Pd-catalyzed asymmetric Suzuki–Miyaura couplings of 3-methyl-2-bromophenylamides, 3-methyl-2-bromo-1-nitrobenzene and 1-naphthaleneboronic acids have been successfully developed and the corresponding axially chiral biaryl compounds were obtained in very high yields (up to 99%) with good enantioselectivities (up to 88% ee) under mild conditions. The chiral-bridged biphenyl monophosphine ligands developed by our group exhibit significant superiority to the naphthyl counterpart MOP in both reactivity and enantioselectivity control. The large steric hindrance from π-conjugated ortho-substituents of the bromobenzene substrates and the Pd···O interaction between carbonyl and palladium seem essential to achieve high enantioselectivity.

中文翻译：

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Pd催化的不对称Suzuki-Miyaura偶联反应用于合成在2位具有大空间取代基的手性联芳基化合物。

已成功开发了Pd催化的3-甲基-2-溴苯基酰胺，3-甲基-2-溴-1-硝基苯和1-萘硼酸的不对称Suzuki-Miyaura偶联，并以很高的收率获得了相应的轴向手性联芳基化合物（最高99％），在温和条件下具有良好的对映选择性（最高88％ee）。由我们小组开发的手性桥联联苯基单膦配体在反应性和对映选择性控制方面均显示出优于萘基对应MOP的优势。溴苯底物的π共轭邻位取代基的较大位阻以及羰基与钯之间的Pd··O相互作用似乎对实现高对映选择性至关重要。