Organocatalytic Selective [3 + 2] Cycloadditions: Synthesis of Functionalized 5-Arylthiomethyl-1,2,3-triazoles and 4-Arylthio-1,2,3-triazoles
作者:G. Surendra Reddy、L. Mallikarjuna Reddy、A. Suresh Kumar、Dhevalapally B. Ramachary
DOI:10.1021/acs.joc.0c02247
日期:2020.12.4
respectively, in a regioselective manner with high yields/rates. With controlled and online NMR experiments, we proved that the reaction path is following the organocatalytic enolization through selective deprotonation followed by a [1,3]-H shift. Surprisingly, the [3 + 2] cycloaddition of aryl/vinyl/alkyl azides with the in situ-generated equilibrated thermodynamic ↔ kinetic enolates furnished the highly
各种1-芳基-3-(芳硫基)丙烷-2-酮和1-烷基-3-(芳硫基)丙烷-2-酮与不同芳基的有机催化叠氮化物-酮[3 + 2]环加成(OrgAKC)据报道,在环境条件下,/乙烯基/烷基叠氮化物可提供具有医学重要性的1,4-二取代-5-芳硫基甲基1,2,3-三唑和1,5-二取代-4-芳硫基1,2,3-三唑分别以区域选择性的方式以高产率/速率。通过受控和在线NMR实验,我们证明了反应路径遵循有机催化烯化反应,该反应通过选择性去质子化,然后发生[1,3] -H位移。令人惊讶的是,原位芳基/乙烯基/烷基叠氮化物的[3 + 2]环加成反应生成的平衡热力学dynamic动力学烯醇化物通过区分它们的反应性而提供了高度区域选择性的功能丰富的1,2,3-三唑。这是有关用不对称羰基化合物原位生成的烯醇类区域异构体研究选择性OrgAKC的第一份报告。通过一些受控实验,机理研究和应用来说明反应的可持续性。