Results 81 to 90 of about 3,681 (218)

Synthesis of Isochromans From Anacardic Acids Obtained From Cashew Nutshell Liquid (CNSL) and Their Antimicrobial Activity

Chemistry &Biodiversity, Volume 23, Issue 3, March 2026.
Utilizing anacardic acid derived from cashew nut shell liquid, the synthesis of isochromans was accomplished. Two key steps were exploited. Firstly, a benzylic bromination in the green solvent tert‐butyl acetate is disclosed. Secondly, as an example, the exposure of the secondary alcohol 1‐(2‐methoxy‐6‐(pentadec‐1‐en‐1‐yl)phenyl)ethanol to potassium t ...
Bianca L. Davids, Tianqi Lu, Kennedy J. Ngwira, Manuel A. Fernandes, Sandy van Vuuren, Charles B. de Koning   +5 more
wiley   +1 more source

Synthesis and transformation of halochromones [PDF]

, 2014
Chromones (4H-1-benzopyran-4-ones) are one of the most abundant groups of naturally occurring oxygen containing heterocyclic compounds possessing a benzo-γ-pyrone framework, 1a.
Santos, Clementina M.M., Silva, Artur, Tomé, Sara M.   +2 more
core   +1 more source

Isolation, RP‐UHPLC‐ESI‐LIT‐Orbitrap‐MS/MS‐Based Metabolic Profiling and Anticandidal Activity of the Root and Leaf Secondary Metabolites of Monotes Kerstingii Gilg (Dipterocarpaceae)

Chemistry &Biodiversity, Volume 23, Issue 3, March 2026.
This paper describes the isolation and antifungal activity of secondary metabolites from the leaves and roots of Monotes kerstingii. The distribution of these metabolites in the roots and leaves was achieved through comprehensive RP‐UHPLC‐Orbitrap‐MS and MS/MS analysis.
Sorelle Kache Fotsing, Dominique Ngnintedo, Yanick Kevin Dongmo Melogmo, Alena Soboleva, Kevine Dongmo Jumeta, Bruno Ndjakou Lenta, Fabrice Fekam Boyom, Andrej Frolov, Norbert Arnold, Ludger A. Wessjohann, Norbert Sewald, Bonaventure Tchaleu Ngadjui, Ghislain Wabo Fotso   +12 more
wiley   +1 more source

Ruthenium-catalyzed azide alkyne cycloaddition reaction: scope, mechanism and applications [PDF]

, 2016
The ruthenium-catalyzed azide alkyne cycloaddition (RuAAC) affords 1,5-disubstituted 1,2,3-triazoles in one step and complements the more established copper-catalyzed reaction providing the 1,4-isomer.
Akimova G., Akimova G., Akimova G., Anna Said Stålsmeden, Bader R. F. W., Chandrasekaran S., Das R., Fan W.-Q., Fokin V. V., Gruchlik A., Huisgen R., Johan R. Johansson, Keicher T., Levin J. I., Murahashi S.-I., Neumajer G., Nina Kann, Palaniraja J., Parsons J. G., Schilling C., Tamás Beke-Somfai, Trabocchi A., Yubo J., Zhou Y. B.   +23 more
core   +2 more sources

Heteroaromatization with 4-Hydroxycoumarin Part II: Synthesis of Some New Pyrano[2,3-d]pyrimidines, [1,2,4]triazolo[1,5-c]pyrimidines and Pyrimido[1,6-b]-[1,2,4]triazine Derivatives

Molecules, 2001
A variety of novel [1,2,4]triazolo[1,5-c]pyrimidine-13-ones (4a-f) and (5b-d) could be obtained via reaction of 9-amino-7-(4’-chlorophenyl)-8,9-dihydro-8-imino-6H,7H-[1]benzopyrano[3`,4`:5,6]pyrano[2,3-d]pyrimidine-6-one (3) with a variety of ...
A. H. Bedair, A. H. Fakery, N. A. El-Hady, M. S. Abd El-Latif, A. M. El-Agrody   +4 more
doaj   +1 more source

Cleavages of photochromic compounds derived from heterocycles under electrospray tandem mass spectrometry : study of the influence of the heteroatom in fragmentation mechanisms [PDF]

, 2010
In this paper we report the fragmentation pathways of chromenes derived from carbazole, dibenzofuran and dibenzothiophene, under ESI-MS/MS experimental conditions, and their relationship with structural features, specially focused on the heteroatom’s ...
Campos, Ana M. F. Oliveira, Domingues, M. R. M., Domingues, Pedro, Oliveira, M. Manuel, Peixoto, Francisco, Reis, A.   +5 more
core  

Palladium-catalyzed and electrophilic cyclization approaches to carbocycles and heterocycles [PDF]

, 2008
Palladium-catalyzed and electrophilic cyclization reactions are among the most studied in synthetic organic chemistry. However, these methodologies cannot always be generally applied to obtain good yields of a desired class of compounds.
Worlikar, Shilpa Arvind
core   +3 more sources

Synthesis and Chemical Properties of 3-Phosphono-coumarins and 1,2-Benzoxaphosphorins as Precursors for Bioactive Compounds

Molecules, 2019
Coumarins are an important class of natural heterocyclic compounds that have attracted considerable synthetic and pharmacological interest due to their various biological activities.
Ana I. Koleva, Nevena I. Petkova-Yankova, Rositca D. Nikolova   +2 more
doaj   +1 more source

100 years of chemistry at Rhodes University [PDF]

, 2004
The history of Grahamstown is well documented and two books deal with the history of Rhodes University.1,2 Although the Chemistry Department was one of the founding departments, coverage in the official histories is minimal and sometimes inaccurate or ...
Brown, M E, Eve, Desmond John, Kaye, P T, Rivett, D E A, Watkins, G M   +4 more
core   +1 more source

Metal triflates catalyzed efficient synthesis of 3,4-dihydro-2H-1-benzopyrans [PDF]

, 2002
Ytterbium triflate efficiently catalyzes an unusual cyclization of o-hydroxybenzaldehydes with 2,3-dihydrofuran and 3,4-dihydro-2H-pyran in the presence of trimethyl orthoformate at ambient temperature to afford a new class of compounds, furo- and pyrano[
Aruna, M., Kiran Kumar, S., Kunwar, Ajit C., Ramalingam, T., Subba Reddy, Basi V., Venugopal, Chenna, Yadav, Jhillu S.   +6 more
core   +1 more source