Boron tribromide → 2,6-Dimethyl-4-(5-methylsulfanyl-7-propoxyoxazolo[5,4-d]pyrimidin-2-yl)phenol
反応式
B(Br)(Br)Br.C[O:6][C:7]1[C:12]([CH3:13])=[CH:11][C:10]([C:14]2[O:15][C:16]3[N:17]=[C:18]([S:27][CH3:28])[N:19]=[C:20]([O:23][CH2:24][CH2:25][CH3:26])[C:21]=3[N:22]=2)=[CH:9][C:8]=1[CH3:29]>ClCCl>[CH3:13][C:12]1[CH:11]=[C:10]([C:14]2[O:15][C:16]3[N:17]=[C:18]([S:27][CH3:28])[N:19]=[C:20]([O:23][CH2:24][CH2:25][CH3:26])[C:21]=3[N:22]=2)[CH:9]=[C:8]([CH3:29])[C:7]=1[OH:6]参加物
4
実験手順
At −20° C., 0.70 ml of boron tribromide was added slowly to a solution of 2.5 g of 2-(4-methoxy-3,5-dimethylphenyl)-5-methylsulfanyl-7-propoxyoxazolo[5,4-d]pyrimidine in 50 ml of dichloromethane. After 1 h at −20° C. and 2 h at room temperature, the mixture was quenched by addition of saturated aqueous sodium bicarbonate solution, with the temperature being kept below 5° C. After phase separation, the aqueous phase was extracted twice with dichloromethane. The combined organic phases were dried and concentrated under reduced pressure. This gave 2.0 g of the title compound.