Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1994-06-10
1995-03-21
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
562401, 562490, 562494, 5483441, C07D23364, C07B 5500, C07C 51487
Patent
active
053997077
ABSTRACT:
A process is provided whereby S(+)-ibuprofen or R(-)-ibuprofen L-lysinate salt is produced by selective precipitation from a mixture containing enantiomers of ibuprofen and L-lysine. The quantity of L-lysine is not more than about a molar equivalent of the quantity of one of the enantiomers in the ibuprofen enantiomeric mixture. Upon precipitation of one ibuprofen enantiomer from the mixture, the overall precipitate and reaction mixture can be held for a sufficient period of time at a second temperature to allow the first precipitate to redissolve into the reaction mixture and the other ibuprofen enantiomer to precipitate out of the mixture in the salt form. Optically active ibuprofen is racemized by being heated at 100.degree. C. to 300.degree. C. in the substantial absence of other materials.
REFERENCES:
patent: 4994604 (1991-02-01), Tun et al.
patent: 5015764 (1991-05-01), Mauimaran et al.
patent: 5189208 (1993-02-01), Stahly
Bhattacharya Apurba
Fritch John R.
McAdams Carina A.
Murphy Carl D.
Zeagler Larry D.
Cassady Donald R.
Dees Jos,e G.
Hoechst Celanese Corporation
Jones Dwayne C.
Mullen James J.
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