A novel route to δ,ε-unsaturated-α-ketocarboxylic acid esters via ring opening of 6-trimethylsilylmethyl-5,6-dihydro-4H-1,2-oxazines
Abstract
6-Trimethylsilylmethyl-5,6-dihydro-4H-1,2-oxazines, which are prepared by the reaction of α-halogeno-oximes with allylsilanes in the presence of anhydrous sodium carbonate, are converted into δ,ε-unsaturated-α-ketocarboxylic acid esters by the action of mineral acids.