Dimethylformamide → 4-Chlorothieno[3,2-d]pyrimidine

Participants

Reaction Steps

After dimethylformamide (15.4 ml, 197.13 mmol) was added into 150 ml of dichloroethane with lowering the temperature to 0° C., oxalyl chloride (25 4 ml, 295.70 mmol) was slowly added. When white gel type started to form, 3H-thieno[3,2-d]pyrimidine-4-one (15 g, 98.57 mmol) was added. After 2.5 hours of reflex of the reaction mixture, the temperature was lowed to room temperature. After adding water, the reaction mixture was extracted using dichloromethane (3×300 ml) and dried with anhydrous magnesium sulfate. After concentrated under vacuum, trituration was carried out with 200 ml of hexane and the title compound (16.7 g, 99%) was obtained as a dark brown solid.

Provenance & Evidence