反应详情

104.25 g (0.438 mol) of 2,5-dibromopyrimidine, 100.00 g (0.438 mol) of 4-(phenylmethoxy)benzeneboronic acid, 4.75 g (0.00438 mol) of palladium (10%) on activated carbon, 4.50 g (0.01752 mol) of triphenylphosphine and 93.00 g (0.876 mol) of sodium carbonate are heated in 1000 ml of toluene, 500 ml of ethanol and 300 ml of water for 24 hours at 80° C. The palladium catalyst is subsequently separated off from the reaction mixture at 80° C. by filtration. The aqueous lower 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 dried in a high vacuum. The crude product thus obtained is recrystallized from acetonitrile (3000 ml), giving 150.07 g (97% yield, based on 2,5-dibromopyridine) of 5-bromo-2-[4-(phenylmethoxy)phenyl]pyrimidine (purity according to HPLC: 98%). ##STR4## mp.: 153°-155° C.

1. customThe palladium catalyst is subsequently separated off from the reaction mixture at 80° C. by filtration
2. customThe aqueous lower 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. customdried in a high vacuum
5. customThe crude product thus obtained
6. customis recrystallized from acetonitrile (3000 ml)