Irradiation of azido carbonyl compounds using UV light (>= 310 nm) produced triplet alkyl nitrenes and aroyl radicals, which resulted in efficient cleavage of single strand DNA at pH 7.0. DNA cleaving ability of azido carbonyl compounds was found to be dependent on its concentration and substituents on its aromatic ring. Further, newly synthesized naphthalene based azido carbonyl compounds showed DNA cleavage ability at longer wavelength of UV light (>= 350 nm) and also binding studies revealed that they bind to ct-DNA by weak intercalation mode. (C) 2012 Elsevier B.V. All rights reserved.
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