Results 171 to 180 of about 1,317 (206)

Glycolurils in the synthesis of fused polyheterocyclic compounds

Chemistry of Heterocyclic Compounds, 2017
We present a comprehensive analysis of data published over the last decade about the methods applicable to the synthesis of fused polyheterocyclic compounds on the basis of glycolurils.
Yana A. Barsegyan, Vladimir V. Baranov, Angelina N. Kravchenko   +2 more
openaire   +1 more source

Photochemical reactions in five and six-membered polyheterocycles synthesis

Synthetic Communications, 2019
Heterocycles are present in the drugs and pesticides in a major proportion and development of new strategies for the synthesis of these compounds is attractive topic for the synthetic and medicinal chemists.
N. Kaur, Pranshu Bhardwaj, M. Devi, Y. Verma, Pooja Grewal   +4 more
semanticscholar   +1 more source

Synthesis of New Polyheterocyclic Compounds Based on Chalcones

Russian Journal of Organic Chemistry, 2019
The reaction of methyl N-{4-[2-(2-oxo-2,3-dihydro-1H-indol-3-ylidene)acetyl]phenyl}carbamate with tosylmethyl isocyanide in tetrahydrofuran in the presence of potassium tert-butoxide led to the formation of methyl N-{4-[(4-oxo-4,5-dihydro-3H-pyrrolo[2,3-c]quinolin-1-yl)carbonyl]phenyl}carbamate. Three-component condensation of methyl N-{4-[(E)-3-R-prop-
A. V. Velikorodov, N. N. Stepkina, M. A. Polovinkina, V. P. Osipova   +3 more
openaire   +1 more source

Novel alicyclic dianhydrides and polyheterocycles on their basis

Makromolekulare Chemie. Macromolecular Symposia, 1991
AbstractDianhydrides of alicyclic tetracarboxylic acids were synthesized by chemical modification of tri‐cyclodecenetetracarboxylic dianhydride and its chloro‐containing derivatives. By polycondensation of these di‐anhydrides with diamines polyimides were obtained. Thermal and thermooxidative degradation of these polyimides are discussed.
B. A. Zhubanov, N.Y U. Shpilman, O. A. Almabekov, V. A. Solomin, K. O. Kozybaev   +4 more
openaire   +1 more source

The Concept of Polyheterocyclic Strategy

1997
This strategy is a synthetic procedure for the synthesis of molecules with multiple linked heterocyclic rings. This is important in fields such as medicine and materials science due to the diverse biological activities of these molecules, including antitumor and antimicrobial properties, as well as other valid applications.
openaire   +1 more source

Cationic Gold(I)-Catalyzed Cascade Bicyclizations for Divergent Synthesis of (Spiro)polyheterocycles

ACS Catalysis, 2018
We herein report an expeditious synthetic strategy to access diverse (spiro)polyheterocycles from easily available starting materials in two operational steps including an Ugi four-component reaction and a cationic gold(I)-catalyzed cascade bicyclization.
Zhenghua Li, Liangliang Song, L. Van Meervelt, Guilong Tian, E. V. Van der Eycken   +4 more
semanticscholar   +1 more source

Regioselective Synthesis of Coumarin‐Annulated Polyheterocycles by [3,3] Sigmatropic Rearrangement

Synthetic Communications, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
K. C. Majumdar, B. Chattopadhyay
openaire   +1 more source

Synthesis of bioactive polyheterocyclic ring systems as 5α-reductase inhibitors

European Journal of Medicinal Chemistry, 2010
Simple synthetic strategies for the hitherto unreported [1,2,4]triazolo[4,3-a]pyrido[4,3-d]pyrimidines 8 and [1,2,4]triazolo[4',3':1,2]pyrimido[4,5-b][1,6]naphthyridine-5-one 15 are described based on reaction of thione 3 and 12 with hydrazonoyl chloride 1a-h, respectively.
Naglaa A, Abdel Hafez, Thoraya A, Farghaly, Mohamed A, Al-Omar, Mohamed M, Abdalla   +3 more
openaire   +2 more sources

New polyheterocycles derived from pyrano[4,3-b]thieno[3,2-e]pyridine

Russian chemical bulletin, 2023
V. V. Dabaeva, M. R. Bagdasaryan, I. Barkhudaryants, E. Paronikyan, S. Dashyan   +4 more
semanticscholar   +1 more source

Chemo‐ and Diastereoselective Synthesis of Polyheterocycles by Rhodium(III)‐Catalyzed sp2/sp3 C–H Activation of 2‐Arylquinazolin‐4(3H)‐ones with 3‐Methylmaleimides

Advanced Synthesis & Catalysis, 2023
Shreedhar Devkota, M. S. Akhtar, Y. Lee
semanticscholar   +1 more source