Results 261 to 270 of about 19,561 (308)

ChemInform Abstract: Ozonolysis of Substituted Isoxazoles.

ChemInform, 1994
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.
K. Takahashi, Choji Kashima, Akira Hosomi   +2 more
openaire   +3 more sources

Synthesis of Furoxans and Isoxazoles via Divergent [2 + 1 + 1 + 1] Annulations of Sulfoxonium Ylides and tBuONO.

Organic Letters, 2019
We have presented a simple and new method for the divergent assembly of furoxans and isoxazoles in which the [2 + 1 + 1 + 1] annulation reaction of sulfoxonium ylides is reported for the first time.
Zhonghe Tang, Yao Zhou, Q. Song
semanticscholar   +1 more source

Synthesis of new isoxazole derivatives

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

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   +2 more sources

Zinc-Catalyzed Asymmetric Formal [4+3] Annulation of Isoxazoles with Enynol Ethers via 6π Electrocyclization: Stereoselective Access to 2H-Azepines.

Angewandte Chemie, 2019
6π electrocyclization has attracted considerable interest in organic synthesis because of its high stereospecificity and atom economy in the construction of versatile 5- to 7-membered cycles.
Xinhai Zhu, Ze‐Shu Wang, Bo Hou, Hao‐Wen Zhang, Chao Deng, L. Ye   +5 more
semanticscholar   +1 more source

Synthesis of Spiro[indole-3,5'-isoxazoles] with Anticancer Activity via a Formal [4 + 1]-Spirocyclization of Nitroalkenes to Indoles.

Journal of Organic Chemistry, 2019
An acid-assisted [4 + 1]-cycloaddition of indoles with nitrostyrenes affords 4' H-spiro[indole-3,5'-isoxazoles] in a diastereomerically pure form. Several of these spirocyclic molecules exhibit promising anticancer activity by reducing viability and ...
Alexander V Aksenov, D. Aksenov, Nikolai A. Arutiunov, N. Aksenov, E. Aleksandrova, Zhenze Zhao, Liqin Du, A. Kornienko, M. Rubin   +8 more
semanticscholar   +1 more source

Synthesis of 4-Sulfenyl Isoxazoles through AlCl3-Mediated Electrophilic Cyclization and Sulfenylation of 2-Alkyn-1-one O-Methyloximes.

Journal of Organic Chemistry, 2019
An efficient method for the synthesis of 4-sulfenyl isoxazoles has been developed via AlCl3-mediated electrophilic cyclization/sulfenylation of 2-alkyn-1-one O-methyloximes.
Wenchao Gao, Yu-Fei Cheng, Hong‐Hong Chang, Xing Li, Wenlong Wei, Peng Yang   +5 more
semanticscholar   +1 more source

An asymmetric isoxazole annulation

Journal of Heterocyclic Chemistry, 1988
AbstractAn Asymmetric isoxazole annulation proceeds from the (S)‐O‐methoxyphenylalaninol imine of (RS)‐2‐phen‐ylpropionaldehyde (3). Deprotonation, quenching with 4‐chloromethyl‐3,5‐dimethylisoxazole, and hydrolysis produced isoxazolylaldehyde (5), whose structure was confirmed by single crystal X‐ray diffractometry. The absolute configuration of (‐)‐5
Ludwig Schlicksupp, Brian E. Marron, Nicholas R. Natale   +2 more
openaire   +3 more sources

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

Electronic structure of isoxazole

Bulletin of the Academy of Sciences, USSR Division of Chemical Science, 1966
1. The scheme of the levels, the molecular diagram, and the indices of the reactivity of isoxazole were calculated by the simple LCAO MO method using the Huckel approximation. 2. Within the framework of the given approximation it was shown that for radical and nucleophilic substitution reactions the reactivity of the different positions ...
A. V. Tutkevich, Alexander A. Bagaturyants, D. A. Bochvar   +2 more
openaire   +2 more sources