Diastereoselective Benzylic Arylation of Tetralins
作者:Marion Davoust、Jackiâ A. Kitching、Matthewâ J. Fleming、Mark Lautens
DOI:10.1002/chem.200902694
日期:2010.1.4
Friedel–Crafts protocols for the intermolecular, trans‐selective benzylic arylation of tetralin systems are described (see scheme). The protocols have broad substrate scope and the use of enantiopure substrates allows the preparation of trans‐aryl‐substitutedtetralins in high ee.
Iridium-Catalyzed Asymmetric Ring-Opening Reactions of Oxabenzonorbornadienes with Amine Nucleophiles
作者:Dingqiao Yang、Yuhua Long、Junfang Zhang、Heping Zeng、Sanyong Wang、Chunrong Li
DOI:10.1021/om100384q
日期:2010.8.23
We have explored a new iridium-catalyzed ring-openingreaction of oxabenzonorbornadienes with a variety of primary aromatic amine or N-substituted piperazine nucleophiles, affording the corresponding products in excellent yields (up to 99%) with moderate enantioselectivity (25−81% ee). The trans configuration of product 2d was confirmed by X-ray crystallography.
Rhodium-catalyzed asymmetric ring opening reaction of oxabenzonorbornadienes with amines using ZnI<sub>2</sub> as the activator
作者:Xin Xu、Jingchao Chen、Zhenxiu He、Yongyun Zhou、Baomin Fan
DOI:10.1039/c5ob02331a
日期:——
[Rh(COD)Cl]2 and (R,R)-BDPP was used as an effective catalyst for the asymmetric ring opening reaction of oxabenzonorbornadienes with various amines by employing ZnI2 as the activator. Under the optimized reaction conditions, high enantioselectivities with good yields could be obtained from a wide scope of oxabenzonorbornadienes and amines.
Chiral NHC-Iridium Complexes and Their Performance in Enantioselective Intramolecular Hydroamination and Ring-Opening Amination Reactions
作者:Pengchao Gao、Daven Foster、Gellért Sipos、Brian W. Skelton、Alexandre N. Sobolev、Reto Dorta
DOI:10.1021/acs.organomet.9b00770
日期:2020.2.24
More importantly, the catalyst performance of these chiral cationic NHC-iridium complexes was expanded to the enantioselectivering-opening aminations of oxabicycles, where a highly enantioselectivecatalyst system was identified. Furthermore, we discovered that using the opposite axial stereochemistry on the NHC ligand completely switched the absolute configuration of the product, again showing high
introduced as catalysts for the intramolecular hydroamination reaction of unactivated aminoalkenes. The catalysts show high activity in the construction of pyrrolidines, which are accessed with excellent optical purity. Enantiomerically enriched piperidines and indolines are also produced, and various functional groups are tolerated with this LTM system. A reaction mechanism is proposed, and a major