Monoacetals of α-Dicarbonyl Compounds from Enol Ethers

Abstract

The title compounds which are interesting synthetic intermediates are now available by several recent methods, for instance:

	Double α-sulfenylation of carbonyl compounds or their derivatives, followed by exchange of thioalkyl (or thioaryl) groups by alkoxy groups(1)
	Alkylation of lithium derivatives of the imine or hydrazone of pyruvic aldehyde dimethyl acetal(2)
	Reaction of acetals of α-keto-esters(3) or α-keto-amides(4) with organometallic reagents