反应详情

温度

70 °C

Methallylamine (211 g, 2.97 mol) is added to a solution of concentrated hydrochloric acid (250 ml) in water (1.91), followed by portionwise addition of potassium cyanate (240 g, 2.97 mol). The reaction is then heated for 2 hours at 80° C., prior to cooling and evaporation to afford (2-methyl-allyl)-urea (244.5 g), mp 114-115° C. The urea (268 g, 2.35 mol) is added to a solution of cyanoacetic acid (220 g, 2.59 mol) in acetic anhydride (536 ml) and the reaction is heated at 70° C. for 1 hour, cooled to 0° C. and diluted with ether. The resultant solid is collected by filtration, washed with ether, suspended in water (2.21) and heated to 75° C. 2M aqueous sodium hydroxide solution is then added portionwise over 30 min to maintain pH between 8 and 9.5. The reaction is cooled to room temperature, treated with acetic acid (12 ml), further cooled to 10° C. and the resultant solid is collected by filtration, washed with cold water and dried to afford 6-amino-1-(2-methyl-allyl)-1H-pyrimidine-2,4-dione, mp 267-269° C. The uracil (253 g, 1.40 mol) is added to a solution of sodium hydroxide (123 g, 3.07 mol) in water (2.5 l) and allowed to exotherm then cooled to 20° C. Dimethyl sulfate (196 ml, 2.06 mol) is added portionwise over 1 hour. After standing overnight, the reaction is cooled to 5° C. and the solid collected by filtration to give 6-amino-3-methyl-1-(2-methyl-allyl)-1H-pyrimidine-2,4-dione, mp 162-163° C. The methyluracil (165 g, 0.85 mol) is suspended in water (1.55 l) and concentrated hydrochloric acid (72 ml). A solution of sodium nitrite (58.4 g, 0.85 mol) in water (117 ml) is then added dropwise over 30 minutes and the reaction is stirred at 20° C. for 3 hours. The solid is collected by filtration, washed successively with water, methanol and ether to afford 6-amino-3-methyl-1-(2-methyl-allyl)-5-nitroso-1H-pyrimidine-2,4-dione, mp 213° C. (dec). The nitrosouracil (190 g, 0.85 mol) is suspended in water (950 ml), heated to 85° C. and sodium dithionite (85%, 347.2 g, 1.69 mol) is added portionwise. After cooling to room temperature, the solid is collected by filtration to afford 5,6-diamino-3-methyl-1-(2-methyl-allyl)-1H-pyrimidine-2,4-dione, mp 152-153° C.

1. temperaturecooled to 0° C.
2. filtrationThe resultant solid is collected by filtration
3. washwashed with ether
4. temperatureheated to 75° C
5. addition2M aqueous sodium hydroxide solution is then added portionwise over 30 min
6. temperatureto maintain pH between 8 and 9.5
7. temperatureThe reaction is cooled to room temperature
8. additiontreated with acetic acid (12 ml)
9. temperaturefurther cooled to 10° C.
10. filtrationthe resultant solid is collected by filtration
11. washwashed with cold water
12. customdried