Combined InCl3- and Amine-Catalyzed Intramolecular Addition of α-Disubstituted Aldehydes onto Unactivated Alkynes
摘要:
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.
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
Enantioselective Merger of Aminocatalysis with π-Lewis Acid Metal Catalysis: Asymmetric Preparation of Carbo- and Heterocycles
作者:Chandrasekaran Praveen、Benjamin Montaignac、Maxime R. Vitale、Virginie Ratovelomanana-Vidal、Véronique Michelet
DOI:10.1002/cctc.201300313
日期:2013.8
ratio. After a careful examination of several other strategies, the best synergic catalytic system, which combines a chiral copper(I) complex with cyclohexylamine, afforded the enantioselective preparations of cyclopentane, indane, and pyrrolidine scaffolds with moderate to excellent control of the all‐carbon quaternary stereogenic centers created through such cyclization processes.
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
the direct intramolecular addition of aldehydes to non-activated alkynes. Accordingly, the carbocyclizations of a range of formyl-alkynes afforded the corresponding cyclopentanes in good to excellent yields. Experimental evidence tends to support a synergistic enamine/π-activation reaction mechanism. The fruitful merger of iron catalysis to amine catalysis was successfully applied in the direct intramolecular
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.