Tuberculosis continues to be a great source of concern in global health because of the large reservoir of humans infected with the bacilli and the appearance of clinical isolates resistant to a wide array of anti-tuberculosis drugs. New drugs with novel mechanisms of action on new targets are urgently required to reduce global tuberculosis burden. Mycobacterium tuberculosis nucleoid associated protein (NAP) HU has been shown to be druggable and essential for the organism’s survival. In this study, four diarylethenes were synthesized using a one-pot decarboxylated Heck-coupling of coumaric acids with iodoanisoles. The prepared compounds 1–4 were tested for their in vitro growth inhibition of M. tuberculosis H37Rv using the spot culture growth inhibition assay, displaying minimum inhibitory concentrations between 9 and 22 µM. Their cytotoxicity against BHK-21 cell line showed half inhibition at concentrations between 98 and 729 µM. The most selective hit (SI = 81), demonstrated inhibition of M. tuberculosis HU protein involved in maintaining bacterial genome architecture.
结核病仍然是全球健康的一大关注点,这是由于感染了杆菌的人类储存量大,以及出现了对多种抗结核药物临床分离株产生耐药性。迫切需要开发作用机制新颖、针对新目标的新药,以减轻全球结核病负担。结核分枝杆菌核小体相关蛋白(NAP)HU已被证明具有成药性,对生物体的生存至关重要。在本研究中,采用一步脱羧 Heck 偶联反应合成了 4 种二芳基乙烯类化合物,用碘氧化的茴香醚与香豆酸。制备的化合物 1-4 通过点状培养生长抑制试验测试了它们对 M. tuberculosis H37Rv 的体外生长抑制作用,显示出最低抑制浓度在 9 至 22 µM 之间。它们对 BHK-21 细胞系的细胞毒性显示半数抑制浓度在 98 至 729 µM 之间。最具选择性的命中(SI = 81)表现出对涉及维持细菌基因组结构的 M. tuberculosis HU 蛋白的抑制作用。
Late‐Stage Direct
<i>o</i>
‐Alkenylation of Phenols by Pd
<sup>II</sup>
‐Catalyzed C−H Functionalization
phenol as a directing group, high regioselectivity, good substrate scope, mild reaction conditions, and high efficiency. To the best of our knowledge, this is the first example of a regioselective C−H alkenylation of unprotected phenols utilizing phenolic hydroxyl group as a directing group. The alkenylation of unprotected tyrosine and intramolecular cyclization are also successfully carried out under
Rhodium-Catalyzed Asymmetric Addition of Organoboronic Acids to Aldimines Using Chiral Spiro Monophosphite-Olefin Ligands: Method Development and Mechanistic Studies
作者:Huanyu Shan、Qiaoxia Zhou、Jinglu Yu、Shuoqing Zhang、Xin Hong、Xufeng Lin
DOI:10.1021/acs.joc.8b01764
日期:2018.10.5
on a hexamethyl-1,1′-spirobiindane scaffold was accomplished starting from Bisphenol C. The optimal ligand could serve as an elegant chiral bidentate ligand in the Rh-catalyzed asymmetric 1,2-addition of organoboronic acids to various acyclic/cyclic aldimines, leading to chiral amines with high yields and excellent enantioselectivities. Detailed stereochemical models for enantioselective induction
protocols for Wittigreaction and palladium-catalyzed Heck coupling give expedient access to a series of unprecedented polyfunctionalized artificial-resveratrol derivatives. In the modified Wittig protocol, trimethylsilyl was used as a highly valuable protective group of the phenolic functions of starting aromatic materials. A clean O-alkylation of hydroxylated stilbenes with ethylene carbonate was
Hypervalent Iodine(III)-Catalyzed Synthesis of 2-Arylbenzofurans
作者:Fateh Singh、Saeesh Mangaonkar
DOI:10.1055/s-0037-1610650
日期:2018.12
route for the synthesis of 2-arylbenzofurans is described by iodine(III)-catalyzed oxidative cyclization of 2-hydroxystilbenes using 10 mol% (diacetoxyiodo)benzene [PhI(OAc)2] as catalyst in the presence of m-chloroperbenzoic acid. The 2-arylbenzofurans were isolated in good to excellent yields. An alternative route for the synthesis of 2-arylbenzofurans is described by iodine(III)-catalyzed oxidative