Results 221 to 230 of about 28,644 (231)

A rhodium-catalyzed three-component reaction of arylisocyanides, trifluorodiazoethane, and activated methylene isocyanides or azomethine ylides: an efficient synthesis of trifluoroethyl-substituted imidazoles

Organic Chemistry Frontiers, 2019
A novel method for the synthesis of trifluoroethyl-substituted imidazoles is reported via a rhodium-catalyzed three-component reaction of isocyanides, 2,2,2-trifluorodiazoethane and activated methylene isocyanides or azomethine ylides.
Yang Yu, Yan Zhang, Zhuo Wang, Yong-Xin Liang, Yu‐Long Zhao   +4 more
semanticscholar   +1 more source

A Highly Enantioselective Copper/Phosphoramidite-Thioether-Catalyzed Diastereodivergent 1,3-Dipolar Cycloaddition of Azomethine Ylides and Nitroalkenes.

Chemistry, 2018
In contrast to the plethora of catalytic systems that enable access to any enantiomers of the chiral products by simply choosing between a pair of enantiomeric or pseudoenantiomeric chiral catalysts, few analogously effective protocols exist for the ...
B. Feng, Jia‐Rong Chen, Yun-Fang Yang, Bin Lu, W. Xiao   +4 more
semanticscholar   +1 more source

Diversity-oriented synthesis of chromenopyrrolidines from azomethine ylides and 2-hydroxybenzylidene indandiones via base-controlled regiodivergent (3+2) cycloaddition.

Chemical Communications, 2018
An organobase-directed, regiodivergent 1,3-dipolar cycloaddition of azomethine ylides and 2-hydoxybenzylidene indandiones is reported. The scarcely explored reversal of the nucleophilic site in azomethine ylides has been exploited for their ...
Jhen-Kuei Yu, Han-Wei Chien, Yi-Jung Lin, P. Karanam, Yu-Heng Chen, Wenwei Lin   +5 more
semanticscholar   +1 more source

Umpolung of o-Hydroxyaryl Azomethine Ylides: Entry to Functionalized γ-Aminobutyric Acid under Phosphine Catalysis.

Organic Letters, 2018
A phosphine-catalyzed reaction between o-hydroxyaryl azomethine ylides and MBH carbonates provides access to highly functionalized γ-aminobutyric acid derivatives in moderate to good yields.
Qingqing Chen, Yishu Bao, Xiuqin Yang, Zonghao Dai, Fulai Yang, Qingfa Zhou   +5 more
semanticscholar   +1 more source

A highly diastereoselective one-pot three-component 1,3-dipolar cycloaddition of cyclopropenes with azomethine ylides generated from 11H-indeno[1,2-b]-quinoxalin-11-ones

, 2018
A simple and efficient method has been developed for the synthesis of complex compounds with spiro-fused 11H-indeno[1,2-b]quinoxaline and cyclopropa[a]pyrrolizine or azabicyclo[3.1.0]hexane moieties. All the products have been synthesized in good to high
A. Filatov, N. Knyazev, Mikhail N. Ryazantsev, V. Suslonov, A. Larina, A. Molchanov, R. Kostikov, V. Boitsov, A. Stepakov   +8 more
semanticscholar   +1 more source

Metal Complex-Controlled Regio-, Diastero- and Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides with Benzo[b]thiophene Sulfones.

Chemistry, 2018
The Cu(MeCN)4 PF6 /DTBM-Segphos complex catalyzed the highly diastereo- and enantioselective 1,3-dipolar cycloaddition of azomethine ylides with benzo[b]thiophene sulfones with the usual regiochemistry to give single isomers of the exo-cycloadducts in ...
Masato Harada, Shuma Kato, Ryosuke Haraguchi, S. Fukuzawa   +3 more
semanticscholar   +1 more source

Regioselectivity of (3+2) cycloaddition of azomethine ylides to activated olefins in the synthesis of spiro[oxindole-3,2′-pyrrolidine] derivatives

Chemistry of Heterocyclic Compounds, 2020
A. N. Izmest’ev, G. Gazieva, A. Kravchenko   +2 more
semanticscholar   +1 more source

Unveiling the Reactivity of Cyclic Azomethine Ylides in [3+2] Cycloaddition Reactions within the Molecular Electron Density Theory

, 2020
L. Domingo, Karolina Kula, M. Ríos‐Gutiérrez   +2 more
semanticscholar   +1 more source

Synergistic Catalysis with Azomethine Ylides

Chinese journal of chemistry, 2020
Liang Wei, Chun‐Jiang Wang
semanticscholar   +1 more source

1,3-Dipolar cycloaddition reactions of azomethine ylides and alkynes

Chemistry of Heterocyclic Compounds, 2018
A. Gulevskaya, Julia I. Nelina-Nemtseva
semanticscholar   +1 more source