A Planar-Chiral Rhodium(III) Catalyst with a Sterically Demanding Cyclopentadienyl Ligand and Its Application in the Enantioselective Synthesis of Dihydroisoquinolones
作者:Evgeniya A. Trifonova、Nikita M. Ankudinov、Andrey A. Mikhaylov、Denis A. Chusov、Yulia V. Nelyubina、Dmitry S. Perekalin
DOI:10.1002/anie.201801703
日期:2018.6.25
The rapid development of enantioselective C−H activation reactions has created a demand for new types of catalysts. Herein, we report the synthesis of a novel planar‐chiral rhodium catalyst [(C5H2tBu2CH2tBu)RhI2]2 in two steps from commercially available [(cod)RhCl]2 and tert‐butylacetylene. Pure enantiomers of the catalyst were obtained through separation of its diastereomeric adducts with natural
对映选择性CH活化反应的迅速发展产生了对新型催化剂的需求。在这里,我们报告了从市售[(cod)RhCl] 2和叔丁基乙炔分两步合成新型平面手性铑催化剂[(C 5 H 2 t Bu 2 CH 2 t Bu)RhI 2 ] 2的合成。催化剂的纯对映体是通过将其非对映体加合物与天然(S脯氨酸 催化剂促进了芳基异羟肟酸与应变烯烃的对映选择性反应,从而以高收率(最高97%)和良好的立体选择性(最高ee 95%)提供了二氢异喹诺酮。
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。