as the catalyst and Cu(NO3)2·3H2O as the nitro source, a wide spectrum of arenes bearing diversified N-heterocycles or oximido as the directing groups were nitrated with meta-selectivity exclusively. Mechanism studies have demonstrated the formation of a new 18e-octahedral ruthenium species as a key ortho-CAr-H metalated intermediate, which may be responsible for the subsequent meta-selective electrophilic
描述了过渡
金属催化
芳烃间位选择性 CAr-H 硝化的第一个例子。以Ru3(CO)12为催化剂,以Cu(
NO3)2·3H2O为硝基源,以间位选择性专门硝化了具有多种N-杂环或
肟基作为导向基团的广谱
芳烃。机理研究表明,形成了一种新的 18e-八面体
钌物质作为关键的邻位 CAr-H
金属化中间体,这可能是随后的间选择性亲电芳香取代 (
SEAr) 的原因。此外,这种方法为许多有用的药物分子的原子/分步经济合成提供了快速通道策略。