反应详情

温度

99 °C

6-Aminouracil (2.50 g, 19.1 mmol) was added to glacial acetic acid (24.6 mL) and water (6.1 mL) and the mixture heated to 99° C. A solution of 5-[(2E)-3-(dimethylamino)prop-2-enoyl]-2-methoxybenzyl pivalate (3.1 g, 9.5 mmol) in DMSO (9.2 mL) was then added over 280 minutes. The reaction was stirred at 99° C. for a further 50 minutes and cooled to 0° C. A solution of potassium hydroxide (24 g, 363.6 mmol) in water (48 mL) was then added to achieve a pH of around 7.0. Aqueous potassium carbonate was then added to afford a pH of around 10. After an hour at RT, a beige solid was filtered off, washed three times with aqueous potassium carbonate and pulled visibly dry on the filter. The beige solid was then added to a solution of citric acid (7.1 g) in water (44 ml) and the mixture maintained at 20° C. for 60 minutes. The resulting creamy white solid was isolated by filtration and washed with water until neutral pH of the wash liquors was obtained. The solid was dried to constant weight in vacuo thus affording 3.34 g of desired product (3).

1. temperaturecooled to 0° C
2. customto afford a pH of around 10
3. waitAfter an hour at RT
4. filtrationa beige solid was filtered off
5. washwashed three times with aqueous potassium carbonate
6. custompulled visibly dry on the filter
7. additionThe beige solid was then added to a solution of citric acid (7.1 g) in water (44 ml)
8. temperaturethe mixture maintained at 20° C. for 60 minutes
9. customThe resulting creamy white solid was isolated by filtration
10. washwashed with water until neutral pH of the wash liquors
11. customwas obtained
12. customThe solid was dried to constant weight in vacuo