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。