Results 131 to 140 of about 1,013 (159)

Copper-mediated C H amination of 2H-indazoles with N–Fluorobenzenesulfonimide

Tetrahedron Letters, 2021
Abstract A facile copper-catalyzed amination in C-3 position of 2H-indazoles using commercially available N-fluorobenzenesulfonimide (NFSI) as an amidating reagent was established in this paper. The results revealed broad substrate scope in moderate to good yields under mild conditions.
Zhenhua Li, Lixian Ye, Yingyan Cao, Jinjing Qin, Wenbiao Wang, Yuanyuan Xie   +5 more
openaire   +1 more source

Innovative cascade reaction for 2H-indazole derivative synthesis

Molecular Diversity
In the realm of synthetic organic chemistry, by using a one-pot sequential combination of MCR, it is possible to manufacture chemical commodities (fine chemicals, agrochemicals, and pharmaceutical substances) that enhance our quality of life while generating less waste materials and increasing economic advantages. With this motivation, using a "one-pot"
Annu, Choudhary, Rohit, Patel, Dweipayan, Goswami, Kishor H, Chikhalia   +3 more
openaire   +2 more sources

Product Class 2: 1H‐ and 2H‐Indazoles

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
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ChemInform Abstract: Direct Arylation of 2H‐Indazoles on Water.

ChemInform, 2010
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.
Stephen A. Ohnmacht, Andrew J. Culshaw, Michael F. Greaney   +2 more
openaire   +1 more source

Synthesis and Biological Activity of 4,5,6,7-Tetrahydro-2H-indazole Derivatives

Russian Journal of General Chemistry, 2019
Novel 4,5,6,7-tetrahydro-2H-indazole derivatives were obtained via the reaction of N1,N3,2-triaryl-6-hydroxy-6-methyl-4-oxocyclohexane-1,3-dicarboxamides with hydrazine hydrate. The reaction of 4-oxocyclo-hexane-1,3-dicarboxamides with phenylhydrazine led to the formation of hydrazones instead of indazoles.
V. L. Gein, A. N. Yankin, N. V. Nosova, E. B. Levandovskaya, V. V. Novikova, I. P. Rudakova   +5 more
openaire   +1 more source

ChemInform Abstract: Recent Synthetic Approaches to 1H‐ and 2H‐Indazoles

ChemInform, 2011
AbstractReview: 57 refs.
Nadezda Cankarova, Jan Hlavac, Viktor Krchnak   +2 more
openaire   +1 more source

Iodine-catalyzed aerobic oxidation of o-alkylazoarenes to 2H-indazoles

Tetrahedron, 2017
Abstract An iodine-catalyzed aerobic-oxidative C-H functionalization of o-alkylazoarenes to afford 2H-indazoles has been developed. CuI was found to be an effective additive to accelerate the regeneration of iodine in the catalytic cycle. This catalytic system is suitable for both electron-rich and electron-deficient azoarenes and tolerates a variety
Xiangli Yi, Chanjuan Xi
openaire   +1 more source

ChemInform Abstract: INDAZOLE STUDIES. 3. THE BROMINATION OF 2‐PHENYL‐2H‐INDAZOLE. FORMATION AND STRUCTURE DETERMINATION OF MONO‐, DI‐, AND TRIBROMO‐2‐PHENYL‐2H‐INDAZOLES

Chemischer Informationsdienst, 1985
Abstract2‐Phenyl‐2H‐indazol (I) liefert bei der Bromierung je nach den Bedingungen (BromIII Menge, Temperatur) die Bromierungsprodukte (II)‐(V).
P. S. WAALWIJK, P. COHEN‐FERNANDES, C. L. HABRAKEN   +2 more
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ChemInform Abstract: PHOTOCHEMISTRY OF 1H‐ AND 2H‐INDAZOLES IN ACIDIC SOLUTION

Chemischer Informationsdienst, 1979
AbstractBei der Behandlung entsprechender Indazole (I) bzw. (II) in schwefelsaurer Lösung a) in H2O und b) in Alkoholen wie Methanol werden über intermediäre Nitreniumionen die Carbonylverbindungen (III)‐(VI) gebildet, die teilweise alsrO‐, N‐Monoacetyl‐ bzw. QN‐Bisacetyl‐Derivate charakterisiert werden.
E. GEORGARAKIS, H. SCHMID, H.‐J. HANSEN   +2 more
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A new effective route for the synthesis of substituted 2h-indazoles

Chemistry of Heterocyclic Compounds, 2009
A two-stage synthesis of 2H-indazoles has been established, based on consecutive reactions of reduction of 2-alkyl-, 2-cyclopropyl-, and 2-arylcarbonylazobenzenes to phenylazo-substituted benzyl alcohols and intramolecular heterocyclization of the reduction products under the influence of organic acids.
S. S. Mochalov, M. I. Khasanov, E. V. Trofimova, A. N. Fedotov, N. S. Zefirov   +4 more
openaire   +1 more source