Results 31 to 40 of about 4,197 (216)
Synthesis of γ‑Pyrones from Formal [4 + 2] Cyclization of Ketene Dithioacetals with Acyl Chlorides [PDF]
, 2019 A formal [4 + 2] cyclization of easily available ketene dithioacetals with acyl chlorides has been developed. Mediated by lithium bis(trimethylsilyl)amide, a series of γ-pyrones were obtained with a broad substrate scope. This unprecedented formal [4 +
Yifei Li (198040) +4 more
core +3 more sources
Journal of Fungi, 2023 Fusarium graminearum is a causal organism of Fusarium head blight in cereals and maize. Although a few secondary metabolites produced by F. graminearum are considered disease virulence factors, many molecular products of biosynthetic gene clusters ...
Carmen Hicks +9 more
doaj +1 more source
Facile Synthesis, Fluorescence, and Photochromism of Novel Helical Pyrones and Chromenes [PDF]
, 2016 Aryl coumaryl ethylenes undergo oxidative photocyclization readily to yield helical pyrone-annulated condensed aromatics. The pyrones are conveniently converted to the corresponding photochromic diphenylpyrans/chromenes.
Sanchita Sengupta (1776892) +3 more
core +3 more sources
SynOpen, 2017 Pd/C was found to be an efficient and convenient metal catalyst for intramolecular C–H arylation reactions in the synthesis of phenanthridinones and dibenzo-α-pyrones. A variety of phenanthridinones and dibenzo-α-pyrones were synthesized under the highly
Lingyu Zhao +4 more
doaj +1 more source
Étude théorique des pyrones 2 et 4 [PDF]
, 2017 Les molécules de pyrones 2 et 4 sont étudiées par deux types de méthode LCAOMO, l'une tenant compte uniquement des électrons π et l'autre des électrons π et σ. Avec la méthode LCAO améliorée de JULG, le calcul conduit à des résultats en bon accord avec l'
Jean-Claude Bery +2 more
core +1 more source
Convergent Total Synthesis of 16β‐Hydroxylpseudobufarenogin
Angewandte Chemie, Volume 138, Issue 23, 1 June 2026.We present a novel convergent strategy that integrates Pd/Ag‐promoted Suzuki–Miyaura coupling with Ir‐catalyzed radical‐relay cyclization, enabling the first total synthesis of 16β‐hydroxylpseudobufarenogin. This approach is broadly applicable to the total synthesis of various oxygenated bufadienolides by simply modifying the fragment structures ...
Wataru Shigematsu +3 more
wiley +2 more sources
Marine Drugs, 2019 Three novel monomeric naphtho-γ-pyrones, peninaphones A−C (compounds 1−3), along with two known bis-naphtho-γ-pyrones (compounds 4 and 5) were isolated from mangrove rhizosphere soil-derived fungus Penicillium sp. HK1-22.
Yao-Yao Zheng +7 more
doaj +1 more source
Green Synthesis and Catalysis, 2020 Salicylaldehyde containing biaryls are efficiently synthesized via an unprecedented amine promoted Diels-Alder-retro-Diels-Alder cascade reaction of ynals with 2-pyrones in good yields.
Xixi Song +5 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2019 Starting from substituted alkynones, α-pyrones and/or 1H-pyridines were generated in a Michael addition–cyclocondensation with ethyl cyanoacetate. The peculiar product formation depends on the reaction conditions as well as on the electronic substitution
Natascha Breuer +3 more
doaj +1 more source
Nocapyrones: α- and γ-Pyrones from a Marine-Derived Nocardiopsis sp.
Marine Drugs, 2014 One new α-pyrone (nocapyrone R (1)), and three known γ-pyrones (nocapyrones B, H and L (2–4)) were isolated from the culture extract of a Nocardiopsis strain collected from marine sediment.
Youngju Kim +7 more
doaj +1 more source