Results 21 to 30 of about 88,147 (300)

Free-radical cyclization approach to polyheterocycles containing pyrrole and pyridine rings

Beilstein Journal of Organic Chemistry, 2021
A wide range of derivatives with new pyrido[2,1-a]pyrrolo[3,4-c]isoquinoline skeleton was synthesized by free-radical intramolecular cyclization of o-bromophenyl-substituted pyrrolylpyridinium salts using the (TMS)3SiH/AIBN system.
Ivan P. Mosiagin, Olesya A. Tomashenko, Dar’ya V. Spiridonova, Mikhail S. Novikov, Sergey P. Tunik, Alexander F. Khlebnikov   +5 more
doaj   +1 more source

Rate Dependence on Inductive and Resonance Effects for the Organocatalyzed Enantioselective Conjugate Addition of Alkenyl and Alkynyl Boronic Acids to β-Indolyl Enones and β-Pyrrolyl Enones

Molecules, 2021
Two key factors bear on reaction rates for the conjugate addition of alkenyl boronic acids to heteroaryl-appended enones: the proximity of inductively electron-withdrawing heteroatoms to the site of bond formation and the resonance contribution of ...
Amy Boylan, Thien S. Nguyen, Brian J. Lundy, Jian-Yuan Li, Ravikrishna Vallakati, Sasha Sundstrom, Jeremy A. May   +6 more
doaj   +1 more source

4,5,6,7-Tetrahydroindol-4-Ones as a Valuable Starting Point for the Synthesis of Polyheterocyclic Structures

Molecules, 2021
This review focuses on the synthesis of polyheterocyclic structures with a variety of medicinal and optoelectronic applications, starting from readily available 4,5,6,7-tetrahydroindol-4-one analogs. First, routes toward the 4,5,6,7-tetrahydroindol-4-one
Tomas Horsten, Wim Dehaen
doaj   +1 more source

The Adductomics of Isolevuglandins: Oxidation of IsoLG Pyrrole Intermediates Generates Pyrrole–Pyrrole Crosslinks and Lactams [PDF]

High-Throughput, 2019
Isoprostane endoperoxides generated by free radical-induced oxidation of arachidonates, and prostaglandin endoperoxides generated through enzymatic cyclooxygenation of arachidonate, rearrange nonenzymatically to isoprostanes and a family of stereo and structurally isomeric γ-ketoaldehyde seco-isoprostanes, collectively known as isolevuglandins (isoLGs).
Wenzhao Bi, Geeng-Fu Jang, Lei Zhang, John W. Crabb, James Laird, Mikhail Linetsky, Robert G. Salomon   +6 more
openaire   +2 more sources

{2,2′-[3-Azapentane-1,5-diylbis(nitrilomethylidyne)]dipyrrol-1-yl}(4-methylpyridine)cobalt(III) tetraphenylborate

Acta Crystallographica Section E, 2010
The title compound, [Co(C14H17N5)(C6H7N)](C24H20B) or [Co{(pyrrole)2dien}(4-Mepy)]BPh4 where (pyrrole)2dien is 2,2′-[(3-azapentane-1,5-diylbis(nitrilomethylidyne)]dipyrrole and 4-Mepy is 4-methylpyridine, contains a pentadentate (pyrrole)2dien ...
Mahmood Karimi Abdolmaleki, Kurt Mereiter, Mehdi Amirnasr, Soraia Meghdadi   +3 more
doaj   +1 more source

Chemical defenses of the Caribbean sponges Agelas wiedenmayeri and Agelas conifera [PDF]

, 2000
Previous studies have determined that Caribbean reef sponges of the genus Agelas are chemically defended from fish predation by brominated pyrrole alkaloids, and that the compounds responsible for this defense have been elucidated for one species, Agelas
Assmann, M., Köck, Matthias, Lichte, Ellen, Pawlik, J. R.   +3 more
core   +1 more source

A Dicationic Calix 4 Pyrrole Derivative and Its Use for the Selective Recognition and Displacement-Based Sensing of Pyrophosphate [PDF]

, 2012
A new bis-pyridinium calix[4] pyrrole derivative is reported. This system forms a non-fluorescent complex upon exposure to the chromenolate anion. The resulting supramolecular ensemble binds the pyrophosphate anion with high affinity (K-a (2.55 +/- 0.12)
Hwang, Hyonseok, Kim, Dong Sub, Lee, Cang-Hee, Sessler, Jonathan L., Sokkalingam, Punida   +4 more
core   +1 more source

Scientific Opinion on Flavouring Group Evaluation 77, Revision 1 (FGE.77Rev1): Consideration of Pyridine, Pyrrole and Quinoline Derivatives evaluated by JECFA (63^rd meeting) structurally related to Pyridine, Pyrrole, Indole and Quinoline Derivatives evaluated by EFSA in FGE.24Rev2 (2013) [PDF]

EFSA Journal, 2014
The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to consider evaluations of flavouring substances assessed since 2000 by the Joint FAO/WHO Expert Committee on Food Additives
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Flexible synthesis of polyfunctionalised 3-fluoropyrroles [PDF]

, 2016
An efficient and selective approach for the synthesis of polyfunctionalised 3-fluoropyrroles has been developed starting from commercial aldehydes.
Cogswell, Thomas J., Donald, Craig S., Marquez, Rodolfo   +2 more
core   +1 more source

Novel enantiopure bis(pyrrolo)tetrathiafulvalene donors exhibiting chiral crystal packing arrangements [PDF]

, 2009
Two novel enantiopure bis(pyrrolo[3,4-d])tetrathiafulvalene derivatives, substrates for preparing chiral conducting materials, show chiral crystal packing arrangements in which successive layers are rotated in accordance with an exact or approximate 43 ...
Andrew C. Brooks, Brown, Chas, Coronado, Dunitz, Farrugia, Griffiths, Hongchao Li, Jeppesen, Jeppesen, John D. Wallis, Kini, Kobayashi, Krstic, Lee Martin, Louise Male, Macrae, Martin, Martin, Matsumiya, Peter Day, Peter Horton, Rajca, Rikken, Réthoré, Réthoré, Sheldrick, Songjie Yang   +27 more
core   +1 more source