[EN] PROCESSES FOR PRODUCTION OF OPTICALLY ACTIVE COMPOUNDS<br/>[FR] PROCÉDÉS DE PRODUCTION DE COMPOSÉS OPTIQUEMENT ACTIFS
申请人:SUMITOMO CHEMICAL CO
公开号:WO2005121117A1
公开(公告)日:2005-12-22
A process for the production of optically active compounds (Ia) or (Ib) which comprises the first step of reacting a compound (II) with a compound (III) in the presence of a base to form a diastereomer mixture (I) and the second step of crystallizing an optically active compound (Ia) or (Ib) from the mixture (I) while making the mixture (I) undergo equilibrium epimerization in the presence of a base; and a process for the production of optically active compounds (IVa) or (IVb) by utilizing the above process.
PROCESS FOR THE PREPARATION OF 2-OXO-1-PYRROLIDINE DERIVATIVES
申请人:Surtees John
公开号:US20080009638A1
公开(公告)日:2008-01-10
The present invention relates to alternative processes for the preparation of 2-oxo-1-pyrrolidine derivatives of formula (I)
Particularly, the present invention relates to alternative processes for the synthesis of levetiracetam, brivaracetam and seletracetam.
Oxopyrrolidine compounds, preparation of said compounds and their use in the manufacturing of Levetiracetam and analogues
申请人:Ates Celal
公开号:US20060258734A1
公开(公告)日:2006-11-16
The present invention relates to an improved process for the preparation of (S)-(−)-α-ethyl-2-oxo-1-pyrrolidine acetamide and analogues thereof. The invention also relates to compounds of the general formula (6) wherein R
1
is methyl or ethyl; and R
2
is C?2#191 -C?4#191 alkyl, C?2#191-C?4#191 alkenyl or C?2#191-C?4#191 alkynyl, optionally substituted by one or more halogen, and their preparation processes.
Oxopyrrolidine compounds, preparations of said compounds and their use in the manufacturing of levetiracetam and analogues
申请人:——
公开号:US20040204476A1
公开(公告)日:2004-10-14
The present invention relates to an improved process for the preparation of (S)-(−)-&agr;-ethyl-2-oxo-1-pyrrolidine acetamide and analogues thereof. The invention also relates to compounds of the general formula (6) wherein R
1
is methyl or ethyl; and R
2
is C?2#19 1-C?4#191 alkyl, C?2#191 -C?4#191 alkenyl or C?2#191-C?4#191 alkynyl, optionally substituted by one or more halogen, and their preparation processes.
1
Oxopyrrolidine compounds, preparation of said compounds and their use in the manufacturing of levetiracetam and analogues
申请人:Ates Celal
公开号:US20070142647A1
公开(公告)日:2007-06-21
The present invention relates to an improved process for the preparation of (S)-(-)-α-ethyl-2-oxo-1-pyrrolidine acetamide and analogues thereof. The invention also relates to compounds of the general formula (6)
wherein R
1
is methyl or ethyl; and R
2
is C
2
-C
4
alkyl, C
2
-C
4
alkenyl or C
2
-C
4
alkynyl, optionally substituted by one or more halogen, and their preparation processes.