Synthesis of 4-Difluoromethylquinolines by NHC-Catalyzed Umpolung of Imines
摘要:
The N-heterocyclic carbene (NHC)-catalyzed umpolung of aldimines for the synthesis of 4-difluoromethyl-quinoline derivatives is reported. In the presence of NHCs, the intramolecular cyclization of aldimines bearing a moderately electron-poor double bond due to the presence of the -CF3 group likely proceeds via the intermediacy of the aza-Breslow intermediate. The key to the success of this aza-Stetter type transformation is the NHC generated from the bicyclic triazolium salt using DBU as the base.
4-Difluoromethylated Quinoline Synthesis via Intramolecular S<sub>N</sub>2′ Reaction of α-Trifluoromethylstyrenes Bearing Imine Moieties
作者:Takashi Mori、Junji Ichikawa
DOI:10.1246/cl.2004.1206
日期:2004.9
Intramolecular cyclization of o-methyleneamino-substituted α-trifluoromethylstyrenes is promoted by DBU and a catalytic amount of KCN to provide 4-(difluoromethyl)quinolines. The reaction proceeds ...
Unlocking the direct photocatalytic difluoromethylation of CN bonds
作者:Alberto F. Garrido-Castro、Andrea Gini、M. Carmen Maestro、José Alemán
DOI:10.1039/d0cc01353f
日期:——
current study presents a direct CF2H radical addition to C[doublebond, length as m-dash]Nbonds predicated on the photocatalytic activation of commercially available zinc difluoromethanesulfinate. The mild conditions in place lead to impressive structural diversity, as quinoxalinones and dibenzazepines, among others, are successfully functionalized.
Synthesis of 4-Difluoromethylquinolines by NHC-Catalyzed Umpolung of Imines
作者:Atanu Patra、Fabien Gelat、Xavier Pannecoucke、Thomas Poisson、Tatiana Besset、Akkattu T. Biju
DOI:10.1021/acs.orglett.7b04055
日期:2018.2.16
The N-heterocyclic carbene (NHC)-catalyzed umpolung of aldimines for the synthesis of 4-difluoromethyl-quinoline derivatives is reported. In the presence of NHCs, the intramolecular cyclization of aldimines bearing a moderately electron-poor double bond due to the presence of the -CF3 group likely proceeds via the intermediacy of the aza-Breslow intermediate. The key to the success of this aza-Stetter type transformation is the NHC generated from the bicyclic triazolium salt using DBU as the base.