Benzoyl chloride → 6-Benzamido-2-oxindole

참여 물질

반응 단계

To a solution of 6-amino-1,3-dihydro-indol-2-one (0.15 g, 1.0 mmol) in 2:1 CH2Cl2-1,4-dioxane mixture (30 ml) is added triethylamine (0.30 g, 3.0 mmol) and benzoyl chloride (0.14 g, 1.0 mmol). The reaction is stirred for 2 hours at room temperature, and then a saturated aqueous solution of NH4Cl is added. The precipitate is collected and washed with water to give crude N-(2-oxo-2,3-dihydro-1H-indol-6-yl)-benzamide. To a solution of this benzamide (20 mg, 0.079 mmol) and 1H-pyrrole-2-carbaldehyde (7.6 mg, 0.079 mmol) in ethanol (2 ml) is added 2 drops of piperidine. It is stirred at 80° C. for 4 hours and then cooled to room temperature. The precipitate is collected by vacuum filtration, washed with a small amount of cold ethanol and purified by HPLC(C18 column, eluted with CH3CN—H2O containing 0.05% TFA) to give the desired compound as an orange solid: 1H NMR (DMSO-d6) δ 6.34 (s, 1H), 6.80 (s, 1H), 7.33 (s, 1H), 7.39 (d, 1H, J=8.4 Hz), 7.53 (t, 2H, J=7.8 Hz), 7.57 (s, 1H), 7.59 (s, 1H), 7.61 (s, 1H), 7.64 (s, 1H), 7.96 (d, 2H, J=7.8 Hz), 10.29 (s, 1H), 10.94 (s, 1H), 13.23 (s, 1H); LC-MS: 330.1 (MH+).

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