Highly Efficient and Stereoselective Construction of Bispirooxindole Derivatives via a Three-Component 1,3-Dipolar Cycloaddition Reaction
作者:Qin Xu、De Wang、Yin Wei、Min Shi
DOI:10.1002/open.201402003
日期:2014.6
A highly regio‐ and stereoselective synthesis of bispirooxindoles by 1,3‐dipolar cycloaddition of in situ generated azomethine ylides from isatin and proline to different electron‐deficient alkenes has been developed. The synthesis affords the desired bispiro scaffold compounds in excellent yields with high regioselectivity under mild conditions. The stereochemistry was determined by single‐crystal
Mechanism of the Asymmetric Hydrogenation of Exocyclic α,β-Unsaturated Carbonyl Compounds with an Iridium/BiphPhox Catalyst: NMR and DFT Studies
作者:Yuanyuan Liu、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1002/anie.201309677
日期:2014.2.10
mechanism of the asymmetric hydrogenation of exocyclicα,β‐unsaturated carbonyl compounds with the (aS)‐Ir/iPr‐BiphPhox catalyst was studied by NMR experiments and DFT computational analyses. Computed optical yields of the asymmetric hydrogenation proceeding by an iridium(I)/iridium(III) mechanism involving a transition state stabilized through two intramolecular hydrogen bonds are in good accordance
通过NMR实验和DFT计算分析研究了(aS)-Ir / i Pr-BiphPhox催化剂对环外α,β-不饱和羰基化合物不对称氢化的机理。通过铱(I)/铱(III)机理进行的涉及通过两个分子内氢键稳定的过渡态的不对称氢化的计算光学收率与实验ee 值非常一致。
Enantiodivergent Hydrogenation of Exocyclic α,β‐Unsaturated Lactams Enabled by Switching the N‐Chirality of Iridium Catalyst
An unprecedented N-stereogenic center playing an impressive role in the iridium/Rong-Phos-catalyzed enantio-divergent asymmetric hydrogenation was observed. Rong-Phos is easily prepared from readily available starting materials, which selectively form two diastereoisomeric Ir-complexes with fixed N-chirality depending on the coordination conditions.
[60]Fullerene-Fused Cyclopentanes: Mechanosynthesis and Photovoltaic Application
作者:Gang Shao、Chuang Niu、Hong-Wei Liu、Huan Yang、Jun-Shen Chen、Yang-Rong Yao、Shangfeng Yang、Guan-Wu Wang
DOI:10.1021/acs.orglett.3c00332
日期:2023.2.24
The mechanochemical cascade reaction of [60]fullerene with 3-benzylidene succinimides, diethyl 2-benzylidene succinate, or 2-benzylidene succinonitrile in the presence of an inorganic base has been investigated undersolvent-free and ball-milling conditions. This protocol provides an expedient method to afford various [60]fullerene-fused cyclopentanes, showing advantages of good substrate scope, short