Sodium hydride → 1-(5-Methoxycarbonylpentyl)-5-chloro-3-methyl-2-(3-pyridyl)indole

Participants

Reaction Steps

To a suspension of 1.39 g of 50% sodium hydride (dispersion in mineral oil) in 30 ml of dimethylformamide is added under nitrogen at 0°-5° dropwise while stirring a solution of 6.59 g of 5-chloro-3-methyl-2-(3-pyridyl)-indole (prepared as described in U.S. Pat. No. 3,468,894) in 60 ml of dimethylformamide. After addition is complete the suspension is stirred at 0° for 1/2 hour. While maintaining the temperature at 0° a solution of 6.06 g of methyl 6-bromohexanoate in 10 ml of dimethylformamide is added dropwise. The reaction mixture is allowed to reach room temperature and is stirred at room temperature for 5 hours, and poured into 400 ml of ice water. The resulting mixture is extracted with ethyl acetate (3×300 ml). The ethyl acetate extract is washed with saturated sodium chloride solution, dried over magnesium sulfate and evaporated to dryness to give 1-(5-methoxycarbonylpentyl)-5-chloro-3-methyl-2-(3-pyridyl)indole as an oil.

Provenance & Evidence