Cooperative Copper(I) and Primary Amine Catalyzed Room-Temperature Carbocyclization of Formyl Alkynes
作者:Benjamin Montaignac、Maxime R. Vitale、Virginie Ratovelomanana-Vidal、Véronique Michelet
DOI:10.1002/ejoc.201100464
日期:2011.7
An efficient CuI/amine catalytic system is described for the carbocyclization of α-disubstituted formylalkynes at room temperature. Merging aminocatalysis to the copper(I)-catalyzed activation of alkynes led to clean carbocyclization of a wide range of functionalized substrates under mild conditions. This novel cooperative catalytic system allowed the formation of a variety of carbo- and heterocycles
Combined InCl<sub>3</sub>- and Amine-Catalyzed Intramolecular Addition of α-Disubstituted Aldehydes onto Unactivated Alkynes
作者:Benjamin Montaignac、Maxime R. Vitale、Veronique Michelet、Virginie Ratovelomanana-Vidal
DOI:10.1021/ol100729t
日期:2010.6.4
The combination of enamine-type catalysis to the indium-catalyzed activation of alkynes allows the efficient preparation of functionalized cyclopentanes bearing a quaternary stereogenic center. A broad range of formylalkynyl derivatives has been prepared. The InCl3/(Cy)(i-Pr)NH system efficiently promotes the carbocyclization reaction of alpha-disubstituted aldehydes in good to excellent yields.
Direct Carbocyclization of Aldehydes with Alkynes: Combining Gold Catalysis with Aminocatalysis
作者:Jörg T. Binder、Benedikt Crone、Timm T. Haug、Helge Menz、Stefan F. Kirsch
DOI:10.1021/ol800092p
日期:2008.3.1
A combination of gold(l) complexes and amine bases catalyzes the 5-exo-dig cyclization of formyl alkynes. This direct alpha-functionalization of aldehydes with unactivated alkynes does not involve the use of preformed enol equivalents.
Copper(i)–amine metallo-organocatalyzed synthesis of carbo- and heterocyclic systems
作者:Benjamin Montaignac、Victor Östlund、Maxime R. Vitale、Virgnie Ratovelomanana-Vidal、Véronique Michelet
DOI:10.1039/c2ob06449a
日期:——
and atom economical synthesis of 5-membered cyclic structures has been achieved through the combination of amino catalysis and metal catalysis. The discovery of a novel metallo-organocatalytic system merging the use of a catalytic copper(I) complex and a catalytic amount of cyclohexylamine allowed the room temperature preparation of a broad range of skeletons such as cyclopentanes, indanes, pyrrolidines