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.
[EN] REAGENTS AND PROCESS FOR DIRECT C-H FUNCTIONALIZATION<br/>[FR] RÉACTIFS ET PROCÉDÉ POUR LA FONCTIONNALISATION DIRECTE DE LA LIAISON C-H
申请人:STUDIENGESELLSCHAFT KOHLE MBH
公开号:WO2020094673A1
公开(公告)日:2020-05-14
Thianthrene derivative of the Formula (I): wherein R1 to R8 may be the same or different and are selected from hydrogen, Cl, F, a partially or fully fluorinated C1 to C6 alkyl group, and wherein n is 0 or 1, with the proviso that at least one of R1 to R8 is not hydrogen and process for C-H functionalization of aromatic compounds using this compound.
Palladium-Catalyzed Oxidative Double CH Functionalization/Carbonylation for the Synthesis of Xanthones
作者:Hua Zhang、Renyi Shi、Pei Gan、Chao Liu、Anxing Ding、Qiuyi Wang、Aiwen Lei
DOI:10.1002/anie.201201050
日期:2012.5.21
Two at once: Xanthones with different functional groups were obtained with CO (balloon) in the presence of a simple catalytic system that consists of Pd(OAc)2, K2S2O8, and trifluoroacetic acid (see scheme). Preliminary mechanism studies reveal that the second CHfunctionalization might be the rate‐determining step.
一次两个:在简单的催化体系(由Pd(OAc)2,K 2 S 2 O 8和三氟乙酸组成)的存在下,用CO(气球)获得具有不同官能团的氧杂蒽。初步的机理研究表明,第二个CH功能化可能是决定速率的步骤。
One-Pot Synthesis of Xanthones and Thioxanthones by the Tandem Coupling−Cyclization of Arynes and Salicylates
作者:Jian Zhao、Richard C. Larock
DOI:10.1021/ol0517731
日期:2005.9.1
[reaction: see text] The reaction of silylaryl triflates, CsF, and salicylates affords a general and efficient way to prepare biologically interesting xanthones and thioxanthones. This chemistry presumably proceeds by a tandem intermolecular nucleophilic coupling and subsequent intramolecular electrophilic cyclization.
Abstract An efficient synthetic method for multi-substituted xanthones was developed. The reaction of diaryliodonium salts and salicylates was employed for the preparation of the xanthones. This method proceeded through an intermolecular etherification-acylation to give target heterocycles in good yields (up to 91%). Multi-substituted xanthones were gained by shifting the substituent of salicylates or