Acetic Acid → 8-Bromo-9-methyladenine

Participants

Reaction Steps

Fifteen grams (0.1 mol) of 9-methyladenine of Example 1 was dissolved in 1.5 liters of buffer prepared from 30.8 g of sodium acetate, 1.4 liters of water and sufficient acetic acid to provide a pH of 4.0. To this solution was added dropwise 25 ml of bromine in 2 liters of water over a period of two hours. The reaction was stirred a further two hours and the resulting solid filtered off and rinsed with the water. The solid was air dried and warmed to about 50° in about 80 ml of methanol, stripped to a hazy suspension and filtered. The precipitate after rinsing with water and drying at 40° under vacuum overnight weighed 15.6 g. The filtrate was stripped of methanol and a further 1.6 g was collected. The combined solids were triturated in about 100 ml of acetone for three hours and then allowed to sit overnight. The resulting precipitate was filtered and washed with acetone to yield 13.3 g after drying at 40° on a vacuum pump overnight.

Provenance & Evidence