Dichloromethane → 3-Bromo-5-(((tert-butyldimethylsilyl)oxy)methyl)pyridine

To a methylene chloride solution (20 mL) of 3-bromo-5-(hydroxymethyl)pyridine hydrochloride (described in example 69a) (1.00 g, 4.48 mmol) under nitrogen was added triethylamine (2.50 mL, 17.9 mmol, 4 eq) and tert-butyldimethylsilyl chloride (0.75 g, 5.0 mmol, 1.1 eq). The resulting solution was heated to reflux for 18 h, cooled to room temperature and diluted with diethyl ether (200 mL). The organic phase was washed with 2.5N NaOH (1×100 mL), water (3×100 mL) and saturated brine (1×100 mL). The ether solution was dried over anhydrous magnesium sulfate, filtered, and reduced to an colorless oil. The procedure resulted in 1.10 g (81%) of the title compound. The product required no additional purification. TLC analysis (Rf 0.19, ethyl acetate) MS (CI, CH4) m/z 302 (M+1,100), 304 (96), 330 (M+29,4), 332 (4)

1. temperatureThe resulting solution was heated
2. temperatureto reflux for 18 h
3. washThe organic phase was washed with 2.5N NaOH (1×100 mL), water (3×100 mL) and saturated brine (1×100 mL)
4. dry with materialThe ether solution was dried over anhydrous magnesium sulfate
5. filtrationfiltered

ORD-Eintrag

ord-15b1e80b41d048c58a1692b4aa85ca54

Quelldatensatz

uspto-grants-1997_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05681840