Process for the Dynamic Resolution of (Substituted) (R)- or (S)- Mandelic Acid
申请人:Bosson Bo Lars Gustaf
公开号:US20080293965A1
公开(公告)日:2008-11-27
The present invention relates to a process for the resolution of mandelic acid derivative enantiomers from (racemic) mixtures by salt formation (see, for example, formula IIa) with chiral base cyclic amides, and racemisation of the unresolved enantiomer in the same process, wherein an additional racemising base may optionally be used, employing an acid:total base (i.e. cyclic amide and optional additional base) molar ratio of at least 1:1; provided that the cyclic amide base is present in a molar ratio of at least 0.75; and to the use of the resolved mandelic acid derivatives as intermediates suitable for large-scale manufacturing of, for example, pharmaceutical compounds; wherein R is selected from CHF
2
, H, C
1-6
Alkyl, CH
2
F, CHCl
2
and CClF
2
; and wherein n is 0, 1 or 2; R
1
is H or C
1-6
Alkyl and X is H, halo or C
1-6
Alkyl.
Process
申请人:Blixt Hans Jorgen
公开号:US20080312457A1
公开(公告)日:2008-12-18
The present invention relates to a new process for the resolution of mandelic acid derivatives from racemic mandelic acid derivative mixtures by salt formation with chiral base cyclic amides; to the resolved mandelic acid cyclic amide salts (see, for example, formula IIa), as well as certain other metal and amine salts of the mandelic acid derivatives, and to the use of the resolved mandelic acid derivatives as intermediates suitable for large-scale manufacturing of, for example, pharmaceutical compounds; Formula IIa, wherein R is selected from CHF2, H, C1-6 Alkyl, CH2F, CHCl2 and CClF2; and wherein n is 0, 1 or 2; R1 is H or C1-6 Alkyl and X is H, halo or C1-6 Alkyl.
US7960582B2
申请人:——
公开号:US7960582B2
公开(公告)日:2011-06-14
[EN] A PROCESS FOR RESOLVING, OPTIONALLY SUBSTITUTED, MANDELIC ACIDS BY SALT FORMATION WITH A CHIRAL BASE CYCLIC AMIDE<br/>[FR] NOUVEAU PROCEDE