1
|
Iwasaki T, Ishiga W, Pal S, Nozaki K, Kambe N. Mechanistic Insight into Rh-Catalyzed C(sp 2)–O Bond Cleavage Applied to Cross-Coupling Reaction of Benzofurans with Aryl Grignard Reagents. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takanori Iwasaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Wataru Ishiga
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 560-0871, Japan
| | - Shrinwantu Pal
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Nobuaki Kambe
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 560-0871, Japan
| |
Collapse
|
2
|
Du J, Wang X, Wang H, Wei J, Huang X, Song J, Zhang J. Photoinduced Palladium-Catalyzed Intermolecular Radical Cascade Cyclization of N-Arylacrylamides with Unactivated Alkyl Bromides. Org Lett 2021; 23:5631-5635. [PMID: 34236201 DOI: 10.1021/acs.orglett.1c01698] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A mild visible-light-induced Pd-catalyzed intermolecular radical cascade reaction of N-arylacrylamides with unactivated alkyl bromides is disclosed. Photoexcited Pd complexes transfer a single electron in this protocol, and hybrid alkyl Pd-radical species are involved as the key reaction intermediates. Sophisticated bioactive oxindole derivatives bearing various substituents and substitution patterns can be efficiently afforded through this approach.
Collapse
Affiliation(s)
- Juan Du
- International Joint Research Centre for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China.,College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| | - Xing Wang
- International Joint Research Centre for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| | - Hongling Wang
- International Joint Research Centre for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| | - Jinhu Wei
- International Joint Research Centre for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| | - Xuan Huang
- International Joint Research Centre for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| | - Jun Song
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| | - Junmin Zhang
- International Joint Research Centre for Molecular Science, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
| |
Collapse
|
3
|
Iwasaki T, Akaiwa T, Hirooka Y, Pal S, Nozaki K, Kambe N. Synthesis of and Structural Insights into Contact Ion Pair and Solvent-Separated Ion Pair Diphenyliridate Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00446] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Takanori Iwasaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Toshikazu Akaiwa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, 560-0871, Japan
| | - Yuko Hirooka
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Shrinwantu Pal
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Nobuaki Kambe
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, 560-0871, Japan
| |
Collapse
|
4
|
Miloserdov FM, Rajabi NA, Lowe JP, Mahon MF, Macgregor SA, Whittlesey MK. Zn-Promoted C-H Reductive Elimination and H 2 Activation via a Dual Unsaturated Heterobimetallic Ru-Zn Intermediate. J Am Chem Soc 2020; 142:6340-6349. [PMID: 32134645 PMCID: PMC7660749 DOI: 10.1021/jacs.0c01062] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
![]()
Reaction
of [Ru(PPh3)3HCl] with LiCH2TMS,
MgMe2, and ZnMe2 proceeds with
chloride abstraction and alkane elimination to form the bis-cyclometalated
derivatives [Ru(PPh3)(C6H4PPh2)2H][M′] where [M′] = [Li(THF)2]+ (1), [MgMe(THF)2]+ (3), and [ZnMe]+ (4),
respectively. In the presence of 12-crown-4, the reaction with LiCH2TMS yields [Ru(PPh3)(C6H4PPh2)2H][Li(12-crown-4)2] (2). These four complexes demonstrate increasing interaction
between M′ and the hydride ligand in the [Ru(PPh3)(C6H4PPh2)2H]− anion following the trend 2 (no interaction) < 1 < 3 < 4 both in the solid-state
and solution. Zn species 4 is present as three isomers
in solution including square-pyramidal [Ru(PPh3)2(C6H4PPh2)(ZnMe)] (5), that is formed via C–H reductive elimination and features
unsaturated Ru and Zn centers and an axial Z-type [ZnMe]+ ligand. A [ZnMe]+ adduct of 5, [Ru(PPh3)2(C6H4PPh2)(ZnMe)2][BArF4] (6) can be trapped
and structurally characterized. 4 reacts with H2 at −40 °C to form [Ru(PPh3)3(H)3(ZnMe)], 8-Zn, and contrasts the analogous reactions
of 1, 2, and 3 that all require
heating to 60 °C. This marked difference in reactivity reflects
the ability of Zn to promote a rate-limiting C–H reductive
elimination step, and calculations attribute this to a significant
stabilization of 5 via Ru → Zn donation. 4 therefore acts as a latent source of 5 and
this operational “dual unsaturation” highlights the
ability of Zn to promote reductive elimination in these heterobimetallic
systems. Calculations also highlight the ability of the heterobimetallic
systems to stabilize developing protic character of the transferring
hydrogen in the rate-limiting C–H reductive elimination transition
states.
Collapse
Affiliation(s)
- Fedor M Miloserdov
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Nasir A Rajabi
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - John P Lowe
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Mary F Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Stuart A Macgregor
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | | |
Collapse
|
5
|
Sandl S, Jacobi von Wangelin A. The Role of Organoferrates in Iron-Catalyzed Cross-Couplings. Angew Chem Int Ed Engl 2020; 59:5434-5437. [PMID: 31999050 DOI: 10.1002/anie.201914844] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Indexed: 02/06/2023]
Abstract
Recent groundbreaking studies on organoferrates have demonstrated that coordinatively unsaturated three-coordinate-σ-alkylferrates are active catalysts in Fe-catalyzed cross-couplings with Grignard reagents and that pronounced solvent and counterion effects dictate metalate speciation and catalyst activity. Thanks to modern spectroscopic methods, sensitive catalyst intermediates could be analyzed.
Collapse
Affiliation(s)
- Sebastian Sandl
- Department of Chemistry, University of Hamburg, Martin Luther King Platz 6, 20146, Hamburg, Germany
| | - Axel Jacobi von Wangelin
- Department of Chemistry, University of Hamburg, Martin Luther King Platz 6, 20146, Hamburg, Germany
| |
Collapse
|
6
|
|
7
|
Iwasaki T. Catalytic Construction of Carbon Frameworks Employing Alkyl Fluorides as Electrophiles. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Takanori Iwasaki
- Department of Chemistry and Biotechnology, The University of Tokyo
| |
Collapse
|