Nucleophilic Reaction upon Electron-deficient Pyridone Derivatives. IV. Ring Transformation of 1-Substituted 3,5-Dinitro-2-pyridones with Ketones in the Presence of Amines
作者:Eizo Matsumura、Yasuo Tohda、Masahiro Ariga
DOI:10.1246/bcsj.55.2174
日期:1982.7
Ring transformation of 1-substituted 3,5-dinitro-2-pyridones with 1,3-disubstituted acetones in the presence of secondary or primary amines gave p-nitroaniline derivatives and N-substituted 2-nitroacetamide. Two types of enamine intermediates, 2-azabicyclo[3.3.1]nonene derivatives and N-substituted 2-(5-amino-2-nitro-2,4-cyclo-hexadienyl)-2-nitroacetamides were isolated and characterized. The course
Fragmentation of 3,5-dinitro-2-pyridone (1) by primary amine gave nitroacetamide (2) and nitromalonaldehyde diimine. In the case of N-methyl derivative (1c), the reaction was completely suppressed by the product 2 to give an anionic σ-adduct of 1c with 2. The mechanism of the reaction was discussed.