Chiral pyridine imidazolines from C1-symmetric diamines: Synthesis, arene ruthenium complexes and application as asymmetric catalysis for Diels-Alder reactions
作者:Adam J. Davenport、David L. Davies、John Fawcett、David R. Russell
DOI:10.1016/j.jorganchem.2006.04.028
日期:2006.8
N-substituted chiral ethylenediamines and pyridine-2-methoxyimidate gives new chiral pyridine imidazolines (1a–c). These react with [RuCl2(mes)]2 (mes = 1,3,5-trimethyl benzene) in the presence of NaSbF6 to give complexes [RuCl(L)(mes)][SbF6] (5a–c) which after treatment with AgSbF6 are enantioselective catalysts for the Diels-Alderreaction of methacrolein and cyclopentadiene. The imidazoline catalysts are