8-BROMO-1,6-NAPHTHYRIDINE

8-BROMO-1,6-NAPHTHYRIDINE Property

Boiling point:

312.0±22.0 °C(Predicted)

Density 

1.656±0.06 g/cm3(Predicted)

storage temp. 

Storage temp. 2-8°C

pka

1.45±0.30(Predicted)

Appearance

Off-white to light yellow Solid

CAS DataBase Reference

17965-74-1

Safety

HS Code 

2933998090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H302Harmful if swallowed

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

8-BROMO-1,6-NAPHTHYRIDINE Chemical Properties,Usage,Production

Synthesis

1. Carbon tetrachloride (35 mL) solution of bromine (2.25 mL, 43.7 mmol) was added dropwise to carbon tetrachloride (200 mL) solution of 1,6-naphthyridine (4.73 g, 36.4 mmol) under stirring conditions through a charging funnel. 2. The reaction mixture was heated to reflux for 1 hour. 3. Under reflux conditions, slowly add a dropwise solution of pyridine (2.94 mL, 36.4 mmol) in carbon tetrachloride (30 mL) to the reaction mixture and continue refluxing overnight. 4. Upon completion of the reaction, the reaction mixture was cooled and filtered. 5. Digest the solid with 1 M sodium hydroxide solution (200 mL) for 1 hour. 6. The basic aqueous phase was extracted with dichloromethane (2 x 200 mL), the organic phases were combined, dried over anhydrous sodium sulfate and concentrated. 7. The oil obtained was purified by column chromatography (eluent: 10% ethyl acetate/dichloromethane) to afford 8-bromo-1,6-naphthyridine (2.03 g, 27% yield) as yellow crystals with a melting point of 79-81°C. The solid was extracted with sodium hydroxide solution (2 x 200 mL) for 1 hour.

References

[1] Chemical & Pharmaceutical Bulletin, 1986, vol. 34, # 5, p. 2018 - 2023
[2] Patent: EP1147083, 2004, B1. Location in patent: Page 47
[3] Synthesis, 2007, # 8, p. 1185 - 1196