A Frustrated Lewis Pair Catalyzed Asymmetric Transfer Hydrogenation of Imines Using Ammonia Borane
作者:Songlei Li、Gen Li、Wei Meng、Haifeng Du
DOI:10.1021/jacs.6b07245
日期:2016.10.5
Lewis acid and base together. Piers' borane and chiral tert-butylsulfinamide were chosen as the FLP, and a metal-free asymmetrictransferhydrogenation of imines was realized with high enantioselectivities. Significantly, with ammonia borane as hydrogen source, a catalytic asymmetric reaction using 10 mol % of Piers' borane, chiral tert-butylsulfinamide, and pyridine additive, has been successfully
A Continuously Regenerable Chiral Ammonia Borane for Asymmetric Transfer Hydrogenations
作者:Qiwen Zhou、Wei Meng、Jing Yang、Haifeng Du
DOI:10.1002/anie.201806877
日期:2018.9.10
A novel chiral ammonia borane was designed and developed through the dehydrogenation of ammonia borane with a chiral phosphoric acid, which was highly effective for the asymmetric transfer hydrogenation of imines and β‐enamino esters to afford high levels of reactivities and enantioselectivities. Significantly, this chiral ammonia borane can be continuously regenerated during the transfer hydrogenation
Gallium Trichloride Catalyzed Hydroamination of Alkynes: Scope, Limitation, and Mechanistic Studies by DFT
作者:Lei Li、Genping Huang、Zhou Chen、Wei Liu、Xiufang Wang、Yanmei Chen、Lijuan Yang、Wu Li、Yahong Li
DOI:10.1002/ejoc.201200829
日期:2012.10
The successful application of galliumtrichloride as a catalyst for the intermolecular hydroamination of alkynes with aromatic amines is reported. The reaction is effective with many aniline derivatives and shows exclusive selectivity for the Markovnikov products. The mechanism of the transformation was investigated by DFT calculations and a plausible pathway is proposed.
[GRAPHICS]Addition of aniline derivatives to aromatic and aliphatic alkynes proceeds efficiently in the presence of a gold(I) catalyst (0.01-1.0 mol %) to afford ketimines in good yields.
A Scalable Method for Regioselective 3-Acylation of 2-Substituted Indoles under Basic Conditions
molecular scaffolds in bioactive molecules. We here present an operationally simple, high yielding and scalable method for regioselective 3-acylation of 2-substitutedindoles under basic conditions using functionalized acid chlorides. The method shows good tolerance to both electron-withdrawing and donating substituents on the indole scaffold and gives ready access to a variety of functionalized 3-acylindole