palladium‐catalyzed enantioselectiveCHfunctionalization of indoles was achieved with an axiallychiral2,2′‐bipyridine ligand, thus providing the desired indol‐3‐acetate derivatives with up to 98 % ee. Moreover, the reaction protocol was also effective for asymmetric OH insertion reaction of phenols using α‐aryl‐α‐diazoacetates. This represents the first successful application of bipyridine ligands with axial
轴向手性的2,2'-联吡啶配体实现了钯催化对映体的C C H的对映选择性CH官能化,从而提供了所需的吲哚-3-乙酸酯衍生物,其ee高达98%。此外,该反应方案对于使用α-芳基-α-重氮乙酸酯的酚的不对称OH插入反应也有效。这代表具有轴向手性的联吡啶配体在钯催化的卡宾迁移插入反应中的首次成功应用。
Catalytic enantioselective C–H functionalization of indoles with α-diazopropionates using chiral dirhodium(II) carboxylates: asymmetric synthesis of the (+)-α-methyl-3-indolylacetic acid fragment of acremoauxin A
first catalyticasymmetricsynthesis of the (+)-α-methyl-3-indolylacetic acid fragment of acremoauxin A, a potent plant-growth inhibitor. Furthermore, the Fujioka protocol using a combination of TMSOTf and 2,2′-bipyridyl was shown to be superior for the removal of the N-MOM group.