Asymmetric synthesis of pipecolic acid derivatives using the aza-Diels-Alder reaction
摘要:
Imines of the type R-N=CHCO2Et can be coerced into undergoing a (4 + 2) cycloaddition with substituted dienes if the reaction is carried out in DMF in the presence of both water and acid; these reactions show extremely high regio- and diastereoselectivity. Use of the 1-phenylethyl group as a chiral auxiliary leads to moderate asymmetric induction (typical d.e. ca. 70%); moreover, the diastereoisomers are surprisingly easy to separate, giving a short general route to optically pure substituted pipecolic acid derivatives.
PROCESS INTERMEDIATES AND METHODS FOR THE PREPARATION OF PROCESS INTERMEDIATES FOR THE SYNTHESIS OF ARGATROBAN MONOHYDRATE
申请人:Stivanello Mariano
公开号:US20140088310A1
公开(公告)日:2014-03-27
Methods are provided for the synthesis of key intermediates for the synthesis of Argatroban monohydrate, ethyl (2R,4R)-1-[(2S)-2-amino-5-[[imino(nitroamino)methyl]amino]-1-oxopentyl]-4-methylpiperidine-2-carboxylate compounded with HCl. Such intermediates are also provided.
[EN] METHOD FOR THE PREPARATION OF PROCESS INTERMEDIATES FOR THE SYNTHESIS OF ARGATROBAN MONOHYDRATE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'INTERMÉDIAIRES DE PROCÉDÉ POUR LA SYNTHÈSE DE L'ARGATROBAN MONOHYDRATE
申请人:LUNDBECK PHARMACEUTICALS ITALY S P A
公开号:WO2012136504A1
公开(公告)日:2012-10-11
Object of the present invention is a method for the synthesis of a key intermediate for the synthesis of Argatroban monohydrate, ethyl (2R,4R)-1-[(2S)-2-amino-5-[[imino(nitroamino)methyl]amino]-1-oxopentyl]-4- methylpiperidine-2-carboxylate compounded with HCl.
Intermediates for the synthesis of Argatroban monohydrate
申请人:Lundbeck Pharmaceuticals Italy S.p.A.
公开号:EP2752412A1
公开(公告)日:2014-07-09
The object of the present invention is a key intermediate for the synthesis of Argatroban monohydrate, ethyl (2R,4R)-1-[(2S)-2-amino-5-[[imino(nitroamino)methyl]amino]-1-oxopentyl]-4-methylpiperidine-2-carboxylate compounded with HCl.
Process intermediates and methods for the preparation of process intermediates for the synthesis of argatroban monohydrate
申请人:LUNDBECK PHARMACEUTICALS ITALY S.p.A.
公开号:US10385020B2
公开(公告)日:2019-08-20
Methods are provided for the synthesis of key intermediates for the synthesis of Argatroban monohydrate, ethyl (2R,4R)-1-[(2S)-2-amino-5-[[imino(nitroamino)methyl]amino]-1-oxopentyl]-4-methylpiperidine-2-carboxylate compounded with HCl. Such intermediates are also provided.