Asymmetric Synthesis of an Axially Chiral Antimitotic Biaryl via an Atropo-Enantioselective Suzuki Cross-Coupling
作者:Audrey Herrbach、Angela Marinetti、Olivier Baudoin、Daniel Guénard、Françoise Guéritte
DOI:10.1021/jo034298y
日期:2003.6.1
A catalytic asymmetric synthesis of the axially chiral bridged biaryl (-)-2, a structural analogue of natural (-)-rhazinilam possessing original antimitotic properties, is described. The key step is an intermolecular asymmetric Suzuki coupling, furnishing the nonbridged biaryl (-)-6, precursor of (-)-2, with up to 40% ee using binaphthyl ligand 7a. Various known or new binaphthyl and ferrocenyl phosphines
描述了轴向手性桥联联芳基(-)-2(具有原始抗有丝分裂特性的天然(-)-rhazinilam的结构类似物)的催化不对称合成。关键步骤是分子间不对称Suzuki偶联,使用双萘配体7a为(-)-2的前体非桥接联芳基(-)-6提供高达40%ee。在该反应中,筛选了各种已知的或新的联萘基和二茂铁基膦以及膦烷作为配体,并对其条件进行了优化。与另一个Suzuki偶联系统的比较表明7a是迄今为止描述的这种类型转化最通用的配体。这项工作将不对称Suzuki偶联首次应用于生物学相关的靶标。