Copper-catalyzed oxidative dehydrogenative functionalization of alkanes to allylic esters
作者:Rakesh Mondal、Gargi Chakraborty、Kaj M. van Vliet、Nicolaas P. van Leest、Bas de Bruin、Nanda D. Paul
DOI:10.1016/j.ica.2019.119190
日期:2020.1
efficient and solvent-free method for the one-pot synthesis of allylic esters via dehydrogenation of unactivated alkanes and subsequent oxidative cross coupling with different substituted carboxylic acids. A simple, well defined and air stable Cu(II)-complex, [Cu(MeTAA)], featuring a tetraaza-macrocyclic ligand (tetramethyltetraaza[14]annulene (MeTAA)) is used as the catalyst. A wide variety of substituted
Iron-catalyzed esterification of allylic sp 3 C–H bonds with carboxylic acids: Facile access to allylic esters
作者:Bing Lu、Fan Zhu、Dan Wang、Hongmei Sun、Qi Shen
DOI:10.1016/j.tetlet.2017.05.039
日期:2017.6
iron-catalyzed esterification of allylic sp3 C–H bonds with carboxylic acids using ionic iron(III) complexes (1–4) as a catalyst and DTBP (DTBP = di-tert-butyl peroxide) as an oxidant is achieved. A variety of allylic esters were synthesized in good to excellent yields using the ionic iron(III) complex 2 as a catalyst in a 5 mol% loading. This reaction is characterized by its high efficiency, broad substrate
Allylic Oxidation of Alkenes Catalyzed by a Copper–Aluminum Mixed Oxide
作者:Ana Leticia García-Cabeza、Rubén Marín-Barrios、F. Javier Moreno-Dorado、María J. Ortega、Guillermo M. Massanet、Francisco M. Guerra
DOI:10.1021/ol500198c
日期:2014.3.21
strategy for the allylicoxidation of cyclic alkenes with a copper–aluminum mixedoxide as catalyst is presented. The reaction involves the treatment of an alkene with a carboxylic acid employing tert-butyl hydroperoxide as the oxidant. In all cases, the corresponding allylic esters are obtained. When l-proline is employed, the allylic alcohol or ketone is obtained. The oxidation of cyclohexene and
Ultrasound-promoted synthesis of a copper–iron-based catalyst for the microwave-assisted acyloxylation of 1,4-dioxane and cyclohexene
作者:Pablo Macías-Benítez、Alfonso Sierra-Padilla、M. Pilar Yeste、José María Palacios-Santander、Laura Cubillana-Aguilera、José M. Gatica、Hilario Vidal、Francisco M. Guerra、F. Javier Moreno-Dorado
DOI:10.1039/d2ob02117j
日期:——
A copper–iron-based catalyst has been prepared by a low-temperature co-precipitation and sonication method. The use of high-energy ultrasound reduces the time required for the preparation process from one workweek to one day with respect to the catalysts obtained by conventional coprecipitation and thermal treatment methods. The resulting material has been characterized at compositional, textural, structural
Dichloromethane as an Unusual Methylene Equivalent. A New Entry of Highly Nucleophilic and Selective Titanium−Methylene Complexes for Ester Methylenation
The successful application of CH2Cl2-Mg-TiCl4-system mediated methylenation of various esters such as tert-butyl ester and 2,5-cyclohexadiene-1-carboxylate highlights the extraordinary reactivity, selectivity, and the nonbasic nature of this new methylene-carbenoid, which serves as a practical reagent applicable to large-scale synthesis.