work as organocatalysts for Mitsunobureactions because they provide ethyl 2-arylazocarboxylates through aerobic oxidation with a catalytic amount of iron phthalocyanine. First, ethyl 2-(3,4-dichlorophenyl)hydrazinecarboxylate has been identified as a potent catalyst, and the reactivity of the catalyticMitsunobureaction was improved through strict optimization of the reaction conditions. Investigation
Conversion of α-Haloaldehydes into Acylating Agents by an Internal Redox Reaction Catalyzed by Nucleophilic Carbenes
作者:Nathan T. Reynolds、Javier Read de Alaniz、Tomislav Rovis
DOI:10.1021/ja046991o
日期:2004.8.1
herein that treatment of an alpha-haloaldehyde with a nucleophile in the presence of catalytic amounts of nucleophilic carbenes results in an internal redox reaction giving rise to a dehalogenated acylatingagent as an intermediate by a new reaction manifold. A brief illustration of the scope of this reaction is presented along with evidence supporting the direct intervention of the carbene in the acylation
Zincperchloratehexahydrate, Zn(ClO4)2⋅6H2O, efficientlycatalyses the esterification between nearly equimolar amounts of carboxylicacids and alcohols. The reaction works under solvent-free conditions at relatively low temperatures. Excellent results were obtained with a wide range of substrates.
Zur Acylierung von Hydroxy- und Mercapto-carbonsäureestern nach dem Carbodiimid/Acylierungskatalysator-Verfahren
作者:Nagaraj N. Rao、Hermann J. Roth
DOI:10.1002/ardp.19893220903
日期:——
Hydroxycarbonsäureester sind nachdemCarbodiimid/Acylierungskatalysator‐Verfahren leicht und in guten Ausbeuten zugänglich. Die Reaktion kann auch auf Dihydroxy‐ und Mercaptocarbonsäureester ausgedehnt werden. Die aus bestimmten Hydroxycarbonsäureestern erhaltenen Verbindungen sind Hitze‐unbeständig und zersetzen sich leicht unter Freisetzung der Carbonsäure. Bei Einsatz von Enantiomeren als Alkoholkomponente