Water → 2-Chloro-1-methyl-1H-indole-3-carbaldehyde

関与物質

反応手順

A solution of 2-chloro-1H-indole-3-carboxaldehyde (1.0 g, 5.5 mmol) in DMF (30 mL) is treated portionwise over 10 min with 60% sodium hydride (440 mg, 11 mmol). After stirring for 30 min, methyl iodide (685 μL, 11 mmol) is slowly added and the resulting mixture is stirred 3 hr at room temperature. Water (5 mL) is cautiously added and the solvents are removed. The residue is dissolved in ethyl acetate and washed with water, with brine, dried, filtered and concentrated to give 2-chloro-1-methyl-1H-indole-3-carboxaldehyde (1.16 g, 105%), mp 94.5-95.5° C., as a white solid. MS 194 (M+H).

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