5-BROMO-2-METHYLINDOLE Chemical Properties

Melting point:

104-107 °C (lit.)

Boiling point:

147-148 °C(Press: 4 Torr)

Density 

1.4916 g/cm3

storage temp. 

Keep in dark place,Inert atmosphere,Room temperature

pka

16.61±0.30(Predicted)

form 

Powder

color 

Yellow to pink to tan

CAS DataBase Reference

1075-34-9(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

HS Code 

2933998090

MSDS

• Language:English Provider:SigmaAldrich

5-BROMO-2-METHYLINDOLE Usage And Synthesis

General Description

5-Bromo-2-methylindole, a bromoalkylindole derivative, has been reported to be prepared by the bromination of 2-methylindole and characterized by ¹H NMR.

Synthesis

Step 1. Synthesis of 5-bromo-2-methyl-7H-indole: To a solution of 2-methyl-1H-indole (5.0 g, 38.12 mmol) in sulfuric acid (80 mL) was added Ag2SO4 (12.5 g, 40.06 mmol) under cooling in an ice bath and stirred for 30 min. Subsequently, Br2 (6.4 g, 40.05 mmol) was slowly added dropwise over 30 minutes. After the dropwise addition, the reaction mixture was continued to be stirred at room temperature for 4 hours. Upon completion of the reaction, the reaction was quenched by the addition of a water/ice mixture (300 mL). The reaction mixture was extracted with dichloromethane (3 x 200 mL), the organic layers were combined, dried over anhydrous sodium sulfate, and concentrated under reduced pressure to afford 5-bromo-2-methyl-7H-indole as a light brown solid (6 g). The product was detected by LC-MS: [M+H]+ m/z 211.0. 1H-NMR (300MHz, CDCl3) δ: 11.23 (s, 1H), 7.56 (s, 1H), 7.21 (d, J=8.7Hz, 1H), 7.07-7.09 (m, 1H), 6.11 (s, 1H), 2.38 (s, 3H).

References

[1] Patent: WO2012/119046, 2012, A2. Location in patent: Page/Page column 161
[2] Patent: US2012/225863, 2012, A1. Location in patent: Page/Page column 28

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