Lithiated ambident anions derivedfrom (1-alkyl-2-propenyl)- or (1-phenyl-2-propenyl)-pentamethyl phosphoric triamides undergo regioselectively γ-reaction with various alkylating reagents and isobutyraldehyde. Further hydrolysis of adducts releases the ketone under acid conditions. Number of synthetic applications clearly show the ketone homoenolate behaviour of these new carbanions.
Control of chemo- and stereoselectivity in the reactions of organocuprates with .alpha.-oxoketene dithioacetals
作者:R. Karl Dieter、Louis A. Silks、Jeffrey A. Fishpaugh、M. E. Kastner
DOI:10.1021/ja00302a014
日期:1985.8
Les α-oxocetene dithioacetals subissent une substitution selective par les reactifs organo-Cu-Li pour conduire a des β-alkylthio α-β-enones. On examine les effets de la structure, du coordinat de Cu transferable, du reactif Cu et du solvant sur la chimio- et la stereoselectivite de la reaction
Les α-oxocetene dithioacetals 存在未取代选择性的反应性有机-Cu-Li 倾倒导致 des β-烷硫基 α-β-烯酮。在检查les effets de la structure, du coordinat de Cu transferable, du reactif Cu et du solvant sur la chimio- et la立体选择性德拉反应
Synthesis of .alpha.-pyrones from vinylogous thiol esters and .alpha.-oxo ketene dithioacetals
作者:R. Karl Dieter、Jeffrey R. Fishpaugh
DOI:10.1021/jo00244a035
日期:1988.4
A stereoselective synthesis of .alpha.,.beta.-unsaturated ketones involving the reactions of organocuprates with .beta.-alkylthio .alpha.,.beta.-enones