Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1992-10-01
1993-10-05
Lee, Mary C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C07D20704, C07D20722
Patent
active
052507050
ABSTRACT:
The present invention relates to process for the isolation of (-)-(S)-3-methylamino-4-methylenepyrrolidine derivatives of the formula: ##STR1## wherein R is hydrogen or amino-protecting group, from the racemic mixture of them comprising the salt formation of the racemate with L-(+)-tartaric acid in a molar ratio of 2:1 and subsequent treatment with a base, and optionally followed by deprotection of the amino-protecting group.
By this process, complicated procedure in resolutional crystallization is not necessary and (-)-(S)-3-methylamino-4-methylenepyrrolidine derivatives can be obtained as optically pure form in above 90% yield quantitatively by single procedure.
REFERENCES:
patent: 5017581 (1991-03-01), Nishitani et al.
Okada Tetsuo
Tsushima Tadahiko
Lee Mary C.
McKane Joseph K.
Shionogi & Co. Ltd.
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