Formal Direct Cross‐Coupling of Phenols with Amines
作者:Zhengwang Chen、Huiying Zeng、Simon A. Girard、Feng Wang、Ning Chen、Chao‐Jun Li
DOI:10.1002/anie.201506751
日期:2015.11.23
The transition‐metal‐catalyzedamination of arylhalides has been the most powerful method for the formation of arylamines over the past decades. Phenols are regarded as ideal alternatives to arylhalides as coupling partners in cross‐couplings. An efficient palladium‐catalyzed formal cross‐coupling of phenols with various amines and anilines has now been developed. A variety of substituted phenols
Asymmetric Transfer Hydrogenations of 2,3-Disubstituted Quinoxalines with Ammonia Borane
作者:Songlei Li、Wei Meng、Haifeng Du
DOI:10.1021/acs.orglett.7b00935
日期:2017.5.19
An asymmetrictransferhydrogenation of 2,3-disubstituted quinoxalines using a chiral frustrated Lewis pair of Piers’ borane and (R)-tert-butylsulfinamide as the catalyst with ammoniaborane as the hydrogen source has been successfully realized. For 2-alkyl-3-arylquinoxaline substrates, cis-tetrahydroquinoxalines were obtained as the predominant products in high yields with 77–86% ee. In contrast,