A new reaction: A ruthenium-catalyzed transfer of an alkyl group from a trialkylamine to the α-carbon atom of a ketone leads in good yields to α-alkylated ketones [Eq. (1)]. The reaction is applicable to a wide range of alkyl(alkyl), alkyl(aryl), and cyclic ketones, and in the case of unsymmetrical ketones it takes place regioselectively at the less hindered α-position.
Maillard et al., Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1957, vol. 245, p. 185,187
作者:Maillard et al.
DOI:——
日期:——
Indanones and Indenols from 2-Alkylcinnamaldehydes via the Intramolecular Friedel−Crafts Reaction of Geminal Diacetates
作者:Gary B. Womack、John G. Angeles、Vincent E. Fanelli、Brinda Indradas、Roger L. Snowden、Philippe Sonnay
DOI:10.1021/jo900910b
日期:2009.8.7
When treated with Ac(2)O at rt in the presence of 4-6 mol% FeCl(3), 2-alkylcinnamaldehydes are converted to 2-alkyl-1H-inden-1-yl acetates through the intermediacy of gemdiacetates. Methanolysis of the indenyl acetates yields the corresponding indenols, Saponification yields 2-alkylindanones, providing, in effect, an intramolecular acylation employing catalytic levels of acid.