8-Bromoadenine

66224-66-6

6974-78-3

Adenine (40 g) was used as starting material, which was placed in a flask and liquid bromine (107 mL) was slowly added under mechanical stirring. After addition, the reaction was continued with stirring for 3 hours at room temperature. Upon completion of the reaction, excess liquid bromine was removed by addition of sodium bisulfite solution. Subsequently, the reaction solution was adjusted to neutral with ammonia, at which time a white powdery solid precipitated. A filtration operation was carried out and the resulting solid was washed with ice water to give 8-bromoadenine as a pale yellow solid (54 g) in 85.7% yield.