Ligand-Controlled Highly Regioselective and Asymmetric Hydrogenation of Quinoxalines Catalyzed by Ruthenium N-Heterocyclic Carbene Complexes
作者:Slawomir Urban、Nuria Ortega、Frank Glorius
DOI:10.1002/anie.201100008
日期:2011.4.11
Inflating flat bicycles: Proper choice of the N‐heterocyclic carbene (NHC) ligand in Ru NHC complexes allows the completely regioselective ligand‐controlled hydrogenation of either the heterocyclic or the carbocyclic ring of a substituted quinoxaline in quantitative yields. Chiral NHC ligands allow the challenging asymmetric hydrogenation of the carbocyclic ring of quinoxalines, yielding enantioenriched
充气平底自行车:在Ru NHC络合物中正确选择N-杂环卡宾(NHC)配体可实现定量产率的取代喹喔啉杂环或碳环的完全区域选择性配体控制的氢化。手性NHC配体允许对喹喔啉的碳环进行具有挑战性的不对称加氢反应,产生对映体富集的5,6,7,8-四氢喹喔啉,对映体比例高达94:6。