FIELD: chemical or physical processes.
SUBSTANCE: invention relates to a method for chiral extraction of ethyl-3-amino-1-[(3R,4S)-4-cyanotetrahydropyran-3-yl]pyrazole-4-carboxylate (VI) from a racemic mixture of ethyl-3-amino-1-[(3R,4S)-4-cyanotetrahydropyran-3-yl]pyrazole-4-carboxylate and ethyl-3-amino-1-[(3S,4R)-4-cyanotetrahydropyran-3-yl]pyrazole-4-carboxylate (V).
EFFECT: method enables efficient separation of enantiomers with both high efficiency and high selectivity.
17 cl, 3 tbl, 3 ex
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