Synthesis of Chiral-Bridged Atropisomeric Monophosphine Ligands with Tunable Dihedral Angles and their Applications in Asymmetric Suzuki-Miyaura Coupling Reactions
作者:Wang Xia、Yongsu Li、Zihong Zhou、Huixuan Chen、Hao Liang、Sifan Yu、Xuefeng He、Yaqi Zhang、Jiyan Pang、Zhongyuan Zhou、Liqin Qiu
DOI:10.1002/adsc.201700020
日期:2017.5.17
construction of diastereomeric biaryl monophosphines by means of the substrate-directed asymmetric annulation reactions. A series of new chiral-bridged atropisomeric biphenyl monophosphine ligands with tunable dihedral angles was accordingly synthesized successfully without a resolution step being needed. Using these ligands, different kinds of axially chiral 1,1′-biaryl-2-phosphonates including the first
在非对映体联芳基单膦化合物的构建中,首先通过底物定向的不对称环化反应实现了精确的手性识别。因此,成功地合成了具有可调二面角的一系列新的手性桥联的阻转异构联苯单膦配体,而无需拆分步骤。使用这些配体,通过钯催化的不对称Suzuki偶联反应,可以制备42-97%的产率的轴向手性1,1'-联芳基-2-膦酸酯,包括首次报道的喹啉基联芳基膦酸酯,最高可达96%ee。