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Synlett 2021; 32(04): 373-377
DOI: 10.1055/s-0040-1707252
DOI: 10.1055/s-0040-1707252
cluster
Radicals – by Young Chinese Organic Chemists
Dual Photoredox/Palladium-Catalyzed C–H Acylation of 2-Arylpyridines with Oxime Esters
We are grateful to the NNSFC (21971081 and 91856119), the Science and Technology Department of Hubei Province (2017AHB047), and the Program of Introducing Talents of Discipline to Universities of China (111 Program, B17019) for support of this research.Further Information
Publication History
Received: 24 June 2020
Accepted after revision: 26 July 2020
Publication Date:
21 August 2020 (online)
Published as part of the Cluster Radicals – by Young Chinese Organic Chemists
Abstract
An unprecedented dual photoredox/palladium-catalyzed iminyl-radical-mediated C–C bond cleavage and directed ortho C–H acylation of 2-arylpyridines by using oxime esters is described. Oxime esters can serve as efficient acyl sources through formation of the corresponding acyl radicals by photoredox-catalyzed iminyl-radical-mediated C–C bond cleavage. This redox-neutral protocol features excellent regioselectivity, a broad substrate scope, and good functional-group tolerance with respect to both components, giving a broad range of aryl ketones with generally good yields.
Key words
photocatalysis - palladium catalysis - C–H activation - acylation - iminyl radical - oxime estersSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0040-1707252.
- Supporting Information
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26
1-(2-Pyridin-2-ylphenyl)ethanone (3aa); Typical Procedure A 10 mL, flame-dried, round-bottomed Schlenk flask equipped with a magnetic stirrer bar was charged with 1a (0.2 mmol, 31.04 mg), 2a (0.4 mmol, 57.26 mg), AgOTf (0.5 mmol, 128.47 mg), fac-Ir(ppy)3 (0.002 mmol, 1.31 mg), and Pd(TFA)2 (0.02 mmol, 6.65 mg). The flask was evacuated and backfilled with Ar three times, and the mixture was irradiated with 7 W blue LED strips until the reaction was complete (24–48 h; TLC). The mixture was then poured into a separatory funnel containing 20 mL of sat. aq NaCl and washed with CH2Cl2 (20 mL). The organic layers were separated, dried (Na2SO4), filtered, and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel) to give a colorless oil; yield: 29.6 mg (75%). 1H NMR (400 MHz, CDCl3): δ = 8.64 (d, J =
4.4 Hz, 1 H), 7.78 (t, J = 7.7 Hz, 1 H), 7.60 (dd, J = 12.9, 7.7 Hz, 2 H), 7.53 (t, J = 6.9 Hz, 2 H), 7.47 (d, J = 8.1 Hz, 1 H), 7.27 (t, J = 5.9 Hz, 1 H), 2.23 (s, 3 H). 13C NMR (100 MHz, CDCl3): δ = 204.1, 157.6, 149.2, 141.5, 138.8, 136.7, 130.3, 129.1, 128.6, 127.6, 122.5, 122.3, 30.5. HRMS (EI): m/z [M + H]+ calcd for C13H12NO: 198.0913; found: 198.0918.