Chloroacetyl chloride → 1-((1S)-2-{[tert-Butyl(dimethyl)silyl]oxy}-1-methylethyl)-4-chloro-2-(chloromethyl)-6,7-dimethyl-1H-imidazo[4,5-c]pyridine

Temperature

0 °C

N4-((1S)-2-{[tert-Butyl(dimethyl)silyl]oxy}-1-methylethyl)-2-chloro-5,6-dimethylpyridine-3,4-diamine (2.85 g, 8.29 mmol) was dissolved in 100 mL of dry 1,2-dichloroethane and the solution was cooled to 0° C. as it stirred under an atmosphere of N2. Triethylamine (2.3 mL, 16.58 mmol) and chloroacetyl chloride (0.92 mL, 11.60 mmol) were added sequentially. After 30 minutes, the reaction mixture was allowed to warm to ambient temperature and stirred for 3 days followed by heating to 70° C. for 2 days. The reaction mixture was allowed to cool to ambient temperature and was washed with saturated NaHCO3 solution (2×100 mL) and brine (100 mL). The organic layer was dried over Na2SO4, filtered and concentrated under reduced pressure to afford the crude product as a brown solid. Chromatography (SiO2, 20-50% ethyl acetate/hexanes) gave 1-((1S)-2{[tert-butyl(dimethyl)silyl]oxy}-1-methylethyl)-4-chloro-2-(chloromethyl)-6,7-dimethyl-1H-imidazo[4,5-c]pyridine (0.44 g) as a yellow oil.

1. temperatureto warm to ambient temperature
2. stirringstirred for 3 days
3. temperatureby heating to 70° C. for 2 days
4. temperatureto cool to ambient temperature
5. washwas washed with saturated NaHCO3 solution (2×100 mL) and brine (100 mL)
6. dry with materialThe organic layer was dried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customto afford the crude product as a brown solid

ORD record

ord-3b650a8a63f54792910abe0db04e37df

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08207162B2