作者:Mingyang Li、Yong Ye
DOI:10.1002/cctc.201500575
日期:2015.12
is important for new compound synthesis, but usually needs special reagents and harsh conditions. With the aid of an azo directing group, the palladium‐catalyzed ortho‐sp2 C−H bond activation of azoarenes with hydrazines has been explored. In the reaction, the Pd catalyst reacts with azobenzene to form a palladacyclic intermediate, which reacts with a phenyl radical generated from phenylhydrazine under
过渡金属催化的CH键的直接官能化对于新化合物的合成很重要,但通常需要特殊的试剂和苛刻的条件。在偶氮导向基团的帮助下,已探索了偶氮芳烃与肼的钯催化邻位sp 2 C-H键活化作用。在该反应中,Pd催化剂与偶氮苯反应形成四环环中间体,该中间体在加热和氧气作用下与苯肼生成的苯基自由基反应,生成Pd IV或Pd III中间体。这终于发生还原消除给予邻-arylated产品与钯释放II催化剂。该反应在温和条件下以高收率提供了新颖的邻芳基偶氮芳烃的途径。