Carbonyl-protected .beta.-lithio aldehydes and ketones via reductive lithiation. A general preparative method for remarkably versatile homoenolate equivalents
摘要:
A general procedure for producing homoenolate equivalents consists of reductive lithiation, induced by 4,4'-di-tert-butylbiphenylide, of carbonyl-protected beta-(phenylthio) carbonyl compounds prepared in turn by thiophenol addition to enones or the alkylation of silyl enol ethers by alpha-chlorothioethers.
One-Pot Synthesis of Keto Thioethers by Palladium/Gold-Catalyzed Click and Pinacol Reactions
摘要:
An atom-efficient synthesis of keto thioethers was devised via tandem gold/palladium catalysis. The reaction proceeds through a regioselective thiol attack at the beta-position of the alcohol, followed by an alkyl, aryl, or benzyl 1,2-shift. Both acyclic and cyclic systems were studied, in the latter case leading to the ring expansion of cyclic substrates.