Sodium Hydroxide → 6-Butyryl-7-chloro-3-methoxythieno[3,2-b]pyridine

Participants

Reaction Steps

3-Methoxy-6-butyrylthieno[3,2-b]pyridin-7(4H)-one (3 g) and phosphorus oxychloride (10 ml) were heated under reflux for one hour. The reaction mixture was poured onto ice water (100 g) stirred for 30 minutes and then basified with 40% sodium hydroxide solution cooling with ice, then extracted with chloroform (3×100 ml). The chloroform extracts were combined dried over magnesium sulphate, filtered and evaporated under reduced pressure to give a brown solid, 3.1 g, m.p. 76°-78°.

Provenance & Evidence