Untersuchungen an 1,3-Dicarbonyl-Verbindungen, 24. Mitt. 1,4-Dihydropyridine und 1,2,3,4-Tetrahydropyrimidine,III. Zur Reaktion von Acetylaceton mit 2-Nitrobenzaldehyd und Ammoniak

1,3-Dicarbonyl Compounds, XXIV: 1,4-Dihydropyridines and 1,2,3,4-Tetrahydropyrimidines, III; The Reaction of Acetylacetone with 2-Nitrobenzaldehyde and Ammonia Depending on the reaction conditions either the 1,4-dihydropyridine 1 or the 1,2,3,4-tetrahydropyrimidine 2 , with the indole 4 and the pyrimidine 5 as by-products, are obtained by Hantzsch synthesis. Compounds 1, 2 and 4 were characterized by chemical and spectroscopic methods. A mechanism leading to 4 is proposed.