Results 191 to 200 of about 3,033,277 (268)

Fluorine-Activated and -Directed Allene Cycloadditions with Nitrile Oxides and Imine Oxides: Synthesis of Ring-Fluorinated Isoxazole Derivatives.

Organic Letters, 2023
In this study, 1,1-difluoroallenes underwent a regioselective [2+3] cycloaddition with nitrile oxides and imine oxides in the presence of a AuCl catalyst.
K. Fuchibe, Kazuki Sakon, Kyosuke Suto, Reo Eto, Sho Nakazono, J. Ichikawa   +5 more
semanticscholar   +1 more source

Ru-Catalyzed [3 + 2] Cycloaddition of Nitrile Oxides and Electron-Rich Alkynes with Reversed Regioselectivity.

Organic Letters, 2021
Polarity reversal ("umpolung") of a functional group can override its inherent reactivity and lead to distinct bond-forming modes. Herein we describe a rarely studied cycloaddition between nitrile oxides and electron-rich alkynes with reversed ...
Qiang Feng, Hai Huang, Jianwei Sun
semanticscholar   +1 more source

Catalyst-Free Formation of Nitrile Oxides and Their Further Transformations to Diverse Heterocycles.

Organic Letters, 2021
The formation of nitrile oxides with diazocarbonyl compounds by nitrosyl transfer from tert-butyl nitrite under mild conditions and without the use of a catalyst or an additive is reported.
Luca De Angelis, Alexandra M Crawford, Yong‐Liang Su, Daniel J. Wherritt, H. Arman, M. Doyle   +5 more
semanticscholar   +1 more source

Palladium-Catalyzed (3+3) Annulation of Allenylethylene Carbonates with Nitrile Oxides.

Organic Letters, 2021
In this paper, we designed and synthesized a new type of cyclic carbonates, allenylethylene carbonates (AECs). With AECs as reactive precursors, we developed palladium-catalyzed (3+3) annulation of AECs with nitrile oxides.
Ting Pan, Xing Gao, Sen‐Lin Yang, L. Wang, Yimin Hu, Min Liu, Wei Wang, Yongjun Wu, B. Zheng, Hongchao Guo   +9 more
semanticscholar   +1 more source

1,3-Dipolar Cycloaddition Reactions of Nitrile Oxides under "Non-Conventional" Conditions: Green Solvents, Irradiation, and Continuous Flow.

ChemPlusChem, 2020
The 1,3-dipolar cycloaddition reactions (DCs) of nitrile oxides (NOs) to alkenes and alkynes are useful methods for the synthesis of 2-isoxazolines and isoxazoles respectively, which are important classes of heterocyclic compounds in organic and ...
J. Plumet
semanticscholar   +1 more source

Nitrile Oxides

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Volker Jaeger, Pedro A. Colinas
openaire   +1 more source

In Situ Generation of Nitrile Oxides from NaCl-Oxone Oxidation of Various Aldoximes and Their 1,3-Dipolar Cycloaddition.

Organic Letters, 2019
Reported is a new green protocol for the efficient in situ generation of nitrile oxides through NaCl/Oxone oxidation of aldoximes and their dipolar cycloaddition.
Guodong Zhao, Lixin Liang, Chi Ho Ethan Wen, Rongbiao Tong   +3 more
semanticscholar   +1 more source

Iterative Assembly of Nitrile Oxides and Ynamides: Synthesis of Isoxazoles and Pyrroles.

Journal of Organic Chemistry, 2019
Described is an iterative assembly of nitrile oxides and ynamides for the synthesis of isoxazoles and pyrroles. The nitrile oxides could undergo Cu(I)-free cyclization with terminal ynamides for accessing isoxazoles, which could engage in another ...
Changwei Chen, Sunliang Cui
semanticscholar   +1 more source

DABCO-mediated [3+3] cycloaddition of azomethine imines with in situ generated nitrile oxides from hydroximoyl chlorides.

Chemical Communications, 2019
A novel cross 1,3-dipolar cycloaddition between azomethine imines with in situ generated nitrile oxides has been developed. This is the first example of employing a reaction partner containing two heteroatoms in the [3+3] cycloaddition involving ...
Qing-Yun Fang, Hai-Shan Jin, Ru-Bing Wang, Li-Ming Zhao   +3 more
semanticscholar   +1 more source