Results 181 to 190 of about 12,444 (248)

Chromones: Privileged scaffold in anticancer drug discovery

Chemical Biology and Drug Design, 2021
In the design and discovery of anticancer drugs, various natural heterocyclic scaffolds have attracted considerable interest as privileged structures.
V. Patil, N. Masand, Saroj Verma, V. Masand   +3 more
semanticscholar   +1 more source

Combining Enzyme and Photoredox Catalysis for the Construction of 3-Aminoalkyl Chromones.

Journal of Organic Chemistry, 2022
Herein, we reported a practical and efficient strategy combining photoredox and enzyme catalysis for the construction of 3-aminoalkyl chromones from o-hydroxyaryl enaminones and N-arylglycine esters.
Jia-Yu Hu, Zongbo Xie, Juan Tang, Zhang-Gao Le, Zhi-Qiang Zhu   +4 more
semanticscholar   +1 more source

Synthesis of 3-SCF2H-/3-SCF3-chromones via Interrupted Pummerer Reaction/Intramolecular Cyclization Mediated by Difluoromethyl or Trifluoromethyl Sulfoxide and Tf2O.

Organic Letters, 2022
The reaction of alkynyl aryl ketones bearing an o-methoxy group with difluoromethyl sulfoxide in the presence of Tf2O was found to conveniently afford the corresponding 3-SCF2H-substituted chromones.
Xuemin Li, Yue Li, Jingyue Yang, Haofeng Shi, Zhenkang Ai, C. Han, Jiaxin He, Yunfei Du   +7 more
semanticscholar   +1 more source

Photodimerization of chromone

Chemical Communications, 2009
Irradiation of the simple chromone (benzo-gamma-pyrone) resulted in the formation of two types of dimers, anti-HT (head-to-tail) and trans-fused HT isomers, whose structures were established by X-ray structural analysis.
Masami, Sakamoto, Masayuki, Kanehiro, Takashi, Mino, Tsutomu, Fujita   +3 more
openaire   +2 more sources

Domino Reactions of Chromones with Heterocyclic Enamines

Synlett : Accounts and Rapid Communications in Synthetic Organic Chemistry, 2021
Domino reactions of heterocyclic enamines with chromone derivatives provides a convenient synthesis of a great variety of annulated heterocyclic ring systems.
P. Langer
semanticscholar   +1 more source

The Domino Chromone Annulation and a Transient Halogenation-Mediated C-H Alkenylation toward 3-Vinyl Chromones.

Organic Letters, 2020
Reported in this paper is a step economical method toward the general synthesis of 3-vinyl chromones via the reactions between readily available o-hydroxyphenyl enaminones and various alkenes.
L. Fu, Zhong-Yuan Xu, Jie‐Ping Wan, Yunyun Liu   +3 more
semanticscholar   +1 more source

Recent Advances in the Assembly of Organoselenyl‐Substituted (Thio)Chromones and 4‐Quinolones

Advanced Synthesis & Catalysis
Organoselenylated chromones, thiochromones, and 4‐quinolones, as an important members of selenyl‐bearing heterocycles, present significant biological activities.
Jinhui Cai, Zhouting Zeng, Qiaolin Wang, Weishuang Li   +3 more
semanticscholar   +1 more source

Energetics of Coumarin and Chromone

The Journal of Physical Chemistry B, 2009
Condensed phase standard (p degrees = 0.1 MPa) molar enthalpies of formation for coumarin and chromone were derived from the standard molar enthalpies of combustion, in oxygen, at T = 298.15 K, measured by static bomb combustion calorimetry. The standard molar enthalpies of sublimation, at T = 298.15 K, were measured by Calvet microcalorimetry ...
Matos, M. Agostinha R., Sousa, Clara C.S., Miranda, Margarida S., Morais, Victor M.F., Liebman, Joel F.   +4 more
openaire   +3 more sources

ChemInform Abstract: EINE EINFACHE SYNTHESE VON CHROMON‐3‐ALDEHYD, CHROMON‐3‐CARBONSAEURE UND 3‐HYDROXYMETHYL‐CHROMON

Chemischer Informationsdienst, 1973
AbstractAus den 2‐Hydroxy‐acetophenonen (I) erhält man mit Vilsmeier‐Reagens die Chromon‐3‐aldehyde (II), die nach Jones zu den Carbonsäuren (III) oxidiert werden.
A. NOHARA, T. UMETANI, Y. SANNO
openaire   +1 more source

Divergent Synthesis of 2-Chromonyl-3-hydrazono-chromones and 2-Alkoxy-3-hydrazono-chromones through Switchable Annulation Reactions of o-Hydroxyphenylenaminones with Aryldiazonium Salts.

Organic Letters
An unprecedented selective chromone annulation reaction controlled by solvent for the divergent synthesis of two types of 2,3-disubstituted chromone skeletons has been developed.
Siyu Song, Menglin Peng, Zhilai Zhang, Huimin Hu, Yuanzheng Wei, Shengqing Yan, Yongchao Wang, Fuchao Yu   +7 more
semanticscholar   +1 more source