The preparation of synthetically useful carbonyl-protected δ- and ε-lithio ketones via reductive lithiation
作者:Shirong Zhu、Theodore Cohen
DOI:10.1016/s0040-4020(97)10230-7
日期:1997.12
and ε-lithioketone equivalents. Primary and tertiary organolithiums have been generated and the ketone function may be part of a ring. The major synthetic use demonstrated in this report is the conversion to mixed heterocuprates which react with acyl chlorides to yield mono-protected 1,6- or 1,7-diketones. The cuprates also undergo conjugateaddition to enones.
Preparation of Aliphatic Ketones through a Ruthenium-Catalyzed Tandem Cross-Metathesis/Allylic Alcohol Isomerization
作者:David Finnegan、Benjamin A. Seigal、Marc L. Snapper
DOI:10.1021/ol060918g
日期:2006.6.1
shown to be effective catalysts for cross-metatheses of allylic alcohols with cyclic and acyclic olefins, as well as isomerization of the resulting allylic alcohols to alkyl ketones. The net result of this new tandem methodology is a single-flask process that provides highly functionalized, ketone-containing products from simple allylic alcohol precursors. [reaction: see text]
α-Substituted cyclopentanones or cyclohexanones with a carbonyl function at the 4- or 5-position of the side chain were converted to bicycloenones under acetalization conditions (BF3/ethylene glycol).