Chiral Bidentate Boryl Ligand Enabled Iridium-Catalyzed Asymmetric C(sp2)–H Borylation of Diarylmethylamines
- Xiaoliang ZouXiaoliang ZouState Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute, Lanzhou Institute of Chemical Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Lanzhou 73000, ChinaMore by Xiaoliang Zou,
- Haonan ZhaoHaonan ZhaoState Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute, Lanzhou Institute of Chemical Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Lanzhou 73000, ChinaMore by Haonan Zhao,
- Yinwu LiYinwu LiSchool of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, ChinaMore by Yinwu Li,
- Qian GaoQian GaoState Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute, Lanzhou Institute of Chemical Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Lanzhou 73000, ChinaMore by Qian Gao,
- Zhuofeng Ke*Zhuofeng Ke*[email protected]School of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, ChinaMore by Zhuofeng Ke, and
- Senmiao Xu*Senmiao Xu*[email protected]State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute, Lanzhou Institute of Chemical Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Lanzhou 73000, ChinaKey Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, ChinaMore by Senmiao Xu
Abstract
Optically active organoboronic acids and their derivatives are an important family of target compounds in organic chemistry, catalysis, and medicinal chemistry. Yet there are rare asymmetric catalytic examples reported for the synthesis of these compounds via atom and step economic ways. Herein, we report a chelate-directed iridium-catalyzed asymmetric C(sp2)–H borylation of aromatic C–H bonds directed by free amine groups. The success of these transformations relies on a novel family of chiral bidentate boryl ligands (L). They can be synthesized straightforwardly in three steps starting from readily available (S,S)-1,2-diphenyl-1,2-ethanediamie ((S,S)-DPEN). The Ir-catalyzed C(sp2)–H borylation comprises two parts. The first part is desymmetrization of prochiral diarylmethylamines. In the presence of L3/Ir, a vast array of corresponding borylated products were obtained with high regioselectivity and good to excellent enantioselectivities (26 examples, up to 96% ee). The second part, kinetic resolution of racemic diarylmethylamines, was also conducted. Good selectivity values (up to 68%, 11 examples) were obtained when L8 was used. We also demonstrated the synthetic utility of the current method on gram-scale reaction for several transformations. The C–B bonds of borylated products could be converted to a variety of functionalities including C–O, C–C, C–C, C–Br, and C–P bonds. Finally, we performed DFT calculations of desymmetrization to understand its reaction pathways.
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