METHODS FOR PREPARATION OF 1,4-DIHYDROPYRIDINE-3,5-DICARBOXYLIC ACID DERIVATIVES IN THE FORM OF R ISOMERS AND THEIR SALTS, STARTING SUBSTANCES AND INTERMEDIATES FOR PREPARATION THEREOF
organic synthesis. SUBSTANCE: novel derivatives of 1,4-dihydropyridine-3,5-dicarboxylic acid described by general formula I: (I), wherein R1 and R3, identical of different, are C1-C8-alkyl optionally substituted by C1-C6-alkoxy or hydroxyl, and R2 is phenyl optionally substituted by halogen or cyano...
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Sprache: | eng |
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