Synthesis of Axially Chiral 1,1′-Binaphthalenes by Palladium-Catalysed Cross-Coupling Reactions of Triorganoindium Reagents
作者:Ángeles Mosquera、Miguel A. Pena、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1002/ejoc.201300042
日期:2013.5
heterocyclic analogues can be efficiently prepared by palladium-catalysed cross-coupling reactions between tri(1-naphthyl)indium reagents and 1-halonaphthalenes and haloisoquinolines. The reactions were usually carried out in THF at 80 °C with a slight excess of the indium reagent (40 mol-%) and a low catalyst loading (4 mol-% Pd) to afford the cross-coupling products in good yields (45–99 %). The method allows
通过钯催化的三(1-萘基)铟试剂与 1-卤代萘和卤代异喹啉之间的交叉偶联反应,可以有效地制备 1,1'-联萘和杂环类似物。反应通常在 80 °C 的 THF 中进行,铟试剂略过量(40 mol%)和低催化剂负载(4 mol% Pd),以良好的产率提供交叉偶联产物(45 –99%)。该方法允许合成空间位阻的 2-取代和 2,2'-二取代 1,1'-联萘和萘基异喹啉。此外,偶联反应可以对映选择性进行,并通过使用手性氨基磷烷二茂铁基配体 (R,S)-PPFA 获得最佳对映体过量。