A Highly Efficient Heterogeneous Copper-Catalyzed Oxidative Cyclization of Benzylamines and 1,3-Dicarbonyl Compounds To Give Trisubstituted Oxazoles
作者:Li Wei、Shengyong You、Yuxin Tuo、Mingzhong Cai
DOI:10.1055/s-0037-1610710
日期:2019.8
yields. This heterogeneous copper catalyst can be facilely prepared via a simple two-step procedure from readily available and inexpensive reagents and exhibits a slightly higher activity than Cu(OAc)2. MCM-41-2N-Cu(OAc)2 is also easy to recover and can be recycled up to eight times with almost consistent activity. The reaction is the first example of heterogeneous copper-catalyzed intermolecular cyclization
Structure–activity relationship of new anti-tuberculosis agents derived from oxazoline and oxazole benzyl esters
作者:Garrett C. Moraski、Mayland Chang、Adriel Villegas-Estrada、Scott G. Franzblau、Ute Möllmann、Marvin J. Miller
DOI:10.1016/j.ejmech.2009.12.074
日期:2010.5
During the syntheses and studies of natural iron chelators (mycobactins), we serendipitously discovered that a simple, small molecule, oxazoline-containing intermediate 3 displayed surprising anti-tuberculosis activity (MIC of 7.7 μM, average). Herein we report elaboration of SAR around this hit as well as the syntheses and evaluation of a hundred oxazoline- and oxazole-containing compoundsderived from
在天然铁螯合剂(分枝杆菌素)的合成和研究过程中,我们偶然发现一种简单的小分子含恶唑啉中间体3表现出令人惊讶的抗结核活性(平均MIC为7.7 μM)。在此,我们报告了围绕这一打击的 SAR 详细阐述,以及从有效的三步过程衍生的一百种含恶唑啉和恶唑化合物的合成和评估:1)与丝氨酸或苏氨酸形成 β-羟基酰胺; 2)环化得到恶唑啉; 3)脱水得到相应的恶唑。通过这种方法制备的许多化合物显示出具有令人印象深刻的抗结核分枝杆菌活性、极低的毒性和因此高的治疗指数,以及对更顽固的非复制形式的结核分枝杆菌的活性。它们结构的独特性和简单性应该使它们能够进一步优化以满足 ADME(吸收、分布、代谢、排泄)要求。八种最有效的体外化合物的合成得到了扩大,并在小鼠体内感染模型中测试了这些化合物,以评估其功效,然后再进行更精细的化合物设计和优化。
Design, synthesis, and evaluation of oxazole transthyretin amyloidogenesis inhibitors
作者:Hossein Razavi、Evan T. Powers、Hans E. Purkey、Sara L. Adamski-Werner、Kyle P. Chiang、Maria T.A. Dendle、Jeffery W. Kelly
DOI:10.1016/j.bmcl.2004.12.022
日期:2005.2
Ten oxazoles bearing a C(4) carboxyl group were synthesized and evaluated as transthyretin (TTR) amyloid fibril inhibitors. Substituting aryls at the C(2) position of the oxazole ring reveals that a 3,5-dichlorophenyl substituent significantly reduced amyloidogenesis. The efficacy of these inhibitors was enhanced further by installing an ethyl, a propyl, or a CF3 group at the C(5) position. The CF3 substitution at C(5) also improves the TTR binding selectivity over all the other proteins in human blood. (C) 2004 Elsevier Ltd. All rights reserved.
Syntheses of Amamistatin Fragments and Determination of Their HDAC and Antitumor Activity
作者:Kelley A. Fennell、Marvin J. Miller
DOI:10.1021/ol070382e
日期:2007.4.1
Amamistatins A and B are natural products found to have anti-proliferative effects against MCF-7, A549, and MKN45 human tumor cell lines (IC(50) 0.24-0.56 mu M). It was proposed that their activity was due to histone deacetylase (HDAC) inhibition mediated by the N-formyl-N-hydroxy lysine moiety. Amamistatin B fragment analogs were synthesized and screened for biological activity. These compounds were modest HDAC inhibitors and showed antitumor activity against MCF-7 and PC-3 human tumor cells.
Syntheses and Biological Activity of Amamistatin B and Analogs
作者:Kelley A. Fennell、Ute Möllmann、Marvin J. Miller
DOI:10.1021/jo7020532
日期:2008.2.1
Structurally related mycobactins affect the growth of both mycobacterial and human cells through interference with iron chelation. To further probe the biological activity of this class of compounds, the total syntheses of amamistatin B and two analogs were completed, and the synthetic samples were screened for tumor cell growth inhibition, HDAC inhibition, and Mycobacterium tuberculosis growth inhibition