Results 141 to 150 of about 888 (170)

New processable low band-gap, conjugated polyheterocycles

Synthetic Metals, 1993
Abstract Poly(2,3-dihexylthieno[3,4-b]pyrazine) (2b) has been prepared by ferric chloride polymerization of 2,3-dihexylthieno[3,4-b]pyrazine(4) and studied. It is a dark blue-black soluble material which becomes light yellow in the doped state as either a solution or film. Doped films can be cast directly from solution.
Martin Pomerantz, Benjamin Chaloner-Gill, Larry O. Harding, John J. Tseng, Wendy J. Pomerantz   +4 more
openaire   +1 more source

New Applications of Ninhydrin in the Synthesis of Polyheterocyclic Compounds

Russian Journal of Organic Chemistry, 2023
The review demonstrates new areas of application of ninhydrin as a universal reagent in organic synthesis for the construction of a wide range of polycyclic compounds with benzofuran, pyrroline, pyrrole, imidazole, pyrimidine, propellanic and other fragments.
A. V. Velikorodov, A. S. Zukhairaeva, E. N. Kutlalieva, E. A. Shustova, S. B. Nosachev   +4 more
openaire   +1 more source

Substrate-controlled switchable asymmetric annulations to access polyheterocyclic skeletons

Chemical Communications, 2016
Substrate-controlled switchable asymmetric annulations of Morita–Baylis–Hillman carbonates from isatins and α-cyano-α,β-unsaturated ketones catalysed by cinchona-derived tertiary amines, giving tetrahydrofuro[2′,3′:4,5]pyrano[2,3-b]indoles or spirooxindoles incorporating a cyclopentene motif, were disclosed.
Kai-Kai, Wang, Pan, Wang, Qin, Ouyang, Wei, Du, Ying-Chun, Chen   +4 more
openaire   +2 more sources

Synthesis and antifungal activities of novel polyheterocyclic spirooxindole derivatives

Organic & Biomolecular Chemistry, 2015
A series of spirooxindole tetrahydrofuran derivatives were obtained in moderate to good yields via base-mediated cascade [3+2] double Michael reactions under mild conditions. Their antifungal effects on selected five target phytopathogenic fungi were investigated, and their structure antifungal activity relationships were also discussed.
Jia-Shou, Wu, Xue, Zhang, Ying-Lao, Zhang, Jian-Wu, Xie   +3 more
openaire   +2 more sources

Polyheterocyclic conductors from N-(ortho-substituted phenyl)pyrroles

J. Chem. Soc., Chem. Commun., 1983
Voltammetric studies are reported which show that both electronic and steric effects are important in the electrosynthesis of organic metal films from N-(ortho-substituted phenyl)pyrroles in agreement with n.m.r. studies reported by other workers; the resulting films employed as electrodes yield well defined cyclic voltammograms similar to those ...
Manuel Salmón, Ma Eugenia Carbajal, Martha Aguilar, Miguel Saloma, Juan Carlos Juárez   +4 more
openaire   +1 more source

Silver‐Catalyzed Carbon‐Phosphorus Functionalization for Polyheterocycle Formation

Advanced Synthesis & Catalysis, 2017
AbstractPolyheterocycle construction with high diastereoselectivity by utilizing a radical process is still problematic. In this communication, a silver‐catalyzed carbon‐phosphorus functionalization for polyheterocycle formation is described that furnishes good diastereoselectivity.
Jianming Liu, Shanshan Zhao, Weiwei Song, Rong Li, Xinyu Guo, Kelei Zhuo, Yuanyuan Yue   +6 more
openaire   +1 more source

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
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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
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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.
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