Palladium-Catalyzed Arylation of C(sp2)–H Bonds and C(sp3)–H Bonds with 4-Amino-benzotriazole as the Bidentate Directing Group
作者:Chengqian Li、Zhuo Wang、Meina Jin、Zhiguang Song
DOI:10.1021/acs.joc.4c00329
日期:2024.5.17
The arylation of C(sp2)–H and C(sp3)–H bonds in carboxylic acids catalyzed by Pd(II) with 4-aminobentriazole as the directing group was investigated. In addition to activation of the C(sp2)–H bond, selectivearylation of alkyl carboxylic acids and amino acids in the β position can also be achieved. This strategy involved a 5,5-bicyclic Pd intermediate complex whose structure was determined by X-ray
A number of quinolone derivatives have been reported to possess anti-mycobacterial activity. Generally. Mycobacterium tuberculosis isolates expressing resistance to both isoniazid and rifampin are susceptible to fluoroquinolones. Benzotriazole is a hetero-bicyclic aromatic ring endowed with interesting chemical and biological properties and pharmacological activities. In a preliminary study we have recently reported the activity of triazolo[4,5-h]quinolone-carboxylic acids, a new class of benzotriazole derivatives active against multi-drug resistant M. tuberculosis (MDR-Mtb). In this study we confirm that this novel class of quinolones is endowed with a selective anti-mycobacterial activity, coupled with absence of cytotoxicity.The SAR analysis of the new derivatives in comparison with the previous series shows that the methyl group is the most effective substituent in both N-3 and N-9 positions of the ring system. (C) 2010 Elsevier Masson SAS. All rights reserved.