反应详情

温度

-10 °C

a)+b) 111 μl (1.38 mmol) (R)-3-hydroxytetrahydrofuran are dissolved in 5 ml of tetrahydrofuran and under protective gas at −10° C. mixed with 688 μl (1.38 mmol) of a 2 molar solution of lithium diisopropylamine in tetrahydrofuran. The mixture is stirred for 30 minutes at −10° C., then for one hour at ambient temperature. The mixture is cooled to −10° C. again and combined with a suspension of 400 mg (1.38 mmol) 4-azetidin-1-yl-2,6,7-trichloro-pteridine in 10 ml of tetrahydrofuran. The mixture is stirred for one hour at −10° C., slowly allowed to come up to ambient temperature and stirred for approx. another 16 hours. The reaction mixture is mixed with water and extracted with dichloromethane. The organic phase is dried on sodium sulphate and the solvent is eliminated in vacuo. The residue is stirred with diethyl ether, the precipitated solid is suction filtered, washed with diethyl ether and dried. 290 mg (R)-4-azetidin-1-yl-2,6-dichloro-7-(tetrahydrofuran-3-yl-oxy)-pteridine is obtained, which is dissolved in 13 ml dioxane and slowly added dropwise to a solution of 365 mg (4.24 mmol) piperazine in 12 ml dioxane at a temperature of 80° C. The mixture is stirred for approx. another 16 hours at 80° C., cooled to ambient temperature and water is added to the reaction mixture. It is extracted with dichloromethane, the organic phase is dried on sodium sulphate and purified by chromatography. Yield 170 mg (51% of theoretical)

1. waitfor one hour at ambient temperature
2. temperatureThe mixture is cooled to −10° C. again
3. stirringThe mixture is stirred for one hour at −10° C.
4. customto come up to ambient temperature
5. stirringstirred
6. waitfor approx. another 16 hours
7. extractionextracted with dichloromethane
8. customThe organic phase is dried on sodium sulphate
9. stirringThe residue is stirred with diethyl ether
10. filtrationfiltered
11. washwashed with diethyl ether
12. customdried