反应详情

At 5° C. sodium methylate (12.7 g) was added portionwise to a solution of dimethyl-(o-methoxyphenoxy)malonate (18.9 g) in methanol (450 ml). Upon completion of the addition stirring was continued at r.t. for 30 min followed by the addition of formamidine hydrochloride (6 g). The mixture was stirred at r.t. for 72 h. Eventually, the solvent was removed under reduced pressure and the remaining residue was suspended in diethyl ether. The solid material was filtered off and dissolved in water (100 ml). The solution was acidified with conc. hydrochloric acid. A white precipitate formed. The precipitate was collected, washed with water and dried to give 5-(o-methoxyphenoxy)-4,6-dihydroxy-pyrimidine (15.1 g) (or a tautomer) as a white powder.

1. additionUpon completion of the addition
2. stirringThe mixture was stirred at r.t. for 72 h
3. customEventually, the solvent was removed under reduced pressure
4. filtrationThe solid material was filtered off
5. dissolutiondissolved in water (100 ml)
6. customA white precipitate formed
7. customThe precipitate was collected
8. washwashed with water
9. customdried