Asymmetric Hydrogenation of In Situ Generated Isochromenylium Intermediates by Copper/Ruthenium Tandem Catalysis
作者:Tingting Miao、Zi-You Tian、Yan-Mei He、Fei Chen、Ya Chen、Zhi-Xiang Yu、Qing-Hua Fan
DOI:10.1002/anie.201611291
日期:2017.4.3
The first asymmetrichydrogenation of in situgeneratedisochromenylium derivatives is enabled by tandemcatalysis with a binary system consisting of Cu(OTf)2 and a chiral cationic ruthenium–diamine complex. A range of chiral 1H‐isochromenes were obtained in high yields with good to excellent enantioselectivity. These chiral 1H‐isochromenes could be easily transformed into isochromanes, which represent
Organocatalytic Redox Deracemization of Cyclic Benzylic Ethers Enabled by An Acetal Pool Strategy
作者:Miao Wan、Shutao Sun、Yangshan Li、Lei Liu
DOI:10.1002/anie.201701439
日期:2017.4.24
The first redox deracemization of a series of cyclic benzylic ethers, including 6H‐benzo[c]chromenes, isochromans, and 1H‐isochromenes, is described. An “acetal pool” strategy was adopted to harmonize the complete oxidation of secondary ethers with imidodiphosphoric acid catalyzed asymmetric transfer hydrogenation. The synthetic utility of the process was demonstrated by the effective deracemization
描述了一系列环状苄基醚的首次氧化还原脱硝,其中包括6 H-苯并[ c ]色烯,异色满和1 H-异色酮。采用了“缩醛池”策略,以协调仲醚与亚氨基二磷酸催化的不对称转移氢化反应的完全氧化。该方法的合成效用通过有效地脱除感兴趣的生物活性分子而得到证明,而该生物活性分子很难用其他方法制备。