Dimethyl Disulfide → 2-Bromo-5-(methylthio)pyridine

To a solution of 2,5-dibromopyridine (23.4 g, 0.099 mol) in ether (500 mL), n-butyl lithium (1.52 M in n-hexane, 68 mL, 0.10 mmol) was added dropwise at −78° C. and the mixture was stirred for 1 hour at the temperature. Dimethyldisulfide (9.8 mL, 0.11 mol) was added slowly at −78° C. and the mixture was stirred for 1 hour at that temperature and further 1 hour at 0° C. The mixture was quenched with aqueous 1 N hydrochloric acid (200 mL) and extracted with ether (100 mL×2), dried over magnesium sulfate (MgSO4), and concentrated in vacuo gave the title compound (18.9 g, 94%).

1. stirringthe mixture was stirred for 1 hour at that temperature and further 1 hour at 0° C
2. customThe mixture was quenched with aqueous 1 N hydrochloric acid (200 mL)
3. extractionextracted with ether (100 mL×2)
4. dry with materialdried over magnesium sulfate (MgSO4)
5. concentrationconcentrated in vacuo

ORD record

ord-2f1358730def43ccbc04d8c5de0f5b89

Source dataset

uspto-grants-2005_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06878726B2