Process for the preparation of unsymmetrical dihydropyridines
AssigneeBayer Aktiengesellschaft
InventorsPaul Naab, Willi Lange, Werner Teller
Life of this patent
Estimating the term…
Abstract
In the preparation of nitrenedipine by reaction of an ylidene compound of the formula ##STR1## with an enamine compound of the formula ##STR2## the improvement which comprises effecting the reaction in the presence of a catalytic amount of diisopropylamine acetate or dimethylbenzylamine acetate. The product is produced in high yield with reduced amounts of symmetrical by-products.
Claims4
In the preparation of nitrendipine by reaction of an ylidene compound of the formula ##STR6## with an enamine compound of the formula ##STR7## the improvement which comprises effecting the reaction in the presence of a catalytic amount of diisopropylamine acetate or dimethylbenzylamine acetate.
Dependencies are inferred from the claim text.