Catalytic Synthesis of Chiral Phosphole Oxides via Desymmetric C–H Arylation of o-Bromoaryl Phosphine Oxides
作者:Yu-Ming Cui、Li-Wen Xu、Yan Lin、Wei-Yang Ma、Qiao-Ying Sun
DOI:10.1055/s-0036-1588983
日期:2017.7
A palladium-catalyzed intramolecular direct arylation reaction of o-bromoaryl phosphine oxides was developed to afford a variety of P-stereogenic phosphole oxides in good yields. The enantioselectivities were closely associated with the specific structures of substrates, which ranged from 4–94%. As a result of ready availability of starting materials and simple operation to improve the enantioselectivities
开发了钯催化的邻溴芳基氧化膦的分子内直接芳基化反应,以良好的收率提供各种 P-立体氧化磷。对映选择性与底物的特定结构密切相关,范围为 4-94%。由于原料易得且操作简单以提高低 ee 值产物的对映选择性,该方法为合成 P-立体磷氧化物提供了一种简单直接的方法。
Pd-Catalyzed Asymmetric C–H Bond Activation for the Synthesis of P-Stereogenic Dibenzophospholes
作者:Zhen Li、Zi-Qi Lin、Chao-Guo Yan、Wei-Liang Duan
DOI:10.1021/acs.organomet.9b00216
日期:2019.10.28
Pd-catalyzed asymmetric C–Hbondactivation for the synthesis of P-stereogenic dibenzophospholes was efficiently achieved via two types of catalytic systems. Chiral phosphoric amides/acids as ligands provided the products with up to 5:95 er, and (R)-segphos as ligand resulted in enantioselectivities of up to 98:2.