Cu-Catalyzed Direct Asymmetric Mannich Reaction of 2-Alkylazaarenes and Isatin-Derived Ketimines
Yao‐Bin Shen, Hui-Ling Qian, Lei Yang, Zhou Shun, Han-Wen Rao, Zhen‐Hua Wang, Yong You, Yanping Zhang, Jun‐Qing Yin, Jian‐Qiang Zhao, Wenjing Zhang, Wei‐Cheng Yuan
Abstract
The first direct catalytic asymmetric Mannich reaction of 2-alkylazaarenes and ketimines was realized with a chiral Cu-bis(oxazoline) complex as the catalyst. The asymmetric addition of 2-alkylpyridines to isatin-derived ketimines proceeded smoothly to afford α,β-functionalized 2-substituted pyridines bearing 3-amino-3,3-disubstituted oxindole motifs with excellent results (≤99% yield, 99:1 dr, and 98% ee). The catalytic system was also extended to 2-alkylbenzothiazoles as nucleophiles for the asymmetric Mannich reaction of ketimines.
Topics & Concepts
IsatinChemistryCatalysisMannich reactionYield (engineering)NucleophileOxindoleOxazolineCombinatorial chemistryEnantioselective synthesisOrganic chemistryMedicinal chemistryMetallurgyMaterials scienceAsymmetric Synthesis and CatalysisCatalytic C–H Functionalization MethodsAsymmetric Hydrogenation and Catalysis