Tunable ferrocenyl diphosphine ligands for the Ir-catalyzed enantioselective hydrogenation of N-aryl imines
作者:Hans-Ulrich Blaser*、Hans-Peter Buser、Robert Häusel、Hans-Peter Jalett、Felix Spindler*
DOI:10.1016/s0022-328x(00)00766-x
日期:2001.3
Ferrocenyl diphosphines R2PF-P(R′)2 are effective, tunable ligands for the iridium catalyzed enantioselective hydrogenation of N-aryl imines in the presence of iodide and acid promoters. Structure–activity/selectivity correlations were found for the hydrogenation of N-(2-ethyl-6-methylphenyl)-N-(1′-methoxymethyl)-ethylidene-amine (MEA-imine) and for 2,3,3-trimethylindolenine (TMI). Extremely high catalytic
二茂铁基二膦R 2 PF-P(R')2是在碘化物和酸促进剂存在下铱催化的N-芳基亚胺对映体选择性氢化的有效,可调节的配体。发现了N-(2-乙基-6-甲基苯基)-N-(1'-甲氧基甲基)-亚乙基-胺(MEA-亚胺)和2,3,3-三甲基吲哚的氢化的结构-活性/选择性相关性(TMI)。使用[Ir(cod)Cl] 2和(R)-(S)-PPF-P(3,5-Xyl)2原位生成的催化剂观察到,MEA亚胺具有极高的催化活性和中等至良好的对映选择性。(xyliphos)。使用相同类型的催化剂,尽管具有较低的催化剂活性,但其他几种N-芳基亚胺也可以以31%至96%的对映选择性进行氢化。