[EN] TRIAZOLIUM CARBENE CATALYSTS AND PROCESSES FOR ASYMMETRIC CARBON-CARBON BOND FORMATION [FR] CATALYSEURS À BASE DE CARBÈNE DE TRIAZOLIUM ET PROCÉDÉS POUR FORMER DES LIAISONS CARBONE-CARBONE ASYMÉTRIQUES
[EN] TRIAZOLIUM CARBENE CATALYSTS AND PROCESSES FOR ASYMMETRIC CARBON-CARBON BOND FORMATION [FR] CATALYSEURS À BASE DE CARBÈNE DE TRIAZOLIUM ET PROCÉDÉS POUR FORMER DES LIAISONS CARBONE-CARBONE ASYMÉTRIQUES
Asymmetric N-Heterocyclic Carbene Catalyzed Addition of Enals to Nitroalkenes: Controlling Stereochemistry via the Homoenolate Reactivity Pathway To Access δ-Lactams
作者:Nicholas A. White、Daniel A. DiRocco、Tomislav Rovis
DOI:10.1021/ja403847e
日期:2013.6.12
An asymmetric intermolecular reaction between enals and nitroalkenes to yield δ-nitroesters has been developed, catalyzed by a novel chiral N-heterocycliccarbene. Key to this work was the development of a catalyst that favors the δ-nitroester pathway over the established Stetter pathway. The reaction proceeds in high stereoselectivity and affords the previously unreported syn diastereomer. We also
Catalytic Asymmetric Intermolecular Stetter Reaction of Heterocyclic Aldehydes with Nitroalkenes: Backbone Fluorination Improves Selectivity
作者:Daniel A. DiRocco、Kevin M. Oberg、Derek M. Dalton、Tomislav Rovis
DOI:10.1021/ja904375q
日期:2009.8.12
The catalyticasymmetricintermolecularStetterreaction of heterocyclic aldehydes and nitroalkenes has been developed. We have identified a strong stereoelectronic effect on catalyst structure when a fluorine substituent is placed in the backbone. X-ray structure analysis provides evidence that hyperconjugative effects are responsible for a change in conformation in the azolium precatalyst. This new
TRIAZOLIUM CARBENE CATALYSTS AND PROCESSES FOR ASYMMETRIC CARBON-CARBON BOND FORMATION
申请人:Rovis Tomislav
公开号:US20130116445A1
公开(公告)日:2013-05-09
Provided herein are chiral triazolium catalysts useful for asymmetric C—C bond formation and processes for their preparation. Also provided are synthetic reactions in which these catalysts are used, in particular, in asymmetric C—C bond formation.