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Synlett 2018; 29(08): 1084-1086
DOI: 10.1055/s-0036-1591897
DOI: 10.1055/s-0036-1591897
letter
tert-Butylhydroperoxide-Mediated Oxidation of Carbazole-3-carboxyaldehydes
This work was supported by a Ministry of Science, Technology and Innovation grant (06-02-09-SF0041), the International Medical University, Malaysia and Research University (RUI) Grant Scheme (1001/CDADAH/811257), Universiti Sains Malaysia.Further Information
Publication History
Received: 07 November 2017
Accepted after revision: 26 December 2017
Publication Date:
29 January 2018 (online)
Abstract
Oxidation of carbazole-3-carboxyaldehydes promoted by a 70% aqueous solution of tert-butylhydroperoxide leads to the corresponding carbazole-3-carboxylic acids in good yields. This transition-metal-free oxidation protocol is attractive for the synthesis of pharmaceutically important carbazole analogues.
Key words
oxidation - carbazole-3-carboxyaldehyde - carbazole-3-carboxylic acid - tert-butylhydroperoxide - dimethyl sulfoxide (DMSO)Supporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1591897.
- Supporting Information
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- 28 Representative procedure: To a mixture of 9-ethylcarbazole-3-carboxyaldehyde (1 mmol) in DMSO (4 mL) at room temperature, aq. 70% TBHP (6.0 equiv) was added and the mixture was stirred at 100 °C for 12 h. After completion of reaction (TLC monitoring), the mixture was treated with water (15 mL) and extracted with ethyl acetate (2 × 20 mL). The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The crude product was purified by column chromatography to afford pure 9-ethylcarbazole-3-carboxylic acid. Yield: 65%; white solid; mp 222–224 °C; IR (KBr): 3458, 2925, 1678, 1597, 1469, 1382, 1230, 724 cm–1; 1H NMR (500 MHz, DMSO-d 6): δ = 12.56 (br. s, 1 H), 8.80 (d, J = 1.5 Hz, 1 H), 8.28 (d, J = 7.7 Hz, 1 H), 8.07 (dd, J = 8.6, 1.6 Hz, 1 H), 7.69–7.66 (m, 2 H), 7.52 (t, J = 8.2 Hz, 1 H), 7.27 (t, J = 7.8 Hz, 1 H), 4.49 (q, J = 7.1 Hz, 2 H), 1.34 (t, J = 7.2 Hz, 3 H); 13C NMR (125 MHz, DMSO-d 6): δ = 168.5, 142.5, 140.7, 127.5, 126.9, 123.0, 122.7, 122.4, 121.6, 121.2, 120.1, 110.0, 109.2, 37.7, 14.1; MS: m/z 238 [M – H+]. Anal. Calcd. C15H13NO2: C, 75.30; H, 5.48; N, 5.85. Found: C, 75.23; H, 5.54; N, 5.78.