Results 181 to 190 of about 12,240 (259)

Regio- and diastereoselectivity of the cycloaddition of nitrones with N-propadienylindole and pyrroles

Tetrahedron, 2018
Mariia M Efremova, Alexander S Novikov, Rafael R Kostikov   +2 more
exaly   +2 more sources

Cyclic nitrones. I. Reactions of α-keto nitrones at nitrone carbon

Australian Journal of Chemistry, 1967
The chemistry of 3,4,5,6-tetrahydro-3-oxopyridine 1-oxides has been studied with respect to: reaction with hydrazine-the 6,6-dimethyl compound (IV) gave a hydrazone (VII) by ring contraction following initial attack at C 2; (ii)(ii) 2-arylation with diazonium salts, e.g. conversion of (III) into (XIII); (iii) acid- and base-catalysed deuterium exchange
RFC Brown, L Subrahmanyan, CP Whittle
openaire   +1 more source

Nitronates

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Scott E. Denmark, Jeromy J. Cottell
openaire   +1 more source

Cycloadditions of Trans‐Cyclooctenes and Nitrones as Tools for Bioorthogonal Labelling

ChemBioChem, 2020
Trans‐cyclooctenes (TCOs) represent interesting and highly reactive dipolarophiles for organic transformations including bioorthogonal chemistry. Herein we show that TCOs react rapidly with nitrones and that these reactions are bioorthogonal.
Kaitlyn D. Margison, D. A. Bilodeau, F. Mahmoudi, J. Pezacki   +3 more
semanticscholar   +1 more source

Eu(OTf)3-Catalyzed Formal Dipolar [4π + 2σ] Cycloaddition of Bicyclo-[1.1.0]butanes with Nitrones: Access to Polysubstituted 2-Oxa-3-azabicyclo[3.1.1]heptanes.

Angewandte Chemie
Herein, we have synthesized multifunctionalized 2-oxa-3-azabicyclo[3.1.1]heptanes, which are considered potential bioisosteres for meta-substituted arenes, through Eu(OTf)3-catalyzed formal dipolar [4π+2σ] cycloaddition of bicyclo[1.1.0]butanes with ...
Jian Zhang, Jia-Yi Su, Hanliang Zheng, Hao Li, Wei-Ping Deng   +4 more
semanticscholar   +1 more source

Nitrones

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Raymond C. F. Jones, Jason N. Martin
openaire   +1 more source

Copper-Catalyzed Enantioselective [4π + 2σ] Cycloaddition of Bicyclobutanes with Nitrones.

Journal of the American Chemical Society
The selective construction of bridged bicyclic scaffolds has garnered increasing attention because of their extensive use as saturated bioisosteres of arene in pharmaceutical industry.
Xuan-Ge Zhang, Zi-Yang Zhou, Jia-Xin Li, Jun-Jia Chen, Qi-Lin Zhou   +4 more
semanticscholar   +1 more source

Gold-Catalyzed Oxidative Arylations of 3-Butyn-1-ols and 2-Propyn-1-ols with Nitrones to Yield Distinct Fused Indoles Bearing a Heterocyclic Ring

ACS Catalysis, 2019
The catalytic formation of various fused indoles from the nitrone oxidations of 1-substituted n-yn-1-ols (n = 2, 3) is described. For 3-butyn-1-ols, the oxidations yield tetrahydropyrano[4,3-b]indoles, whereas 2-propynols deliver tetrahydro-[1,2]oxazino ...
Rajkumar Lalji Sahani, Rai‐Shung Liu
semanticscholar   +1 more source

Nitrones. Part III. Photolysis of cyclic nitrones

Journal of the Chemical Society C: Organic, 1966
Ultraviolet irradiation of 2-substituted 1-pyrroline 1-oxides yielded corresponding bicyclic oxaziridines. Prolonged irradiation of the 3,3,5-trimethyl-6-oxa-1-azabicyclo[3,1,0]hexane gave an N-acetylazetidine and a pyrroline. Acid hydrolyses of 2,2,5- and 3,3,5-trimethyl-6-oxa-1-azabicyclo[3,1,0]hexane yielded acetonylacetone and 3,3-dimethylpentan-5 ...
L. S. Kaminsky, M. Lamchen
openaire   +1 more source

Metal-free synthesis of triarylated (Z)-nitrones via H2O-mediated 1,3-dipolar transfer under aerobic conditions

Green Chemistry, 2019
A new and environmentally benign protocol aimed at the generation of triarylated (Z)-nitrones in generally good yield has been developed via metal- and catalyst-free H2O-mediated 1,3-dipolar transfer reaction of para-quinone methides (p-QMs) with ...
Ke-Wei Chen, Wen-Juan Hao, S. Tu, Bo Jiang   +3 more
semanticscholar   +1 more source