aza-Annulation of β-aminovinyl trifluoromethyl ketones with acryloyl chloride: an efficient synthesis of 5-(trifluoroacetyl)-3,4-dihydro-2(1H)-pyridinones

The first example of aza-annulation of β-aminovinyl trifluoromethyl ketones with acryloyl chloride has been studied. 5-Trifluoroacetyl-containing 3,4-dihydro-2(1H)-pyridinones 3a–j were obtained from β-substituted enaminones 2a–j, whereas β-unsubstituted enaminone 4 gave a mixture of cyclic and acyclic products.