Preparation of 2-Azido-1-Substituted-1 <i>H</i>-Benzo[<i>d</i>]imidazoles Using a Copper-Promoted Three-Component Reaction and Their Further Conversion into 2-Amino and 2-Triazolyl Derivatives
作者:Tamminana Ramana、Tharmalingam Punniyamurthy
DOI:10.1002/chem.201202215
日期:2012.10.15
Multicomponent reaction: 2‐Azido‐1‐substituted‐1H‐benzo[d]imidazoles were prepared using a copper‐catalyzed three‐component reaction involving 2‐bromoaniline derivatives, isothiocyanates, and sodium azide. The reaction conditions were mild and the scope was broad. The azido compounds were transformed into their 2‐amino and 2‐triazolyl derivatives using copper‐mediated reduction and cycloaddition, respectively
多组分反应:使用2-铜苯胺衍生物,异硫氰酸盐和叠氮化钠的铜催化三组分反应制备2-叠氮基-1-取代-1 H-苯并[ d ]咪唑。反应条件温和,适用范围广。分别通过铜介导的还原和环加成将叠氮基化合物转化为它们的2-氨基和2-三唑基衍生物(参见方案)。
Room-Temperature Cu(II)-Catalyzed Chemo- and Regioselective <i>Ortho</i>-Nitration of Arenes via C–H Functionalization
compatibility. The procedure features the use of operationally simple protocol utilizing the commercially available less toxic CuCl2·2H2O as catalyst and Fe(NO3)3·9H2O as nitration source at room temperature. Removal of the 5-aminotetrazole directing group has been demonstrated using base hydrolysis to afford substituted 2-nitroanilines.
A Pd(II)-catalyzed ortho-selective halogenation of N-aryl ring of N,1-diaryl-1H-tetrazol-5-amine has been described employing N-halosuccinimide as a halogen source viaC–H bond activation. The present work features 5-aminotetrazole, as a directing group, for the chemo- and regioselectiveC–H halogenation of arenes. The kinetic isotope study (kH/kD = 2.9) suggests that the cleavage of the C–H bond takes
N,1-二芳基-1 H-四唑-5-胺的N-芳基环的Pd(II)催化邻位选择性卤化已通过N-卤代琥珀酰亚胺通过CH键进行卤素活化。目前的工作以5-氨基四唑为导向基团,用于芳烃的化学和区域选择性CH卤代。动力学同位素研究(k H / k D = 2.9)表明,CH键的裂解发生在速率确定步骤中。该协议的范围和机制已得到证明。
Metal free synthesis of substituted 5-aryl/alkyl aminotetrazoles in water
作者:Venkata Hema Kumar、Sannapaneni Janardan、Ramana Tamminana
DOI:10.1016/j.tetlet.2023.154599
日期:2023.7
The synthesis of tetrazoles is established under metal free conditions at room temperature in the presence of open air. The reaction of 2-bromoaryl isothiocyantes with amines gives thiourea that undergoes reaction in situ with NaN3 using Iodine in the presence of water medium to afford 1-(2-bromophenyl)-N-5-arylaminotetrazoles via substitution followed by electrocyclization processes at ambient temperature
四唑的合成是在室温、露天存在的无金属条件下进行的。2-溴芳基异硫氰酸酯与胺反应生成硫脲,硫脲在水介质存在下使用碘与 NaN 3 进行原位反应,通过取代得到1- (2-溴苯基)-N -5-芳基氨基四唑,然后在环境温度下进行电环化过程温度。所有给电子和吸电子取代基都很容易发生反应,得到相应的最终产物2a–2ab产量中等至良好。该方法也适用于克级数量的四唑。此外,我们的水性胶束介质表现出良好的可回收活性,并且在最多四个循环中表现出良好的产品收率。