Results 261 to 270 of about 20,875 (302)

Gold-Catalyzed [4 + 1]-Annulation Reactions between 1,4-Diyn-3-ols and Isoxazoles To Construct a Pyrrole Core.

Organic Letters, 2018
This work reports gold-catalyzed [4 + 1]-annulation reactions between 1,4-diyn-3-ols and isoxazoles or benzisoxazoles to yield pyrrole derivatives. The reaction chemoselectivity is controlled by an initial attack of an isoxazole at a less hindered alkyne
Rahul Dadabhau Kardile, Balaji S. Kale, Pankaj Sharma, Rai‐Shung Liu   +3 more
semanticscholar   +1 more source

Synthesis of o-dimethylene isoxazole via isoxazole-fused 3-sulfolene

Tetrahedron Letters, 1992
Abstract Isoxazole-fused 3-sulfolene 12 has been synthesized from the readily available starting material 7 in three steps. Heating compound 12 at 160–180 °C generates o-dimethylene isoxazole 6b which undergoes smooth cycloaddition reactions.
Chang, Ruei-Chih, Chou, Ta-Shue
openaire   +1 more source

Synthesis of 3-Acyl-isoxazoles and Δ2-Isoxazolines from Methyl Ketones, Alkynes or Alkenes, and tert-Butyl Nitrite via a Csp3-H Radical Functionalization/Cycloaddition Cascade.

Organic Letters, 2019
A novel metal-free tandem Csp3-H bond functionalization of ketones and 1,3-dipolar cycloaddition has been developed. An efficient approach to a variety of oxazole and isoxazoline derivatives is demonstrated using the 1,3-dipolar cycloaddition of alkynes ...
P. Dai, Xin Tan, Qian Luo, Xiang Yu, Shuguang Zhang, Fang Liu, Weihua Zhang   +6 more
semanticscholar   +1 more source

Studies in isoxazole chemistry. IV. Isoxazoles via isoxazolines

Canadian Journal of Chemistry, 1970
4- or 5-Chloro- or cyanoisoxazoles, 5-chloromethylisoxazoles, and 5-methylisoxazoles were made by the 1,3-dipolar cycloaddition of nitrile oxides to α-halogeno- or α-alkoxyolefins. In the case of cis- and trans-1,2-dichloroethylene, (5a and b) the intermediate cis- and trans-4,5-dichloroisoxalines (6a and b) were isolated.
openaire   +1 more source

Pyruvic acid-catalyzed one-pot three-component green synthesis of isoxazoles in aqueous medium: a comparable study of conventional heating versus ultra-sonication

Proceedings of the Indian Academy of sciences. Chemical sciences, 2022
S. Deshmukh, A. Nalkar, S. Thopate
semanticscholar   +1 more source

Sea Urchin Embryo Model As a Reliable in Vivo Phenotypic Screen to Characterize Selective Antimitotic Molecules. Comparative evaluation of Combretapyrazoles, -isoxazoles, -1,2,3-triazoles, and -pyrroles as Tubulin-Binding Agents.

ACS Combinatorial Science, 2018
A series of both novel and reported combretastatin analogues, including diarylpyrazoles, -isoxazoles, -1,2,3-triazoles, and -pyrroles, were synthesized via improved protocols to evaluate their antimitotic antitubulin activity using in vivo sea urchin ...
M. Semenova, D. Demchuk, D. V. Tsyganov, N. B. Chernysheva, A. V. Samet, E. A. Silyanova, V. P. Kislyi, A. S. Maksimenko, A. E. Varakutin, L. Konyushkin, M. M. Raihstat, A. Kiselyov, V. Semenov   +12 more
semanticscholar   +1 more source

Synthesis of new isoxazole derivatives

Russian Journal of Organic Chemistry, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
V. M. Ismailov, M. M. Kantaeva, I. A. Mamedov, N. N. Yusubov   +3 more
openaire   +1 more source

Transformation of 1,2,3,7a-tetrahydroimidazo[1,2-b]isoxazole derivatives into isoxazoles

Russian Chemical Bulletin, 2007
The reactions of 1,2,3,7a-tetrahydroimidazo[1,2-b]isoxazole derivatives with electrophilic reagents, such as protic acids, benzoyl chloride, BF3, and bromine, produce isoxazole, 2,2,3,3-tetramethylaziridine, and 2,3,3-trimethylpropen-2-ylamine derivatives.
N. V. Chukanov, S. A. Popov, G. V. Romanenko, V. A. Reznikova   +3 more
openaire   +1 more source

ChemInform Abstract: Oxazolo(4,5‐d)isoxazole Derivatives and 3,4‐Disubstituted Isoxazoles from Isoxazol‐5(4H)‐ones.

ChemInform, 1993
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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.
E. M. BECCALLI, A. MARCHESINI, T. PILATI
openaire   +1 more source

The main directions and recent trends in the synthesis and use of isoxazoles

Chemistry of Heterocyclic Compounds, 2020
O. B. Bondarenko, N. Zyk
semanticscholar   +1 more source