反应详情

10.43 g (0.044 mol) of 2,5-dibromopyrimidine, 10 g (0.044 mol) of 4-(phenylmethoxy)benzeneboronic acid, 253 mg (0.00044 mol) of Pd(dba)2, (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 at 80° C. from the reaction mixture by filtration. 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 14.7 g (93% yield, based on 2,5-dibromopyrimidine) of 5-bromo-2-[4-(phenylmethoxy) phenyl]pyrimidine (content according to HPLC: 98%). ##STR23##

1. customThe palladium catalyst is subsequently separated at 80° C. from the reaction mixture by filtration
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)