Keywords
ammonium acetate
multicomponent reactions
piperidin-2-ones
pyridinium salts
stereoselectivity.
ylides
Abstract
The Michael-Mannich-cyclization cascade of dicyano olefins, 1-(2-alkoxy-2-oxoethyl)pyridin-1-ium halogenides, aromatic aldehydes and ammonium acetate provides convenient stereoselective formation of (4,6-diaryl-5,5-dicyano-2-oxo-piperidin-3-yl)pyridin-1-ium halogenides with three stereogenic centres. Ammonium acetate plays dual role acting as a base and as a nitrogen source.
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