Results 191 to 200 of about 31,299 (256)

1,7-Electrocyclisation of non-stabilised azomethine ylides

Tetrahedron Letters, 1998
Abstract Non-stablilised α,β;γ,δ-unsaturated azomethine ylides 3 were generated by the decarboxylation method from 3,3-diarylpropenals 1 and secondary amino acids 2 . 1,7-Electrocyclisation of these azomethine ylides, followed by a 1,5-hydrogen shift, gives 2,3-dihydro-1 H -2-benzazephines 4 .
Andrea Arany, Paul W. Groundwater, Miklòs Nyerges   +2 more
openaire   +1 more source

Azomethine ylide generation via the dipole cascade

Tetrahedron, 1992
Abstract A series of N-acyl 2-diazo-3-oxobutanoates, when treated with a catalytic quantity of a rhodium(II) carboxylate, were found to afford substituted pyrroles derived from an azomethine ylide intermediate. The initial reaction involves generation of the expected carbonyl ylide dipole by intramolecular cyclization of the keto carbenoid onto the ...
Albert Padwa, Dennis C. Dean, Donald L. Hertzog, William R. Nadler, Lin Zhi   +4 more
openaire   +1 more source

ChemInform Abstract: Enantioselective Cycloadditions of Azomethine Ylides

ChemInform, 2009
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Carmen Najera, Jose M. Sansano
openaire   +1 more source

Fused aziridines as sources of azomethine ylides

Chemistry of Heterocyclic Compounds, 2012
The use of fused aziridines as sources of azomethine ylides in the synthesis of polyheterocyclic compounds is examined. Features of thermo- and photolytic opening of aziridines and aspects of the stereo-, regio-, and chemoselectivity of cycloaddition and electrocyclization of azomethine ylides are discussed.
A. F. Khlebnikov, M. S. Novikov
openaire   +1 more source

Azomethine, carbonyl and thiocarbonyl ylides

2002
Abstract Simple addition of a carbene or carbenoid to a C-N double bond would be expected to result in the formation of an azomethine ylide. This is consistent with electrophilic attack of the carbene at the nitrogen atom lone pair. Formation of ylides in this manner was reviewed by Padwa and Hornbuckle in 1991.
openaire   +1 more source

Dearomative (3+2) cycloaddition of 2-substituted 3,5-dinitropyridines and N-methyl azomethine ylide

Chemistry of Heterocyclic Compounds, 2019
M. Bastrakov, A. K. Fedorenko, A. Starosotnikov, V. Kachala, S. Shevelev   +4 more
semanticscholar   +1 more source

Ligand-Controlled Inversion of Diastereo- and Enantioselectivity in Silver-Catalyzed Azomethine Ylide-Imine Cycloaddition of Glycine Aldimino Esters with Imines.

Organic Letters, 2018
Bo Yu, Ke-Fang Yang, X. Bai, Jian Cao, Zhanjiang Zheng, Yu-Ming Cui, Zheng Xu, Li Li, Li‐Wen Xu   +8 more
semanticscholar   +1 more source

Transition-Metal-Free Access to Pyridocarbazoles from 2-Alkynylindole-3-carbaldehydes via Azomethine Ylide.

Journal of Organic Chemistry, 2018
Shalini Verma, P. Mishra, M. Kumar, Souvik Sur, A. Verma   +4 more
semanticscholar   +1 more source

Direct N-H/α,α,β,β-C(sp3)-H functionalization of piperidine via an azomethine ylide route: synthesis of spirooxindoles bearing 3-substituted oxindoles.

Chemical Communications, 2017
Yanlong Du, Aimin Yu, Jiru Jia, You-Cai Zhang, Xiangtai Meng   +4 more
semanticscholar   +1 more source

A leap forward in sulfonium salt and sulfur ylide chemistry

Chinese Chemical Letters, 2021
Yun Wei, Jiajing Tan, Hiroto Yoshida
exaly