The cyclopalladation of highly enantioenriched cyclopentadienyl(indenyl)ruthenium complexes featuring pyridine or oxazoline functionalities as directing groups is detailed. Two competitive metalation sites inherent to the fused ring system were selectively activated after appropriate tuning of the reaction conditions, enabling the access to both six (peri)- and five-membered (ortho) membered chelates
详细介绍了以
吡啶或
恶唑啉官能团为导向基团的高度对映体富集的
环戊二烯基(
茚基)
钌配合物的环palpalation。在适当调节反应条件后,有选择地激活了稠环系统固有的两个竞争性
金属化位点,从而能够同时获得六元(peri)和五元(邻位)螯合物。甲围→邻异构化在基于
吡啶的系统被确定,拉开的动力学偏好迫位和热力学控制的邻-cyclopalladation。与之形成鲜明对比的是,在C4处结合了立体异构中心的
恶唑啉衍
生物被证明不愿形成邻位异构体,并且在低温下仅被转化为相应的邻palladacyles。