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CC BY 4.0 · SynOpen 2019; 03(01): 16-20
DOI: 10.1055/s-0037-1611676
DOI: 10.1055/s-0037-1611676
letter
Iron-Catalysed Aerobic Oxidative C–C Bond Cleavage of Ketones for the Synthesis of Primary Amides
The authors wish to thank the National Natural Science Foundation of China (21506017), The Natural Science Foundation of the Jiangsu Higher Education Institutions of China (18KJB610021) and the Flagship Major Development of Jiangsu Higher Education Institutions (PPZY2015B113).Further Information
Publication History
Received: 01 January 2019
Accepted after revision: 28 January 2019
Publication Date:
18 February 2019 (online)
Abstract
An iron-catalysed aerobic oxidative C–C bond cleavage of ketones for the synthesis of primary amides has been developed using TEMPO and oxygen as an oxidant. This reaction tolerates a wide range of substrates, and primary amides are obtained in good to excellent yields. Substrates with long-chain alkyl substituents could also be selectively cleaved and converted into the corresponding amides.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0037-1611676.
- Supporting Information
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- 20 Typical synthetic procedure: To a mixture of 1a (60 mg, 0.4 mmol) and NaN3 (78 mg, 1.2 mmol) in DMF (2.0 mL) were added Fe2(SO4)3 (16.0 mg, 0.04 mmol), TEMPO (12.5 mg, 0.08 mol) and H2O (0.216 mL, 12 mmol). The reaction mixture was heated to 120 °C and stirred for 30 h under an oxygen atmosphere, until the substrate 1a was consumed as indicated by TLC. The solvent was removed under reduced pressure and the residue was purified by flash column chromatography (eluent: petroleum ether/ethyl acetate = 2:1) to afford product 2a (57.4 mg, 95% yield). 1H NMR (500 MHz, CDCl3): δ = 7.79 (d, J = 8.5 Hz, 2 H), 6.94 (d, J = 8.5 Hz, 2 H), 5.96 (s, 1 H), 5.74 (s, 1 H), 3.86 (s, 3 H). 13C NMR (125 MHz, CDCl3): δ = 168.8, 162.5, 129.2, 125.5, 113.7, 55.4. HRMS (ESI): m/z [M+H]+ calcd. for C8H10NO2: 152.0712; found: 152.0714.