A Biphilic Phosphetane Catalyzes N–N Bond-Forming Cadogan Heterocyclization via P<sup>III</sup>/P<sup>V</sup>═O Redox Cycling
作者:Trevor V. Nykaza、Tyler S. Harrison、Avipsa Ghosh、Rachel A. Putnik、Alexander T. Radosevich
DOI:10.1021/jacs.7b03260
日期:2017.5.24
chemoselective catalytic synthesis of 2H-indazoles, 2H-benzotriazoles, and related fused heterocyclic systems with good functional group compatibility. On the basis of both stoichiometric and catalytic mechanistic experiments, the reaction is proposed to proceed via catalytic PIII/PV═O cycling, where DFT modeling suggests a turnover-limiting (3+1) cheletropic addition between the phosphetane catalyst and nitroarene
发现小环磷环 1,2,2,3,4,4-六甲基膦烷在氢硅烷末端还原剂存在下催化邻硝基苯扎二亚胺、邻硝基偶氮苯和相关底物的脱氧 NN 键形成 Cadogan 杂环化. 该反应提供了具有良好官能团兼容性的 2H-吲唑、2H-苯并三唑和相关稠合杂环系统的化学选择性催化合成。在化学计量和催化机理实验的基础上,该反应被提议通过催化 PIII/PV=O 循环进行,其中 DFT 模型表明磷烷催化剂和硝基芳烃底物之间存在限制周转的 (3+1) 螯合加成。