Access to Atropisomerically Enriched Biaryls by the Coupling of Aryllithiums with Arynes under Control by Homochiral Oxazolines
作者:Boubacar Yalcouye、Anaïs Berthelot-Bréhier、David Augros、Armen Panossian、Sabine Choppin、Matthieu Chessé、Françoise Colobert、Frédéric R. Leroux
DOI:10.1002/ejoc.201501503
日期:2016.2
We report the preparation of axially stereoenriched biphenyls by the coupling of in situ generated aryllithiums and arynes using chiral oxazoline auxiliaries. The design of the aryne precursors, the choice of oxazoline and the reaction conditions were key to accessing the desired, highly substituted, atropisomerically enriched biarylic products. In one case, the two atropo-diastereomers could be obtained
我们报告了通过使用手性恶唑啉助剂将原位生成的芳基锂和芳烃偶联来制备轴向立体富集的联苯。芳炔前体的设计、恶唑啉的选择和反应条件是获得所需的、高度取代的、富含阻转异构的二芳基产物的关键。在一种情况下,可以通过柱色谱分离和通过 X 射线晶体学建立的绝对构型以异构纯形式获得两种阻滞非对映体。反应的立体选择性似乎受微妙的参数控制。