反应详情

A mixture of 4-(benzyloxy)-6-chloro-3H-imidazo[4,5-c]pyridine 2.24 (1.00 g, 3.85 mmol) and K2CO3 (1.06 g, 7.70 mmol) were suspended in DMF and iodomethane (0.312 mL. 5.01 mmol) was added dropwise. The reaction was stirred for 2 hours and judged to be complete by LC and TLC. The reaction was concentrated, diluted with NaHCO3 (30 mL) and EtOAc (50 mL), and the layers were separated. The aqueous layer was extracted with EtOAc (3×50 mL), dried, filtered, and concentrated under reduced pressure to afford a mixture of regioisomers. Purification via flash chromatography (2→5% THF in CH2Cl2) afforded 4-(benzyloxy)-6-chloro-3-methyl-3H-imidazo[4,5-c]pyridine 2.25 as the first eluting isomer.

1. concentrationThe reaction was concentrated
2. additiondiluted with NaHCO3 (30 mL) and EtOAc (50 mL)
3. customthe layers were separated
4. extractionThe aqueous layer was extracted with EtOAc (3×50 mL)
5. customdried
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customto afford
9. additiona mixture of regioisomers
10. customPurification via flash chromatography (2→5% THF in CH2Cl2)