反应详情

10.43 g (0.044 mol) of 2,5-dibromopyrimidine, 10 g (0.044 mol) of 4-(phenylmethoxy)benzeneboronic acid, 98.8 mg (0.00044 mol) of palladium(II) acetate, (0.001752 mol) of TPPTS and 9.3 g (0.0876 mol) of sodium carbonate are heated at 80° C. in 100 ml of toluene, 50 ml of ethanol and 30 ml of water for 48 hours. The palladium catalyst is subsequently separated off from the reaction mixture by filtration at 80° C. The lower aqueous phase of the reaction mixture is separated off at 80° C. before the organic phase is freed of the solvents on a rotary evaporator and is dried in a high vacuum. The crude product thus obtained is crystallized from acetonitrile (300 ml), giving 14.5 g (93% yield, based on 2,5-dibromopyrimidine) of 5-bromo-2-[4-(phenylmethoxy)phenyl]-pyrimidine (content according to HPLC: 98%). ##STR18##

1. customThe palladium catalyst is subsequently separated off from the reaction mixture by filtration at 80° C
2. customThe lower aqueous phase of the reaction mixture is separated off at 80° C. before the organic phase
3. customis freed of the solvents on a rotary evaporator
4. customis dried in a high vacuum
5. customThe crude product thus obtained
6. customis crystallized from acetonitrile (300 ml)