反应详情

温度

2.5 °C

Diethylaluminum chloride (1.0 M in CH2Cl2, 3.6 mL, 3.6 mmol) was added to a 0-5° C. mixture of 2-bromo-5H-pyrrolo[2,3-b]pyrazine (0.237 g, 1.20 mmol) and 5 mL of dichloromethane in a sealed tube, and the mixture was stirred at 0-5° C. for 30 min. Crude 5-cyano-2,2-dimethyl-pentanoyl chloride from the previous step (“2.98 mmol”) dissolved in 3 mL of dichloromethane was added, and the mixture was stirred at 60° C. for 16 h. A sat. aq. NaHCO3 solution (50 mL) was carefully added, followed by 50 mL of ethyl acetate. The mixture was filtered through Celite, and the layers separate. The aqueous layer was extracted with 50 mL of ethyl acetate. The combined organic layers were dried over MgSO4, filtered and concentrated to a residue. Column chromatography (0→80% EtOAc/hexanes) afforded 0.079 g (20%) of 6-(2-bromo-5H-pyrrolo[2,3-b]pyrazin-7-yl)-5,5-dimethyl-6-oxo-hexanenitrile as a yellow liquid.

1. additionwas added
2. stirringthe mixture was stirred at 60° C. for 16 h
3. filtrationThe mixture was filtered through Celite
4. customthe layers separate
5. extractionThe aqueous layer was extracted with 50 mL of ethyl acetate
6. dry with materialThe combined organic layers were dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated to a residue