Manganese-Catalyzed Oxidative Azidation of Cyclobutanols: Regiospecific Synthesis of Alkyl Azides by CC Bond Cleavage
作者:Rongguo Ren、Huijun Zhao、Leitao Huan、Chen Zhu
DOI:10.1002/anie.201506578
日期:2015.10.19
azidation of cyclobutanols is described. A wide range of primary, secondary, and tertiary alkyl azides were generated in synthetically useful yields and exclusive regioselectivity. Aside from linear alkyl azides, otherwise elusive medium‐sized cyclicazides were also readily prepared. Preliminary mechanistic studies reveal that the reaction likely proceeds by a radical‐mediated CC bond cleavage/CN3 bond
描述了一种新型的锰催化的环丁醇的氧化叠氮化。产生了大量伯,仲和叔烷基叠氮化物,具有合成上有用的产率和唯一的区域选择性。除了线性烷基叠氮化物外,还容易制备难以捉摸的中型环状叠氮化物。初步机理研究表明,该反应可能是由自由基介导的C转入 C键裂解/ C Ñ 3键的形成通路。
Manganese‐Mediated Electrooxidative Ring‐Opening Azidation of Cyclobutanol Derivatives with TMSN3
作者:Wen‐Chao Gao、Jie Yang、Yong Teng、Wen‐Dian Li、Wen‐Guang Li、Ting Li
DOI:10.1002/adsc.202400101
日期:2024.6.10
A Mn‐electrocatalytic ring‐opening azidation of tert‐cyclobutanols has been developed. The regioselective method is applicable for the azidation of a diverse array of cyclobutanols to provide γ‐azido ketones in 23‐91% yields under chemical oxidants‐free reaction conditions. Detailed mechanistic studies suggest the process of Mn‐mediated alkoxy radical generation followed by β‐scission to form carbon‐centered
Discovery of selective imidazole-based inhibitors of mammalian 15-lipoxygenase: Highly potent against human enzyme within a cellular environment
作者:David S. Weinstein、Wen Liu、Khehyong Ngu、Charles Langevine、Donald W. Combs、Shaobin Zhuang、Cindy Chen、Cort S. Madsen、Timothy W. Harper、Jeffrey A. Robl
DOI:10.1016/j.bmcl.2007.07.011
日期:2007.9
A series of 2,4,5-tri-substituted imidazoles has proven to be highly potent in inhibiting mammalian 15-lipoxygenase (15LO) with excellent selectivity over human isozymes 5- and P-12-LO. Non-symmetrical sulfamides (e.g., 21a-n) were found to be suitable replacements for the earlier arylsulfonamide-containing members of this series (e.g., 2, 14a-p). Several members of these series also demonstrated potent inhibition of human 15-LO in a cell-based assay. (c) 2007 Elsevier Ltd. All rights reserved.
Benzenesulfonamide Derivatives as Calcium/Calmodulin-Dependent Protein Kinase Inhibitors and Antiviral Agents against Dengue and Zika Virus Infections
作者:Wei-Chia Chen、Yogy Simanjuntak、Li-Wei Chu、Yueh-Hsin Ping、Yi-Ling Lee、Yi-Ling Lin、Wen-Shan Li
DOI:10.1021/acs.jmedchem.9b01779
日期:2020.2.13
Emerging and resurging mosquito-borne flaviviruses are an important public health challenge. The increased prevalence of dengue virus (DENY) infection has had a significant socioeconomic impact on epidemic countries. The recent outbreak of Zika virus (ZIKV) has created an international public health emergency because ZIKV infection has been linked to congenital defects and Guillain-Barre syndrome. To develop potentially prophylactic antiviral drugs for combating these acute infectious diseases, we have targeted the host calcium/calmodulin-dependent kinase II (CaMKII) for inhibition. By using CaMKII structure-guided inhibitor design, we generated four families of benzenesulfonamide (BSA) derivatives for SAR analysis. Among these substances, N-(4-cyclohepty1-4-oxobuty1)-4-methoxy-N-phenylbenzenesulfonamide (9) showed superior properties as a lead CaMKII inhibitor and antiviral agent. BSA 9 inhibited CaMKII activity with an IC50 value of 0.79 mu M and displayed EC50 values of 1.52 mu M and 1.91 mu M against DENY and ZIKV infections of human neuronal BE(2)C cells, respectively. Notably, 9 significantly reduced the viremia level and increased animal survival time in mouse-challenge models.