The survival of -butyldimethylsilyl group of silyl enol ethers in the reaction with dimethyl(methylene)ammonium iodide. Regioselective synthesis of -butyldimethylsilyl enol ethers containing an amino group

t-butyldimethylsilyl enol ethers containing an amino group were obtained in good yields (70–90%) by the reaction of t-butyldimethylsilyl enol ethers with dimethyl(methylene)ammonium iodide (the Eschenmoser salt).