Process for preparation of enantiomerically pure polysubstituted 1,4-dihydropyridines
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United States of America Patent
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Sep 14, 1993
Grant Date -
N/A
app pub date -
Aug 14, 1991
filing date -
Feb 17, 1989
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Expired
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Abstract
A process for the optical resolution of racemic 1,4-dihydropyridines, containing isothioureido groups. Salification of racemic isothioureas with optically active acids produces diasteroisomeric mixtures of isothiouronium salts, that, using conventional techniques, are separated in the individual components to give optically pure isothioureides of 1,4-dihydropyridines and salts thereof with conventional acids. Said optically pure 1,4-dihydropyridines can then be subjected to desulphuration and to different transformations to give to other enantiomerically pure and therapeutically useful 1,4-dihydropyridines.
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