Atropo-diastereoselective coupling of aryllithiums and arynes — variations around the chiral auxiliary
作者:David Augros、Boubacar Yalcouye、Anaïs Berthelot-Bréhier、Matthieu Chessé、Sabine Choppin、Armen Panossian、Frédéric R. Leroux
DOI:10.1016/j.tet.2016.01.047
日期:2016.8
The atropo-selective coupling of in situ generated arynes and aryllithiums bearing various chiral auxiliaries ortho to lithium (tert-butylsulfoxide, para-tolylsulfoxide, tartrate-derived chiral diethers and oxazolines) is described. Chiral oxazolines showed the best results in terms of yields of coupling products. Different reaction parameters like the nature of the aryne precursor, the oxazoline,
描述了在原位生成的芳烃和芳基锂的对位选择性偶联,所述芳烃和芳基锂带有与锂邻位的各种手性助剂(叔丁基亚砜,对甲苯基亚砜,酒石酸酯衍生的手性二醚和恶唑啉)。就偶联产物的产率而言,手性恶唑啉显示出最佳结果。揭示了不同的反应参数,如芳烃前体,恶唑啉,烷基锂碱或溶剂的性质,对于获得良好的收率和非对映选择性至关重要。