Structure–Activity Relationships of Antitubercular Nitroimidazoles. 3. Exploration of the Linker and Lipophilic Tail of ((S)-2-Nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin-6-yl)-(4-trifluoromethoxybenzyl)amine (6-Amino PA-824).
摘要:
The (S)-2-nitro-6-(4-(trifluoromethoxy)benzyloxy)-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazine named PA-824 (1) has demonstrated antitubercular activity in vitro and in animal models and is currently in clinical trials. We synthesized derivatives at three positions of the 4-(trifluoromethoxy)benzylamino tail, and these were tested for whole-cell activity against both replicating and nonreplicating Mycobacterium tuberculosis (Mtb). In addition, we determined their kinetic parameters as substrates of the deazaflavin-dependent nitroreductase (Ddn) from Mtb that reductively activates these pro-drugs. These studies yielded multiple compounds with 40 nM aerobic whole cell activity and 1.6 mu M anaerobic whole cell activity: 10-fold improvements over both characteristics from the parent molecule. Some of these compounds exhibited enhanced solubility with acceptable stability to microsomal and in vivo metabolism. Analysis of the conformational preferences of these analogues using quantum chemistry suggests a preference for a pseudoequatorial orientation of the linker and lipophilic tail.
Quinazolinones from <i>o</i>
-Aminobenzonitriles by One-Pot Sequential Selective Hydration/Condensation/Acceptorless Dehydrogenation Catalyzed by an Iridium Complex
作者:Wei Zhao、Pengcheng Liu、Feng Li
DOI:10.1002/cctc.201501385
日期:2016.4.20
A new strategy for the direct synthesis of quinazolinones from o‐aminobenzonitriles was proposed and accomplished. In the presence of [Cp*IrCl2]2 (Cp*=pentamethylcyclopentadienyl), a variety of desirable products was obtained easily through the one‐pot sequential selective hydration/condensation/acceptorless dehydrogenation. This protocol is highly attractive because it uses readily available starting
Stable and reusable nanoscale Fe<sub>2</sub>O<sub>3</sub>-catalyzed aerobic oxidation process for the selective synthesis of nitriles and primary amides
作者:Kathiravan Murugesan、Thirusangumurugan Senthamarai、Manzar Sohail、Muhammad Sharif、Narayana V. Kalevaru、Rajenahally V. Jagadeesh
DOI:10.1039/c7gc02627g
日期:——
nitriles and amides from easily available starting materials using cost-effective catalysts and green reagents is highly desired. In this regard, herein we report the nanoscale iron oxide-catalyzed environmentally benign synthesis of nitriles and primary amides from aldehydes and aqueous ammonia in the presence of 1 bar O2 or air. Under mild reaction conditions, this iron-catalyzed aerobic oxidation process
在腈纶或酰胺基团形式的功能化分子中可持续引入氮基是至关重要的,因为在许多生命科学分子,天然产物和材料中都发现了含氮基序。因此,非常需要使用具有成本效益的催化剂和绿色试剂从容易获得的起始原料合成腈和酰胺的方法。就这一点而言,本文报道了在1 bar O 2的存在下,由醛和氨水进行的纳米级氧化铁催化的腈和伯酰胺的环境友好合成。或空气。在温和的反应条件下,该铁催化的需氧氧化过程继续进行,以合成功能化且结构多样的芳族,脂族和杂环腈。另外,应用该铁基方案,还已经在水介质中制备了伯酰胺。
Regioselective functionalization of pyrones: Facile synthesis of 6-styrylpyrones via KHMDS-mediated aldol condensation
作者:Ramakrishna Samala、Manas K. Basu、K. Mukkanti
DOI:10.1016/j.tetlet.2021.153574
日期:2022.1
Herein, we disclose our efforts directed toward the synthesis of the kavalactone-based natural product penstyrylpyrone and other related 4-OMe-2-pyrones possessing diverse substituents at the 3-, 5-, and 7-positions. Further, a facile approach to access 6-styrylpyrones via the KHMDS-mediated regioselective aldol condensation of 2-pyrones is described with moderate substrate scope and good to high yields
在此,我们公开了我们致力于合成基于 kavalactone 的天然产物 penstyrypyrone 和其他相关的 4-OMe-2-pyrones,这些 4-OMe-2-pyrones 在 3-、5-和 7-位具有不同的取代基。此外,描述了一种通过KHMDS 介导的 2-吡喃酮的区域选择性羟醛缩合获得 6-苯乙烯基吡喃酮的简便方法,具有中等底物范围和良好到高产率(58-80%)。这种方法的效用通过去甲氧基仰光素、asnipyrone A 和 asnipyrone B 的立体选择性构建得到了例证。
ENANTIOMERICALLY ENRICHED ARYLOAZOL-2-YL CYANOETHYLAMINO COMPOUNDS, METHOD OF MAKING AND METHOD OF USING THEREOF
申请人:Soll Mark David
公开号:US20100125089A1
公开(公告)日:2010-05-20
The present invention relates to novel aryloazol-2-yl-cyanoethylamino derivatives substantially enriched in an enantiomer of formula (I):
and compounds of formula (IH)
wherein R
3
, R
4
, R
5
, R
6
, R
7
, R
13a
, R
13b
, R
14a
, R
14b
, P, Q, V, W, X, Y, Z and a are as defined in the description, compositions thereof, processes for their preparation and their uses as pesticides.
Design, synthesis, and biological activity evaluation of 2-(benzo[b]thiophen-2-yl)-4-phenyl-4,5-dihydrooxazole derivatives as broad-spectrum antifungal agents
To discover antifungal compounds with broad-spectrum and stable metabolism, a series of 2-(benzo[b]thiophen-2-yl)-4-phenyl-4,5-dihydrooxazole derivatives was designed and synthesized. Compounds A30-A34 exhibited excellent broad-spectrum antifungal activity against Candida albicans with MIC values in the range of 0.03–0.5 μg/mL, and against Cryptococcus neoformans and Aspergillus fumigatus with MIC