已经建立了一系列含有咪唑基手性PNN三齿配体和可控“侧臂”基团的Mn(I)催化剂,能够使不对称二苯甲酮进行不对称氢化,具有出色的活性(高达13000吨)和出色的对映选择性(高达> 99%ee)。该协议使用K 2 CO 3作为工业上可取的碱,并且具有广泛的底物范围和官能团耐受性。此外,催化剂中的亚胺基对于获得高活性和良好的对映选择性至关重要。
Highly Enantioselective Synthesis of Chiral Benzhydrols via Manganese Catalyzed Asymmetric Hydrogenation of Unsymmetrical Benzophenones Using an Imidazole-Based Chiral PNN Tridentate Ligand
A series of Mn(I) catalysts containing imidazole-based chiral PNN tridentate ligands with controllable “side arm” groups have been established, enabling the asymmetricalhydrogenation of unsymmetrical benzophenones with outstanding activity (up to 13 000 TON) and excellent enantioselectivity (up to >99% ee). This protocol uses K2CO3 as an industrially desirable base and features a wide substrate scope
已经建立了一系列含有咪唑基手性PNN三齿配体和可控“侧臂”基团的Mn(I)催化剂,能够使不对称二苯甲酮进行不对称氢化,具有出色的活性(高达13000吨)和出色的对映选择性(高达> 99%ee)。该协议使用K 2 CO 3作为工业上可取的碱,并且具有广泛的底物范围和官能团耐受性。此外,催化剂中的亚胺基对于获得高活性和良好的对映选择性至关重要。
Kinetic Resolution of Tertiary Benzyl Alcohols via Palladium/Chiral Norbornene Cooperative Catalysis
Herein we report a highly enantioselective kineticresolution of tertiary benzyl alcohols via palladium/chiral norbornene cooperative catalysis. With simple aryl iodides as the resolutionreagent, a wide range of readily available racemic tertiary benzyl alcohols are applicable to this method. Both chiral tertiary benzyl alcohols and benzo[c]chromene products are obtained in good to excellent enantioselectivities