Water → 5-bromo-3-formyl-1H-indole-6-carbonitrile

関与物質

反応条件

反応手順

Phosphorus oxychloride (1.39 mL, 14.9 mmol) was added dropwise over 5 minutes to DMF (10 mL) with stirring. The clear mixture was stirred at room temperature for 10 minutes. A solution of 5-bromo-1H-indole-6-carbonitrile (1.10 g, 4.97 mmol) in DMF (1.5 with 0.5 mL wash) was added to the clear red solution, and the reaction mixture was stirred at room temperature for 5 min. The resulting grey suspension was heated to 80° C. under nitrogen for 25 min, and then allowed to cool to room temperature. The reaction mixture was treated slowly with water (30 mL) and aqueous 1N NaOH (30 mL) at room temperature. The resulting thick suspension was then heated to 85° C. for five minutes with vigorous stirring. The reaction mixture was allowed to cool to room temperature over 5 minutes, and the solids were collected by filtration. The solids were dried in vacuo for 16 hours at 55° C. to afford the title compound (1.15 g, 92%) as a cream-colored solid. MS (ES−) 247.1 (M−H)−. 1H NMR (500 MHz, DMSO-d6) δ 12.76 (br. s., 1H), 9.99 (s, 1H), 8.60 (s, 1H), 8.43 (s, 1H), 8.18 (s, 1H).

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