Dimethylformamide → 4-(7-Chlorothieno[3,2-b]pyridin-2-yl)-1-ethyl-1H-imidazole-2-carbaldehyde

Participants

Reaction Steps

To a solution of 7-chloro-2-(1-ethyl-1H-imidazol-4-yl)thieno[3,2-b]pyridine (13, scheme 4) (1.50 g, 5.69 mmol) in tetrahydrofuran at −78° C. (1.3 mL) was added n-Butyllithium (3.4 mL, 8.53 mmol) and the reaction mixture was stirred for about 15 minutes. Dimethylformamide (0.66 mL, 8.53 mmol) was added slowly and the reaction mixture was stirred at −78° C. until completion of the reaction. The mixture was warmed to room temperature and quenched with water. The precipitate was removed by filteration, washed with water and dried well. The crude product was purified by trituration with dichloromethane, filtered, washed with additional dichloromethane and dried to afford the title compound 111 as a yellow solid (682 mg, 41% yield). MS (m/z): 291.9 (M+H).

Provenance & Evidence