Visible-light-promoted oxidation/condensation of benzyl alcohols with dialkylacetamides to cinnamides
作者:Tianlong Yang、Maojian Lu、Zhaowei Lin、Mingqiang Huang、Shunyou Cai
DOI:10.1039/c8ob02938e
日期:——
Oxidative cross-coupling reactions of benzylalcohols with N,N-dialkylacetamides were developed only employing oxygen as the terminal oxidant, efficiently providing a new, novel protocol for the construction of multifunctionalized cinnamides with the synergistic effects of KOH, organic photocatalyst eosin Y, and visible light irradiation at room temperature. A broad substrate scope and mild reaction
The Heck Reaction of β-Arylacrylamides: An Approach to 4-Aryl-2-quinolones
作者:Sandro Cacchi、Giancarlo Fabrizi、Roberta Bernini、Ilse De Salve
DOI:10.1055/s-2006-951505
日期:2006.11
The Heck reaction of β-arylacrylamides with aryl iodides afforded the corresponding vinylic substitution products usually in high yields. The nature of β-substituents, aryl iodides and substituents at the nitrogen atom influences the stereochemical outcome. N,N-Dimethyl-β-arylacrylamides gave vinylic substitution products with higher stereoselectivity than the corresponding N-unsubstituted β-arylacrylamides. β-Arylacrylamides containing ortho-substituents led to the formation of only one stereoisomer. The procedure was used to prepare 4-aryl-2-quinolones from β-(o-bromophenyl)acrylamide through a sequential Heck reaction and copper-catalyzed cyclization process.
4-Aryl-2-quinolones through a Pseudo-Domino Heck/Buchwald–Hartwig Reaction in a Molten Tetrabutylammonium Acetate/ Tetrabutylammonium Bromide Mixture
作者:Gianfranco Battistuzzi、Roberta Bernini、Sandro Cacchi、Ilse De Salve、Giancarlo Fabrizi
DOI:10.1002/adsc.200600342
日期:2007.2.5
prepared from readily available o-bromocinnamamide and aryl iodides using phosphine-free palladium(II) acetate as the precatalyst and a molten tetra(n-butyl)ammonium acetate/tetra(n-butyl)ammonium bromidemixture as the reaction medium. The reaction proceeds through a pseudo-domino process involving two mechanistically independent, sequential catalytic cycles: a Heck reaction followed by an intramolecular
AbstractReactions of benzaldehydes with excess N,N-dimethylacetamide at 140 °C in the presence of diethyl carbonate as dehydrating agent and a base gave (E)-N,N-dimethylcinnamamides in good yields. If hydroxybenzaldehydes are used as substrates the reaction is accompanied by alkylation. Graphical abstract