Enamines, prepared readily from various carbonyl compounds, react with acetals or trialkyl orthoformates in the presence of Lewis acids such as BF 3· OEt 2 to give corresponding β- alkoxy carbonyl compounds or α-dialkoxymethyl carbonyl compounds in good yields. The reaction of dienamines with acetals or trialkyl orthoformates also selectively gives corresponding β, γ-unsaturated α-(α-alkoxyalkyl) carbonyl compounds or β, γ-unsaturated ...
