反应详情

2,4-Dimethoxy-pyrimidine-5-boronic acid (commercially available from Aldrich, 830 mg, 4.5 mmol) was dissolved in degassed n-PrOH (10 mL) and then 3-bromo-6-methylpyridine (600 mg, 3.5 mmol), Na2CO3 (956 mg, 9 mmol), PPh3 (90 mg, 0.35 mmol) and Pd(OAc)2 (78 mg, 0.35 mmol) were added. The suspension was stirred at reflux for 1.5 hours. The solvent was evaporated under vacuum and the crude was partitioned between water and ethyl acetate. The organic phase was dried (Na2SO4) and evaporated. The crude was purified by SCX cartridge washing with MeOH and then collecting the product with MeOH—NH4OH (95-5) to give 500 mg of the title compound (62% yield).

1. temperatureat reflux for 1.5 hours
2. customThe solvent was evaporated under vacuum
3. customthe crude was partitioned between water and ethyl acetate
4. dry with materialThe organic phase was dried (Na2SO4)
5. customevaporated
6. customThe crude was purified by SCX cartridge
7. washwashing with MeOH
8. customcollecting the product with MeOH—NH4OH (95-5)