Reacción #4001

Ecuación de reacción

4-chloro-4-chloromethyloxetan-2-one

guanidine hydrochloride

hydrogen chloride

→

2-amino-4-chloromethyl-6-hydroxypyrimidine

Disolventes

water

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturaheated under nitrogen
2. 2
   Otropurge as the bath temperature
3. 3
   Otroapproached 100° C.
4. 4
   Otroreaction
5. 5
   OtroWhen the initial reaction
6. 6
   workup.WAITsubsided after a few minutes
7. 7
   Temperaturathe bath temperature was raised to 130° C.
8. 8
   Otroas indicated by cessation of gassing (about 1 hour)
9. 9
   Temperaturato cool about 60° C.
10. 10
    ExtracciónThe solution was extracted with 500 parts of ethyl acetate
11. 11
    workup.ADDITIONThe aqueous phase was treated with decolourising charcoal
12. 12
    Filtraciónfiltered
13. 13
    workup.ADDITIONthe pH was adjusted to pH 8 by the addition of saturated aqueous sodium bicarbonate solution
14. 14
    FiltraciónThe precipitated solid was filtered
15. 15
    Lavadowashed with water
16. 16
    Otrodried to constant weight at 80° C. in a vacuum oven

Procedimiento

620 parts of 4-chloro-4-chloromethyloxetan-2-one and 440 parts of guanidine hydrochloride were charged to a reaction flask and the mixture was stirred and heated under nitrogen purge as the bath temperature was gradually raised to 120° C. When the bath temperature approached 100° C., reaction commenced accompanied by evolution of hydrogen chloride. When the initial reaction subsided after a few minutes the bath temperature was raised to 130° C. and held until the reaction ceased as indicated by cessation of gassing (about 1 hour). The reaction mixture was allowed to cool about 60° C. and 1750 parts of water was added to the syrup. The solution was extracted with 500 parts of ethyl acetate and the extract was discarded. The aqueous phase was treated with decolourising charcoal, filtered and the pH was adjusted to pH 8 by the addition of saturated aqueous sodium bicarbonate solution. The precipitated solid was filtered, washed with water and dried to constant weight at 80° C. in a vacuum oven to give 2-amino-4-chloromethyl-6-hydroxypyrimidine, m.p. 195°-197° C.

Fuente