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Synlett 2017; 28(18): 2407-2410
DOI: 10.1055/s-0036-1588417
DOI: 10.1055/s-0036-1588417
cluster
Nickel-Catalyzed N-Arylation Using N-Trimethylsilyl-carbazole
Supported by: Grants-in-Aid for Young Scientists (B) 25870747Supported by: Japan Science and Technology Agency ACT-C
Further Information
Publication History
Received: 06 March 2017
Accepted after revision: 11 April 2017
Publication Date:
08 May 2017 (online)
Published as part of the Cluster Silicon in Synthesis and Catalysis
Abstract
Nickel-catalyzed N-arylation reaction of N-trimethylsilyl-carbazole using aryl bromides is found to proceed in the presence of sodium acetate, giving N-aryl-carbazoles in high yields. Under these conditions, N-trimethylsilyl-carbazole could react with aryl bromides selectively even in the presence of other N-trimethylsilyl-amines or N-H-amines. This arylation reaction was applied to the polymerization to provide a polycarbazole.
Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1588417.
- Supporting Information
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References and Notes
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- 10 General Experimental Procedure for the Synthesis of N-Aryl-carbazoles A mixture of Ni(cod)2 (0.050 mmol), SIPr·HCl (0.050 mmol), KOt-Bu (0.050 mmol), and CPME was stirred at 100 °C for 30 min. To this was added NaOAc (0.85 mmol), aryl bromide 1 (0.50 mmol), and N-TMS-carbazole 2 (0.65 mmol). The reaction mixture was quenched with H2O. The aqueous layer was extracted with Et2O and washed with brine. The combined organic layers were dried over anhydrous MgSO4. After concentration in vacuo, the residue was purified by flash chromatography on silica gel or preparative TLC to afford N-aryl-carbazoles 3. N-(4-Methoxyphenyl)-3,6-dichloro-9H-carbazole (3j) was obtained according to the general experimental procedure. Pale yellow solid; yield 140 mg (78%). 1H NMR (400 MHz, CDCl3): δ = 3.90 (s, 3 H), 7.08 (d, J = 9.2 Hz, 2 H), 7.19 (d, J = 8.8 Hz, 2 H), 7.32–7.35 (m, 4 H), 8.00 (d, J = 2.0 Hz, 2 H). 13C NMR (126 MHz, CDCl3): δ = 55.7, 111.1, 115.4, 120.2, 123.3, 125.6, 126.8, 128.5, 129.5, 140.2, 159.4. MS (EI, 70 eV): m/z (%) = 341 (100) [M+], 326 (33), 306 (3), 262 (16), 228 (14), 171 (4).
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- 12 The Supporting Information can be used for detailed procedures and the characterization data of other products.
For recent selected examples, see:
For selected examples, see:
For recent reviews of cross-coupling reaction using organosilanes, see:
For reviews, see:
For reviews of Ni-catalyzed C–N bond-forming coupling, see: