Neurotrophic and anti-neuroinflammatory constituents from the aerial parts of Coriandrum sativum
作者:Joon Min Cha、DaHye Yoon、Sun Yeou Kim、Chung Sub Kim、Kang Ro Lee
DOI:10.1016/j.bioorg.2020.104443
日期:2020.12
biologically active compounds from medicinal sources, we investigated the MeOH extract of the aerial parts of Coriandrum sativum Linn. An extended phytochemical investigation of the aerial parts of C. sativum led to the isolation and identification of seven compounds (1–7) including two new isocoumarin glycosides (1–2) and a new phenolic glycoside (5). The chemical structures of the new compounds (1, 2, and
Tuning Diketodioxinone Reactivity: Biomimetic Synthesis of the Resorcylate Antibiotic Fungal Metabolites <i>ent</i>-W1278A, -B, and -C, Using Iterative Aromatization Reactions
作者:Ismael Navarro、Christoph Pöverlein、Gerhard Schlingmann、Anthony G. M. Barrett
DOI:10.1021/jo9015858
日期:2009.11.6
The onset temperature of the retro-Diels-Alder reactions of diketo-1,3-dioxin-2-ones to generate alpha,gamma,epsilon-triketo-ketenes was found to be significantly reduced with 2-phenyl substitution. These ketenes, generated at 78 degrees C, were trapped with alcohols to provide resorcylate esters following aromatization by sequential reaction with cesium acetate and trifluoroacetic acid. The methodology was applied iteratively to the total synthesis of the resorcylate antibiotics W1278A, -B, and -C. It is noteworthy that in this process the linking of the monomer units occurs during construction of the aromatic ring.
Biomimetic Total Synthesis of Angelicoin A and B via a Palladium-Catalyzed Decarboxylative Prenylation-Aromatization Sequence
作者:Katie Anderson、Frederick Calo、Toni Pfaffeneder、Andrew J. P. White、Anthony G. M. Barrett
DOI:10.1021/ol202320m
日期:2011.11.4
Five-step total syntheses of angelicoin A and B from 2,2,6-trimethyl-4-dioxinone are reported using late stage biomimetic aromatization reactions via diketo-dioxinones as intermediates. In addition, with angelicoin A, this aromatization was coupled with a palladium-catalyzed decarboxylative prenylation in a one-pot sequence as the key step.
Two novel tetracycles, cassibiphenols A and B from the flowers of Cassia siamea
Chemical investigation of the flowers of Cassiasiamea (Leguminosae), resulted in the isolation of two novel tetracycles connecting 5-(2-hydroxypropyl)benzene-1,3-diol, cassibiphenols A (1) and B (2). The structures were elucidated by analysis of the 1D, 2D NMR, and HRMS spectra. Synthesis of a tetracyclic core of 1 and 2 led to determine the absolute configuration of 1 and C-12 of 2.