Results 231 to 240 of about 24,568 (261)

Synthesis of Isoxazole- and Oxazole-4-carboxylic Acids Derivatives by Controlled Isoxazole-Azirine-Isoxazole/Oxazole Isomerization

The Journal of Organic Chemistry, 2019
The first synthesis of isoxazole-4-carboxylic acid derivatives by domino isoxazole-isoxazole isomerization is reported. Fe(II)-catalyzed isomerization of 4-acyl-5-methoxy-/5-aminoisoxazoles (dioxane, 105 °C) leads to the formation of isoxazole-4-carboxylic esters and amides in good yields. 4-Formyl-5-methoxyisoxazoles give methyl oxazole-4-carboxylates
Anna V. Serebryannikova, Ekaterina E. Galenko, Mikhail S. Novikov, Alexander F. Khlebnikov   +3 more
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Oxazolo[4,5-d]isoxazole Derivatives and 3,4-Disubstituted Isoxazoles from Isoxazol-5(4H)-ones

Synthetic Communications, 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   +3 more sources

Isoxazoles—II

Tetrahedron, 1967
Abstract The structure and the spectra of several aminoalkylisoxazoles are presented. Proof is given that aminomethylation (mannich reaction) of isoxazoles can involve different nucleophilic centres.
G. Palamidessi, L. Bernardi, G. Diqual, W. Barbieri, S. Coda, V. Colò   +5 more
openaire   +2 more sources

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

Tetrahedron Letters, 1992
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.
Chang, Ruei-Chih, Chou, Ta-Shue
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Trisubstituted isoxazoles from 3,4-disubstituted-(2H)-isoxazol-5-ones

Tetrahedron, 1998
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, M.L. Gelmi, A. Marchesini
openaire   +3 more sources

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 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
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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.
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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

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