Water → Methyl 5-chloro-1-(quinolin-4-yl)-1H-indole-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

0.771 g (24 mmol) of sodium hydride at 75% by weight in liquid petroleum jelly is added to a solution of 5.03 g (24 mmol) of 5-chloro-3-methoxycarbonyl-1H-indole in 120 cm3 of dimethylformamide at a temperature in the region of 20° C. under an argon atmosphere. After the reaction mixture has been stirred for 0.5 hour at a temperature in the region of 40° C., 3.94 g (24 mmol) of 4-chloroquinoline are added. After stirring for 6 hours at a temperature in the region of 120° C., the reaction mixture is cooled to a temperature in the region of 20° C. and then poured into 400 cm3 of water and extracted with 500 cm3 of ethyl acetate. The organic phase is washed three times with 250 cm3 of water, dried over anhydrous magnesium sulphate, filtered and then concentrated to dryness under reduced pressure (2.7 kPa). The residue is purified by chromatography on silica gel (eluent: dichloromethane). After the fractions containing the expected product have been concentrated to dryness under reduced pressure, 2.5 g of 5-chloro-3-methoxycarbonyl-1-(quinolin-4-yl)-1H-indole are obtained in the form of a sticky beige-colored solid, which is used in the following step without further purification.

Provenance & Evidence