β-Nitroenamine having a formyl group behaves as the synthetic equivalent of unstable nitromalonaldehyde upon treatment with ketones under basic conditions and leads to 2,6-disubstituted 4-nitrophenols. The present method is safer than the conventional one using sodiumnitromalonaldehyde and enables the preparation of hitherto unknown nitrophenols.
A ring transformation of 1-substituted 3,5-dinitro-2-pyidones
作者:Eizo Matsumura、Masahiro Ariga、Yasuo Tohda
DOI:10.1016/s0040-4039(01)86159-1
日期:1979.1
Reaction of 1-substituted 3,5-dinitro-2-pyridones with sodium salts of β-keto esters gave the ring transformation products, phenol derivatives and -substituted nitroacetamides. Nonionic bicyclic intermediates could be isolated.
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