The synthesis of cyanamides and tetrazoles from isothiocyanates through tandem reaction using cobalt catalyst has been demonstrated. In the case of tetrazole preparation, the reaction involved addition/desulfurization/nucleophilic addition/electrocyclization, whereas aromatic cyanamides were constructed from isothiocyanates through addition/desulfurization. Cheap cobalt sulfate was used for the synthesis
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
Ultrasound irradiation and green synthesized CuO-NiO-ZnO mixed metal oxide: An efficient sono/nano-catalytic system toward a regioselective synthesis of 1-aryl-5-amino-1<i>H</i>-tetrazoles
作者:Monireh Atarod、Javad Safari、Hamid Tebyanian
DOI:10.1080/00397911.2020.1761396
日期:2020.7.2
N-arylcyanamides and sodium azide using sono/nano-catalytic system. The mixed metal oxide nanoparticles (NPs) (CuO, NiO, and ZnO NPs) were prepared with utilizing aqueous leaves extracts of the Rheum ribes. In this study, the effect of the reaction condition was investigated on the catalytic activity and selectivity of mixed metal oxide NPs for the synthesis of aminotetrazole derivatives. In this regard, various