反应详情

温度

-20 °C

Into a reaction container, 4.2 g of exo-2-bromonorbornane, 0.70 g of magnesium, and 12 mL of THF were put, and this reaction container was heated by irradiation with microwaves (2.45 GHz, 100 W) for 10 minutes so that the Grignard reagent was prepared. Then, 2.3 g of 4-chloro-5-methyl-6-phenylpyrimidine obtained in Step 1 and 20 mL of THF were mixed, and while the mixture was being stirred at −20° C., the obtained Grignard reagent was added thereto. Further, 40 mg of Ni(dppe)Cl2 was also added, and the temperature of the mixture was increased to room temperature. An aqueous solution of ammonium chloride was added to this reaction solution, and an organic layer was extracted with ethyl acetate. The obtained organic layer was dried with magnesium sulfate. After the drying, the solution was filtered. The solvent of this solution was distilled off, and then the obtained residue was purified by flash column chromatography (silica gel) using a mixed solvent of dichloromethane and ethyl acetate as a developing solvent in a volume ratio of 9:1, to give the objective pyrimidine derivative Hnbmppm (yellow oily substance, 17% in yield). Note that the irradiation with microwaves was performed using a microwave synthesis system (Discover, manufactured by CEM Corporation). The synthesis scheme of Step 2 is shown by (b-3).

1. customwas prepared
2. temperaturethe temperature of the mixture was increased to room temperature
3. extractionan organic layer was extracted with ethyl acetate
4. dry with materialThe obtained organic layer was dried with magnesium sulfate
5. filtrationAfter the drying, the solution was filtered
6. distillationThe solvent of this solution was distilled off
7. customthe obtained residue was purified by flash column chromatography (silica gel)
8. customto give