Controlling Pd-Catalyzed N-Arylation and Dimroth Rearrangement in the Synthesis of <i>N</i>,1-Diaryl-1<i>H</i>-tetrazol-5-amines
作者:Andrea M. Nikolić、Jelena Stanić、Matija Zlatar、Maja Gruden、Boban And̵elković、Života Selaković、Vladimir Ajdačić、Igor M. Opsenica
DOI:10.1021/acs.joc.1c00282
日期:2021.3.19
thermodynamic stability of the compounds. It was established that the Dimroth rearrangement is thermodynamically controlled, and the equilibrium of the reaction is determined by the stability of the corresponding isomers. The mechanism was investigated by additional DFT calculations, and the opening of the tetrazole ring was shown to be the rate-determining step. By maneuvering Pd-catalyzed N-arylation and the
报道了钯催化的N-芳基化方法,用于合成十八种N,1-二芳基-1H-四唑-5-胺衍生物。通过在35°C下进行反应,由于不希望的Dimroth重排被完全抑制,因此将化合物分离为单一异构体。此外,N,1-二芳基-1 H的Dimroth重排通过进行全面的实验和NMR分析以及化合物的热力学稳定性的密度泛函理论(DFT)计算,对-tetrazol-5-amines进行了合理化处理。已经确定,Dimroth重排是热力学控制的,反应的平衡由相应异构体的稳定性决定。通过额外的DFT计算研究了该机理,并且表明四唑环的打开是决定速率的步骤。通过操纵Pd催化的N-芳基化反应和随后的Dimroth重排,获得了另外两个N,1-二芳基-1 H-四唑-5-胺衍生物,否则不能通过C-N交叉偶联反应合成。