2-BROMO-6-BENZOTHIAZOLECARBOXYLIC ACID Chemical Properties

Melting point:

232-233℃ (dec.)

Boiling point:

444.1±37.0 °C(Predicted)

Density 

1.912

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

pka

3.55±0.30(Predicted)

Appearance

Off-white to light brown Solid

Safety Information

HS Code 

2934208090

2-BROMO-6-BENZOTHIAZOLECARBOXYLIC ACID Usage And Synthesis

Synthesis

General procedure for the synthesis of 2-bromobenzothiazole-6-carboxylic acid from methyl 2-aminobenzothiazole-6-carboxylate: to a mixed solution of methyl 2-bromobenzothiazole-6-carboxylate (1.256 g, 4.39 mmol) in tetrahydrofuran (THF, 60 mL) and water (H2O, 20 mL) was added at 0 °C lithium hydroxide monohydrate (920 mg, 21.9 mmol). The reaction mixture was stirred at room temperature overnight. Upon completion of the reaction, the pH was adjusted to 2 with 1N hydrochloric acid (HCl) solution, followed by extraction with ethyl acetate. After the organic phase was washed with saturated saline, the solvent was removed by distillation under reduced pressure, and the crude product obtained could be used directly in the next step of the reaction without further purification. Mass Spectrometry (ESI) m/z: 257.9 (M + 1)+.

References

[1] Patent: WO2008/124393, 2008, A1. Location in patent: Page/Page column 33-34

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