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Wakikawa T, Sekine D, Murata Y, Bunno Y, Kojima M, Nagashima Y, Tanaka K, Yoshino T, Matsunaga S. Native Amide-Directed C(sp 3 )-H Amidation Enabled by Electron-Deficient Rh III Catalyst and Electron-Deficient 2-Pyridone Ligand. Angew Chem Int Ed Engl 2022; 61:e202213659. [PMID: 36305194 DOI: 10.1002/anie.202213659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Indexed: 11/07/2022]
Abstract
Trivalent group-9 metal catalysts with a cyclopentadienyl-type ligand (CpMIII ; M=Co, Rh, Ir, Cp=cyclopentadienyl) have been widely used for directed C-H functionalizations, albeit that their application to challenging C(sp3 )-H functionalizations suffers from the limitations of the available directing groups. In this report, we describe directed C(sp3 )-H amidation reactions of simple amide substrates with a variety of substituents. The combination of an electron-deficient CpE Rh catalyst (CpE =1,3-bis(ethoxycarbonyl)-substituted Cp) and an electron-deficient 2-pyridone ligand is essential for high reactivity.
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Affiliation(s)
- Takumi Wakikawa
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Daichi Sekine
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Yuta Murata
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Youka Bunno
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Masahiro Kojima
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Yuki Nagashima
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Ken Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Tatsuhiko Yoshino
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
| | - Shigeki Matsunaga
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan.,Global Station for Biosurfaces and Drug Discovery, Hokkaido University, Kita-ku, Sapporo, 060-0812, Japan
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Song L, Van der Eycken EV. Transition Metal-Catalyzed Intermolecular Cascade C-H Activation/Annulation Processes for the Synthesis of Polycycles. Chemistry 2020; 27:121-144. [PMID: 32530508 DOI: 10.1002/chem.202002110] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Indexed: 12/16/2022]
Abstract
Polycycles are abundantly present in numerous advanced chemicals, functional materials, bioactive molecules and natural products. However, the strategies for the synthesis of polycycles are limited to classical reactions and transition metal-catalyzed cross-coupling reactions, requiring pre-functionalized starting materials and lengthy synthetic operations. The emergence of novel approaches shows great promise for the fields of organic/medicinal/materials chemistry. Among them, transition metal-catalyzed C-H activation followed by intermolecular annulation reactions prevail, due to their straightforward manner with high atom- and step-economy, providing rapid, concise and efficient methods for the construction of diverse polycycles. Several strategies have been developed for the synthesis of polycycles, relying on sequential multiple C-H activation/annulation, or combination of C-H activation/annulation and further interaction with a proximal group, or merger of C-H activation with a cycloaddition reaction, or in situ formation of the directing group. These are attractive, efficient, step- and atom-economic methods starting from commercially available materials. This Minireview will provide an introduction to transition metal-catalyzed C-H activation for the synthesis of polycycles, helping researchers to discover indirect connections and reveal hidden opportunities. It will also promote the discovery of novel synthetic strategies relying on C-H activation.
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Affiliation(s)
- Liangliang Song
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Erik V Van der Eycken
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium.,Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya street, Moscow, 117198, Russia
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