013-09-26
The present application relates to a novel method of preparing L-threo-dihydroxyphenylserine (droxidopa). Specifically, the application is directed to a method of preparing droxidopa via a deprotection step that is an alternative to deprotection steps that have been previously disclosed. The new deprotection strategy is advantageous in that it avoids the need to use hydrogenolysis or hydrazine.
A novel process for the preparation of L-threo-dihydroxyphenylserine (Droxidopa) is described. It comprises of enantioselective hydrolysis of racemic (DL)-threo-N-acetyl-3-(3,4-methylenedioxyphenyl)-serine using commercially available L-amino acylase from
Aspergillus
sp. (EC 3.5.1.14) in the presence of cobalt ions, to obtain (L)-threo-3-(3,4-methylenedioxyphenyl)-serine followed by dealkylation to obtain Droxidopa. Protecting the amino group of (L)-threo-3-(3,4-methylenedioxyphenyl)-serine using either benzyloxycarbonyl or phthaloyl group before dealkylation followed by deprotection of the amino group results in obtaining Droxidopa in high yields and purity.