versatile synthetic methodology for the construction of tetrazoles and guanidines in the presence of an eco-friendly, inexpensive, easily available iron reagent. Aromatic thioureas with electron-donating substituents produced their respective target products in quantitative yield. In contrast, when electron-withdrawing substituted aromatic thioureas were used, the expected products were obtained in reduced
<i>tert</i>-Butyl nitrite-mediated radical cyclization of tetrazole amines and alkynes toward tetrazolo[1,5-<i>a</i>]quinolines
作者:Teng Liu、Yi-Gang Ji、Lei Wu
DOI:10.1039/c9ob00169g
日期:——
A general and efficient radical cyclization of 1H-tetrazol-5-amines and alkynes toward tetrazolo[1,5-a]quinolines is established for the first time. The annulation mediated by tert-butyl nitrite takes place expeditiously within 10 minutes undermildconditions. Without using external additives or excitation, the tetrazolo[1,5-a]quinoline derivatives are obtained in moderate to good yields, along with
首次建立了1 H-四唑-5-胺和炔烃向四唑并[1,5- a ]喹啉的一般有效的自由基环化反应。在温和条件下,亚硝酸叔丁酯介导的环化迅速在10分钟内发生。在不使用外部添加剂或激发的情况下,以中等至良好的产率获得了四唑并[1,5- a ]喹啉衍生物,以及对不对称炔烃的高区域选择性和宽泛的功能耐受性特征。示例性地,该反应经由自由基过程发生,其中由亚硝酸叔丁酯,水和四唑盐-重氮盐协同生成芳基。
Temperature dependent regioselective synthesis of aryl tetrazole amines using copper source
for the construction of aryl tetrazole amines via desulphurization/substitution/electro cyclization/C-N cross coupling reactions from thiourea with the use of cheap, readily available and air stable copper source as catalyst has been described. The reaction proceeds through the in situ formation of amino tetrazole followed by successive C-N cross-coupling reaction with aryl iodide. Further the temperature
<i>Tert</i>-Butyl Nitrite Mediated Expeditious Methylsulfoxidation of Tetrazole-amines with DMSO: Metal-free Synthesis of Antifungal Active Methylsulfinyl-1<i>H</i>-tetrazole Derivatives
A tert‐butyl nitrite mediated methyl‐sulfoxidation of tetrazole‐amines in neat DMSO or methyl‐sulfinyl derivatives is revealed for the first time. The reaction exhibits good group tolerance, as well as highly selectivity to sulfinyl substitutions. This new protocol provides an expeditious and operationally simple procedure for C−S(O) bond construction. Preliminary bioactivity evaluation on selected
AbstractA highly general, efficient and simple methodology for the regioselective synthesis of aryl tetrazole amines has been explored. The present method involves consecutive desulphurization and \(C\hbox -}N\) cross-coupling reaction. Cheap, readily available and air stable cobalt catalyst has been used for this methodology. In addition, the substrate scope has been demonstrated. Graphical AbstractA
摘要已经探索了用于芳基四唑胺的区域选择性合成的高度通用,有效和简单的方法。本方法涉及连续的脱硫和\(C \ hbox -} N \)交叉偶联反应。廉价,易于获得且空气稳定的钴催化剂已用于此方法。另外,已经证明了基板范围。 图形概要已经探索了用于芳基四唑胺的区域选择性合成的高度通用,有效和简单的方法。本方法涉及连续的脱硫和\(C \ hbox -} N \)交叉偶联反应。