菲尔:梅德兰,诺埃莉亚·索莱达。Consejo Nacional de Investigaciones Cientificas y Tecnicas。Centro Cientifico Tecnologico Conicet - 罗萨里奥。Instituto de Quimica Rosario。罗萨里奥国立大学。Facultad de Ciencias Bioquimicas y Farmaceuticas。Instituto de Quimica Rosario;阿根廷
A highly active diradical cobalt(<scp>iii</scp>) catalyst for the cycloisomerization of alkynoic acids
作者:Nicolas Leconte、Amaury du Moulinet d'Hardemare、Christian Philouze、Fabrice Thomas
DOI:10.1039/c8cc04459g
日期:——
The first cobalt-catalysed cycloisomerisation of alkynoicacids is reported, thanks to the design of a well-defined diradical cobalt(III) catalyst, in the absence of any additives. The high efficiency, regioselectivity and chemoselectivity are comparable to those of noble metal-based systems. The unique reactivity might be attributed to second coordination sphere effects.
Cycloisomerization of Acetylenic Acids to γ-Alkylidene Lactones using a Palladium(II) Catalyst Supported on Amino-Functionalized Siliceous Mesocellular Foam
作者:Anuja Nagendiran、Oscar Verho、Clémence Haller、Eric V. Johnston、Jan-E. Bäckvall
DOI:10.1021/jo4028006
日期:2014.2.7
Cycloisomerization of various γ-acetylenic acids to their corresponding γ-alkylidenelactones by the use of a heterogeneous Pd(II) catalystsupported on amino-functionalized siliceousmesocellularfoam is described. Substrates containing terminal as well as internal alkynes were cyclized in high to excellent yields within 2–24 h under mild reaction conditions. The protocol exhibited high regio- and
Introducing deep eutectic solvents as biorenewable media for Au(<scp>i</scp>)-catalysed cycloisomerisation of γ-alkynoic acids: an unprecedented catalytic system
作者:María J. Rodríguez-Álvarez、Cristian Vidal、Josefina Díez、Joaquín García-Álvarez
DOI:10.1039/c4cc05904b
日期:——
Cycloisomerisation reactions of γ-alkynoic acids can be conveniently performed in the eutectic mixture 1ChCl/2Urea at room temperature, under air and in the absence of co-catalysts by using a novel iminophosphorane–Au(i) complex.
Dispersed Gold Nanoparticles Supported in the Pores of Siliceous Mesocellular Foam: A Catalyst for Cycloisomerization of Alkynoic Acids to γ-Alkylidene Lactones
A versatile approach for the production of dispersed thiol-stabilized goldnanoparticles in the pores of siliceousmesocellularfoam (MCF) is described. The reported method is based on an electroch ...