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Synlett 2019; 30(16): 1924-1928
DOI: 10.1055/s-0039-1690675
DOI: 10.1055/s-0039-1690675
letter
Iron-Catalyzed C–H Sulfonylmethylation of Indoles in Water–PEG400
Financial support from the National Natural Science Foundation of China (Grant No. 21672192 and 21803059), the China Postdoctoral Science Foundation (Grant No. 2016M602254 and 2016M600582), the Program for Science & Technology Innovation Talents in Universities of Henan Province (Grant No. 17HASTIT004), the Aid Project for the Leading Young Teachers in Henan Provincial Institutions (Grant No. 2015GGJS-157), and the Natural Science Foundation of Henan Province (Grant No. 182300410255) is gratefully appreciated.Further Information
Publication History
Received: 18 June 2019
Accepted after revision: 23 August 2019
Publication Date:
10 September 2019 (online)
Abstract
An iron-catalyzed C–H sulfonylmethylation of indoles in water–PEG400 has been developed using p-toluenesulfonylmethyl isocyanide. This protocol enables direct regioselective construction of Csp2–Csp3 bond at the C3 position of indoles with a broad range of substrate compatibility in moderate to good yields, which is cost-effective and environmentally friendly.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0039-1690675.
- Supporting Information
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- 22 General Procedure for Preparation of Products 3 and 4To a 15 mL two-necked Schlenk tube fitted with glass stopper were added indoles 1 (0.1 mmol), TosMIC derivatives 2 (0.3 mmol), and FeSO4·7H2O (0.015 mmol, 4.2 mg) in a mixed solvent of H2O and PEG400 (v/v = 3:2, 2 mL) under an Ar atmosphere using the standard Schlenk techniques. The Schlenk tube was capped and heated at 110 °C for 24 h. The reaction mixture was then cooled to room temperature and concentrated directly. After removal of solvent, the residue was purified by preparative thin-layer chromatography (petroleum ether/EtOAc = 1:1) to give the desired product 3 and 4.4-Fluoro-3-(tosylmethyl)-1H-indole (3b)Brown solid (28.3 mg, 93%), mp 162–163 °C. 1H NMR (600 MHz, CDCl3): δ = 8.70 (s, 1 H), 7.59 (d, J = 7.4 Hz, 2 H), 7.18–7.16 (m, 3 H), 7.07–7.06 (m, 1 H), 7.01–6.98 (m, 1 H), 6.60 (t, J = 9.2 Hz, 1 H), 4.64 (s, 2 H), 2.36 (s, 3 H). 13C{1H} NMR (150 MHz, CDCl3): δ = 156.7 (d, J = 244.9 Hz), 144.5, 138.3 (d, J = 10.8 Hz), 135.5, 129.2, 128.5, 126.2, 122.8 (d, J = 8.0 Hz), 116.0 (d, J = 18.8 Hz), 107.6 (d, J = 3.6 Hz), 105.2 (d, J = 19.2 Hz), 100.6, 54.8, 21.6. 19F NMR (565 MHz, CDCl3): δ = –124.6. HRMS (positive ESI): m/z [M + Na]+ calcd for C16H14FNNaO2S+: 326.0621; found: 326.0621.