Ru(II)-Catalyzed Selective C–H Amination of Xanthones and Chromones with Sulfonyl Azides: Synthesis and Anticancer Evaluation
作者:Youngmi Shin、Sangil Han、Umasankar De、Jihye Park、Satyasheel Sharma、Neeraj Kumar Mishra、Eui-Kyung Lee、Youngil Lee、Hyung Sik Kim、In Su Kim
DOI:10.1021/jo501709f
日期:2014.10.3
ruthenium-catalyzed selective amination of xanthones and chromones C–H bonds with sulfonyl azides is described. The reactions proceed efficiently with a broad range of substrates with excellent functional group compatibility. This protocol provides direct access to 1-aminoxanthones, 5-aminochromones, and 5-aminoflavonoid derivatives known to exhibit potent anticancer activity.
Chemoselective Hydrosilylation of the α,β-Site Double Bond in α,β- and α,β,γ,δ-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol
作者:Xiao-Yu Zhan、Hua Zhang、Yu Dong、Jian Yang、Shuai He、Zhi-Chuan Shi、Lei Tang、Ji-Yu Wang
DOI:10.1021/acs.joc.0c00568
日期:2020.5.15
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies
Synthesis and antitumor activity of novel dithiocarbamate substituted chromones
作者:Wei Huang、Yu Ding、Yan Miao、Ming-Zhen Liu、Yan Li、Guang-Fu Yang
DOI:10.1016/j.ejmech.2009.04.004
日期:2009.9
A series of chromone derivatives bearing diverse dithiocarbamate moieties were designed and synthesized via a three-component reaction protocol. Their in vitro antitumor activities were evaluated by MTT method against HCCLM-7, Hela, MDA-MB-435S, SW-480, Hep-2 and MCF-7. Two compounds (3-chloro-4-oxo-4H-chromen-2-yl)methyl piperidine-1-carbodithioate (Iq) and (6-chloro-4-oxo-4H-chromen-3-yl)methyl
The synthesis of 3-(1H-imidazol-1-yl)-4H-1-benzopyran-4-ones 2 and of 2-(1H-imidazol-1-yl)-4H-1-benzopyr-an-4-ones 11 are described. The former proceeds through chromanring closure from 2-(1H-imidazol-1-yl)-2′-hydroxyacetophenones, the latter occurs reacting 3-bromo-4H-1-benzopyran-4-ones with imidazole and represents an example of a new synthesis of 2-heteroarylchromones. Compounds 2 can be easily
3-(1 H-咪唑-1-基)-4 H -1-苯并吡喃-4-酮2和2-(1 H-咪唑-1-基)-4 H -1-苯并吡喃-an的合成-4-一11被描述。前者通过2-(1 H-咪唑-1-基)-2'-羟基苯乙酮的苯并二氢吡喃环封闭而进行,后者发生的是使3-溴-4 H -1-苯并吡喃-4-酮与咪唑反应,这是一个例子。 2-杂芳基色酮的新合成方法。化合物2可以很容易地还原为先前在第1部分中描述的相应的苯并二氢吡喃酮和苯并二氢吡喃醇。
Stille coupling for the synthesis of isoflavones by a reusable palladium catalyst in water
Isoflavones were synthesized from the reaction of 3‐bromochromone derivatives and aryltributylstannanes via Stillecoupling catalyzed by a water‐soluble and reusable PdCl2(NH3)2/2,2′‐cationic bipyridyl system in aqueous solution. For prototype 3‐bromochromone, the coupling reaction was performed at 80°C for 24 hr with 2.5 mol% catalyst in water in the presence of tetrabutylammonium fluoride. After