5-METHOXY-1H-INDAZOLE

5-METHOXY-1H-INDAZOLE Property

Melting point:

167 °C(Solv: benzene (71-43-2))

Boiling point:

312.5±15.0 °C(Predicted)

Density 

1.244±0.06 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

pka

13.61±0.40(Predicted)

Appearance

Light yellow to yellow Solid

InChI

InChI=1S/C8H8N2O/c1-11-7-2-3-8-6(4-7)5-9-10-8/h2-5H,1H3,(H,9,10)

InChIKey

GZWWDKIVVTXLFL-UHFFFAOYSA-N

SMILES

N1C2=C(C=C(OC)C=C2)C=N1

Safety

Risk Statements 

22-41

Safety Statements 

26-39

HS Code 

29339900

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.

5-METHOXY-1H-INDAZOLE Chemical Properties,Usage,Production

Chemical Properties

Yellow solid

Synthesis

General procedure for the synthesis of 5-methoxy-1H-indazole using 2-methyl-4-methoxyaniline as starting material: aqueous (8.1 ml) solution of sodium nitrite (3.38 g, 49.0 mmol) was slowly added dropwise to acetic acid (350 ml) solution of 4-methoxy-2-methylaniline (6.69 g, 48.8 mmol) under ice-water bath conditions. The temperature was strictly controlled not to exceed 25°C during the reaction, followed by continuous stirring at room temperature overnight. After completion of the reaction, the reaction mixture was poured into water and extracted with chloroform. The organic layers were combined, washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure and the resulting crude product was purified by silica gel column chromatography (eluent ratio of chloroform/methanol=9/1) to give 5-methoxy-1H-indazole (1.30 g, 18% yield). The product was characterized by 1H-NMR (DMSO-d6) and the chemical shifts δ were 3.76 (3H, s), 6.98 (1H, dd, J=8.8,1.8 Hz), 7.15 (1H, d, J=1.8 Hz), 7.42 (1H, d, J=8.8 Hz), 7.93 (1H, s), and 12.89 (1H, brs).

References

[1] Patent: EP1403255, 2004, A1. Location in patent: Page 44
[2] Bulletin of the Chemical Society of Japan, 1985, vol. 58, # 1, p. 309 - 315
[3] Bioorganic and Medicinal Chemistry Letters, 2005, vol. 15, # 23, p. 5293 - 5297
[4] Bioorganic and Medicinal Chemistry Letters, 2001, vol. 11, # 9, p. 1153 - 1156
[5] Bioorganic and Medicinal Chemistry Letters, 2011, vol. 21, # 8, p. 2410 - 2414