General Enantioselective C−H Activation with Efficiently Tunable Cyclopentadienyl Ligands
作者:Zhi-Jun Jia、Christian Merten、Rajesh Gontla、Constantin G. Daniliuc、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201611981
日期:2017.2.20
applicable chiral Cp ligand collection (JasCp ligands) with highly variable and adjustable structures. Their modular nature and their amenability to rapid structure variation enabled the efficientdiscovery of ligands for three enantioselective RhIII‐catalyzed C−H activation reactions, including one unprecedented transformation. This novel approach should enable the discovery of efficientchiral Cp ligands
Mild complexation protocol for chiral Cp<sup>x</sup>Rh and Ir complexes suitable for <i>in situ</i> catalysis
作者:B. Audic、M. D. Wodrich、N. Cramer
DOI:10.1039/c8sc04385j
日期:——
A practical complexation method for chiral cyclopentadienyl (Cpx) iridium and rhodium complexes is described. The procedure uses the free CpxH with stable and commercially available rhodium(I) and iridium(I) salts without base or additive. The conditions are mild and do not require the exclusion of air and moisture. A salient feature is the suitability for in situ complexations enhancing the user-friendliness
描述了一种实用的手性环戊二烯基(Cp x)铱和铑配合物的络合方法。该程序使用游离的Cp x H和稳定且可商购的铑(I)和铱(I)盐,而不添加碱或添加剂。条件温和,不需要排除空气和湿气。一个显着的特点是适合原位络合,增强了Cp x的用户友好性配体在不对称催化下。DFT计算证实了通过结合的乙酸盐或甲醇盐的分子内质子提取途径。此外,质子提取步骤具有优异的面部选择性,使得能够开发出含TMS的三取代Cp x配体,该配体对基准二氢异喹诺酮合成显示出改进的对映选择性。
Rhodium Catalysts with a Chiral Cyclopentadienyl Ligand Derived from Natural R‐Myrtenal
作者:Roman A. Pototskiy、Andrey V. Kolos、Yulia V. Nelyubina、Dmitry S. Perekalin
DOI:10.1002/ejoc.202001029
日期:2020.10.8
Rhodium complex with a new chiral cyclopentadiene was synthesized from the natural (R)‐myrtenal and tested as a catalyst in C–H activation reaction providing dihydroisoquinolinones with high yields and moderate enantioselectivity.
The synthesis of a set of cobalt(III)-complexes equipped with trisubstituted chiral cyclopentadienyl ligands is reported, and their steric and electronic parameters are mapped. The application potential of these complexes for asymmetric C-H functionalizations with 3d-metals is shown by the synthesis of dihydroisoquinolones from N-chlorobenzamides with a broad range of alkenes. The transformation proceeds
报道了一组配备三取代手性环戊二烯基配体的钴 (III) 配合物的合成,并绘制了它们的空间和电子参数。这些配合物在具有 3d 金属的不对称 CH 官能化方面的应用潜力通过从具有广泛烯烃的 N-氯苯甲酰胺合成二氢异喹诺酮类药物来展示。转化过程具有高达 99.5:0.5 er 的出色对映选择性和高区域选择性。对于这种反应类型,观察到的值优于基于铑 (III) 的最佳方法。此外,具有挑战性的底物(如烷基烯烃)也会与高区域选择性和对映选择性反应。
Cobalt-Catalyzed Enantioselective C–H Annulation with Alkenes
further demonstrate the practicability of this protocol to potential industrial applications. Density functional theory calculations elucidate the reactionmechanism, and the spin-state change in the olefin insertion step accelerates the subsequent C–N reductive elimination, which is identified as the stereo-determining step. The AIM analysis indicates that the π π and C–H π interactions are vital for controlling