Palladium catalyzed carbonylative annulation of the C(sp<sup>2</sup>)–H bond of <i>N</i>,1-diaryl-1<i>H</i>-tetrazol-5-amines and <i>N</i>,4-diaryl-4<i>H</i>-triazol-3-amines to quinazolinones
作者:Attoor Chandrasekhar、Venkatachalam Ramkumar、Sethuraman Sankararaman
DOI:10.1039/c8ob02516a
日期:——
as both directing as well as intramolecular nucleophiles. The catalytically active C–H activated intermediate dimeric Pd complex was isolated and characterized which on exposure to CO gas gave the corresponding tetrazole fused quinazolinone derivative. On the basis of isolation of the intermediate and observed kinetic isotope effects, a mechanism has been proposed for the C–H activated direct carbonylative
Pd(II)催化N,1-二芳基-1 H-四唑-5-胺和N,4-二芳基-4 H的直接C–H羰基环化反应-1,2,4-三唑-3-胺以良好的收率得到相应的三唑和四唑稠合的喹唑啉酮。该方法学为在高度原子经济的过程中合成这些重要的杂环骨架提供了一种方便的方法。在机械方面,亲核性的三唑和四唑部分具有弱的亲核性和分子内的亲核性。分离并表征了具有催化活性的CH活化的中间体二聚体Pd配合物,将其暴露于CO气体后得到了相应的四唑稠合喹唑啉酮衍生物。在分离中间同位素和观察到的动力学同位素效应的基础上,有人提出了C–H活化的直接羰基环化反应的机理。