Imidazo[1,2-a]pyridin-2(3H)-one--hydrogen bromide (1/1) → 3-(4-Methyl-benzo[b]thiophen-3-ylmethylene)-imidazo[1,2-a]pyridin-2-one

Participants

Reaction Steps

A mixture of 1.6 g (7.4 mmol) of imidazo[1,2-a]pyridin-2-one hydrobromide salt and 1.2 g (6.7 mmol) of 4-methyl-benzo[b]thiophene-3-carbaldehyde in 40 mL of ethanol is heated at reflux for 1 h and then cooled to room temperature. The precipitate is collected. The isolated solid is suspended in 40 mL of 2M potassium carbonate solution and the resulting mixture is stirred for 48 h at room temperature. The solid is collected and washed with water to give the desired compound.

Provenance & Evidence