Rh(III)-Catalyzed Regioselective Synthesis of Pyridines from Alkenes and α,β-Unsaturated Oxime Esters
作者:Jamie M. Neely、Tomislav Rovis
DOI:10.1021/ja3104389
日期:2013.1.9
O-pivaloyl oximes are coupled to alkenes by Rh(III) catalysis to afford substituted pyridines. The reaction with activated alkenes is exceptionally regioselective and high-yielding. Mechanistic studies suggest that heterocycle formation proceeds via reversible C-H activation, alkene insertion, and a C-N bond formation/N-O bond cleavage process.
α,β-不饱和的 O-新戊酰基肟通过 Rh(III) 催化与烯烃偶联,得到取代的吡啶。与活化烯烃的反应具有异常的区域选择性和高产率。机理研究表明,杂环的形成是通过可逆的 CH 活化、烯烃插入和 CN 键形成/NO 键裂解过程进行的。