Hydrochloric Acid → N-(5-bromopyridin-3-yl)benzenesulfonamide

5-Bromo-3-pyridinamine (5 g) was dissolved in pyridine (150 ml) and the reaction was cooled to 0° C. in an ice-bath and stirred for 5 min. Benzenesulfonyl chloride (1.86 ml) was added dropwise and the reaction was stirred at 0° C. for 3 hr. Further benzenesulfonyl chloride (1.86 ml) was added and the reaction continued stirring for 1 hr. The reaction was neutralised with 2 M HCl and extracted with DCM (60 ml) then evaporated to dryness. The residue was dissolved in DCM and preadsorbed on fluorosil then purified by column chromatography on silica, eluting with 1-5% MeOH/DCM, to give the title compound (8 g).

1. stirringthe reaction was stirred at 0° C. for 3 hr
2. stirringthe reaction continued stirring for 1 hr
3. extractionextracted with DCM (60 ml)
4. customthen evaporated to dryness
5. dissolutionThe residue was dissolved in DCM
6. customthen purified by column chromatography on silica
7. washeluting with 1-5% MeOH/DCM

ORD-Eintrag

ord-70354769617245258533d00922bef3e1

Quelldatensatz

uspto-grants-2012_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08163743B2