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。
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 chiralauxiliaries 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,
The synthesis of a useful chiral biaryl catalyst. An oxazoline-mediated Ullmann reaction.
作者:Todd D. Nelson、A.I. Meyers
DOI:10.1016/s0040-4039(00)93379-3
日期:1993.5
A rapid synthesis of the enantiomerically pure biary catalyst (S)-1 was accomplished by a stereoselective Ullmann reaction (Scheme 1).
对映体纯的二元催化剂(S)-1的快速合成是通过立体选择性Ullmann反应完成的(方案1)。
The asymmetric Ullmann reaction III. Application of a first-order asymmetric transformation to the synthesis of C2-symmetric chiral, non-racemic biaryls
作者:Todd D. Nelson、A.I. Meyers
DOI:10.1016/s0040-4039(00)76879-1
日期:1994.5
Heating a diastereomeric mix of (62:38) chiral biaryls with Cu-ion resulted in a (93:7) mix of diastereomers.
将(62:38)手性联芳基与铜离子的非对映异构体混合物加热,得到(93:7)非对映异构体混合物。
Nelson Todd D., Meyers A. I., Tetrahedron Lett, 35 (1994) N 20, S 3259-3262
作者:Nelson Todd D., Meyers A. I.
DOI:——
日期:——
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。