Eine Methode zur C-Methylierung cyclischer β-Dicarbonyl-Verbindungen / A Method for the C-Methylation of Cyclic β-Dicarbonyl Compounds

Abstract

Abstract Cyclic β-dicarbonyl compounds (1,4,7,10) were reacted with either aniline or urea in the presence of trimethoxymethane to give the enamines 2, 5, 8 and 11, resp. The latter were reduced with hydrogen over palladium-charcoal or with the dimethylamine-boron-hydride complex to give the C-methylated β-dicarbonyl compounds 3,6,9 and 12, resp. in moderatly to good overall yields.