Absolute Configuration for 1,<i>n</i>-Glycols: A Nonempirical Approach to Long-Range Stereochemical Determination
作者:Xiaoyong Li、Carmin E. Burrell、Richard J. Staples、Babak Borhan
DOI:10.1021/ja2119767
日期:2012.6.6
n-glycols (n = 2-12, 16) bearing two chiral centers were rapidly determined via exciton-coupled circulardichroism (ECCD) using a tris(pentafluorophenyl)porphyrin (TPFP porphyrin) tweezer system in a nonempirical fashion devoid of chemical derivatization. A unique "side-on" approach of the porphyrintweezer relative to the diol guest molecule is suggested as the mode of complexation.
Palladium(II)-Catalyzed Enantioselective Hydrooxygenation of Unactivated Terminal Alkenes
作者:Xintuo Yang、Xiang Li、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.2c02753
日期:2022.5.11
A novel Pd(II)-catalyzed enantioselective Markovnikov hydrooxygenation of unactivated terminal alkenes using a substituted pyridinyl oxazoline (Pyox) ligand has been developed. Herein it was discovered that the (EtO)2MeSiH/BQ redoxsystem is vital for the highly selective and efficient hydrooxygenation, where the alkylpalladium(II) species generated from enantioselective oxypalladation step is reduced