<i>n</i>Bu<sub>4</sub>NI-Catalyzed α-Benzoxylation of Ketones with Terminal Aryl Alkenes
作者:Buddhadeb Mondal、Subas Chandra Sahoo、Subhas Chandra Pan
DOI:10.1002/ejoc.201500233
日期:2015.5
A metal-free protocol for the α-benzoxylation of ketones has been developed by using terminalarylalkenes as an arylcarboxy surrogate. Moderate to good yields were attained for a variety of propiophenones and acetophenones by using tetra-n-butylammonium iodide (TBAI) as the catalyst and tert-butyl hydroperoxide (TBHP) as the oxidant under ambient reaction conditions.
Abstract A convenient and facile synthesis of phenacyl esters is reported by the reaction of phenacyl bromide with potassium salts of aromatic acids in the presence of β‐cyclodextrin in water under neutral conditions. IICT Communication 050211.
Copper−Carbene Complexes as Catalysts in the Synthesis of Functionalized Styrenes and Aliphatic Alkenes
作者:Hélène Lebel、Michaël Davi、Silvia Díez-González、Steven P. Nolan
DOI:10.1021/jo061781a
日期:2007.1.1
2-propanol. The copper catalysts are not only inexpensive compared to rhodium complexes, but they also exhibit better functional group compatibility with aromatic aldehydes and ketones. Indeed very high yields were obtained for the formation of styrenes containing nitro, trifluoromethyl, amino, and ester groups, as well as for pyridine-, pyrrole-, and indole-substituted alkenes.
[reaction: see text] The rhodium(I)-catalyzed methylenation of ketones using trimethylsilyldiazomethane proceeds to give the corresponding alkenes in good yields (60-97%). The use of an excess of 2-propanol and 1,4-dioxane as a solvent were instrumental to obtain the desired alkenes in high yields. Superior results were achieved with the rhodium(I)-catalyzed methylenation in comparison with the standard
Efficient esterification of carboxylic acids with alkyl halides catalyzed by fluoride ions in ionic liquids
作者:L Brinchi、R Germani、G Savelli
DOI:10.1016/s0040-4039(03)01693-9
日期:2003.8
Ionic liquids based on 1,3-dialkylimidazolinium methanesulfonate have been used as efficient reusable reaction media in the esterification of several carboxylic acids with alkyl halidescatalyzed by fluoride ions. The method has wide applicability, and it is mild and green; it is useful for the protection of acids, via ester formation, for alkali labile molecules.