反应详情

温度

60 °C

180 g (0.80 mol) of 2-chlorohypoxanthine-hydrochloride-monohydrate are suspended in 3.6 liters of water and the pH is adjusted to 6.5 by the dropwise addition of concentrated sodium hydroxide solution. After heating to 60° C. the solution is treated with 18 g of decolorising charcoal and filtered. The filtrate is added dropwise to 300 ml of water, whilst a pH of 3.0 +/- 0.5 is maintained in the aqueous solution using 1N hydrochloric acid. The resulting suspension is cooled to 5°-10° C., suction filtered and the precipitate is washed with 0.5 liters of water at a temperature of +5° C. and with 300 ml of isopropanol. After drying at 50° C., 117 g (85.8% of theory) of the title compound are obtained in the form of a colourless crystal powder. By purifying via the sodium salt and re-liberation of the base, analytically pure material is obtained which is identical to the substance prepared from 2,6-dichloropurine according to J. A. Montgomery and L. B. Holum [J. Am. Chem. Soc. 79 (957) 2185].

1. filtrationfiltered
2. additionThe filtrate is added dropwise to 300 ml of water, whilst a pH of 3.0 +/- 0.5
3. temperatureis maintained in the aqueous solution
4. temperatureThe resulting suspension is cooled to 5°-10° C.
5. filtrationsuction filtered
6. washthe precipitate is washed with 0.5 liters of water at a temperature of +5° C. and with 300 ml of isopropanol
7. customAfter drying at 50° C.