2-Amino-6-bromobenzothiazole Chemical Properties

Melting point:

213-217 °C (lit.)

Boiling point:

366.8±34.0 °C(Predicted)

Density 

1.836±0.06 g/cm3(Predicted)

storage temp. 

Keep in dark place,Inert atmosphere,Room temperature

solubility 

soluble in Methanol

pka

3.30±0.10(Predicted)

form 

Powder

color 

White

InChI

InChI=1S/C7H5BrN2S/c8-4-1-2-5-6(3-4)11-7(9)10-5/h1-3H,(H2,9,10)

InChIKey

VZEBSJIOUMDNLY-UHFFFAOYSA-N

SMILES

S1C2=CC(Br)=CC=C2N=C1N

CAS DataBase Reference

15864-32-1(CAS DataBase Reference)

NIST Chemistry Reference

2-Amino-6-bromobenzothiazole(15864-32-1)

EPA Substance Registry System

2-Benzothiazolamine, 6-bromo- (15864-32-1)

Safety Information

Hazard Codes 

Xn,Xi

Risk Statements 

22-36-43

Safety Statements 

26-36/37

WGK Germany 

3

TSCA 

Yes

HazardClass 

IRRITANT

HS Code 

29342000

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

2-Amino-6-bromobenzothiazole Usage And Synthesis

Chemical Properties

white to light yellow crystal powde

Uses

2-Amino-6-bromobenzothiazole may be used in the synthesis of the following

• 2-amino-6-arylbenzothiazole compounds:
• 6-p-tolylbenzo[d]thiazole-2-amine
• 6-(4chlorophenyl)benzo[d]thiazole-2-amine
• 6-(4-methoxyphenyl)benzo[d]thiazole-2-amine
• 6-(3,5-bis(triflouromethyl)phenyl)benzo[d]thiazole-2-amine
• 6-phenylbenzo[d]thiazole-2-amine

It may be employed as a ligand (L) in the synthesis of organometallic derivatives of Rh(I) [Rh(CO)₂(L)(Cl)].

General Description

Reaction of 4-bromoaniline with acetic acid and potassium thiocynate in solution of bromine in acetic acid yields 2-amino-6-bromobenzothiazole. 2-Amino-6-bromobenzothiazole can also be synthesized from 2-aminobenzothiazole via monobromination with silica-supported quinolinium tribromide.

Synthesis

General procedure for the synthesis of 2-amino-6-bromobenzothiazole from potassium thiocyanate and 4-bromoaniline: a solution of 4-bromoaniline (2 mmol) in acetonitrile (15 mL) was slowly added to a solution of potassium thiocyanate (8 mmol) in acetonitrile (15 mL). Subsequently, nano BF3/SiO2 catalyst (0.06 g, 30 mol% BF3) was added to the reaction system and the mixture was placed in an ice-salt bath and mechanically stirred for 30 min. A solution of bromine (4 mmol, 0.2 mL) in acetonitrile (3 mL) was slowly added through a dropping funnel, and the rate of dropping was controlled to ensure that the reaction temperature did not exceed 0 °C. After the addition of the bromine solution, the reaction was continued to be stirred at room temperature for 4 h, during which the progress of the reaction was monitored by thin layer chromatography (TLC). Upon completion of the reaction, the reaction mixture was poured into water, heated in a 70 °C water bath and then thermally filtered to remove the catalyst. The recovered catalyst was washed with acetone and reused. The filtrate was neutralized with 10% NaOH solution, the precipitate was collected by filtration, dried and recrystallized from ethanol (10 mL) to give the target product 2-amino-6-bromobenzothiazole. The product was characterized by physical and spectroscopic data and confirmed by comparison with known samples.6-Bromo-1,3-benzothiazol-2-amine (2e) was a yellow solid with 93% yield and melting point 202-204 °C (literature value 203 °C).FT-IR (KBr, cm-1 ): 3315, 3012, 2835, 1580, 1476, 1261, 920, 742, 512. 1H NMR (400 MHz, CDCl3, δ ppm): 5.44 (s, 2H, NH2), 7.4-7.5 (d, 2H, Ar-H), 7.71 (s, 1H, Ar-H). 13C NMR (100 MHz, DMSO-d6, δ ppm): 119, 120.9, 125.15, 126.07 , 133.1, 152.15, 167.75.

References

[1] Synlett, 2012, vol. 23, # 15, p. 2219 - 2222
[2] Research on Chemical Intermediates, 2016, vol. 42, # 12, p. 7855 - 7868
[3] European Journal of Medicinal Chemistry, 2008, vol. 43, # 5, p. 1114 - 1122
[4] European Journal of Medicinal Chemistry, 2012, vol. 47, # 1, p. 239 - 254
[5] European Journal of Medicinal Chemistry, 2012, vol. 53, p. 41 - 51

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