In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Aminoalkyl esters of thiazolecarboxylic acids. III. 2-Amino-6-benzothiazolecarboxylic acid, published in 1950, which mentions a compound: 2407-11-6, Name is 2-Chloro-6-nitrobenzo[d]thiazole, Molecular C7H3ClN2O2S, Electric Literature of C7H3ClN2O2S.
cf. C.A. 46, 3533c, 10150h. To 12g. 2-benzothiazolecarboxylic acid in 30 ml. concentrated H2SO4 was slowly added 9 ml. HNO3 (d. 1.35) at room temperature, the mixture kept 12 hrs. at room temperature, poured on ice, and the crude product washed with H2O, dried, taken up in concentrated H2SO4, and precipitated with H2O (ice cooling necessary), yielded 85% 6-nitro-2-benzothiazolecarboxylic acid (I) yellow, decompose 115°; Ba salt, yellow needles, does not m. 300°; NH4 salt, yellow, m. 210°; Ag salt, colorless. Heating I with absolute EtOH and concentrated H2SO4 to 50-5° gave 40% 6-nitrobenzothiazole. I heated with SOCl2 to 60-70° formed a substance, m. 187-8°, containing Cl that is unattacked by refluxing with EtOH or MeOH and identified as 2-chloro-6-nitrobenzothiazole. I and PCl5 behave similarly. Heating 13.6 g. p-H2NC6H4CO2CH2CH2NEt2HCl in 50 ml. EtOH with a triturated mixture of 13.5 g. CuCl2 and 7.6 g. NH4CNS 15 min. at 60°, and adding 40 ml. dilute HCl gave a precipitate, which was extracted repeatedly with hot H2O and the extract neutralized with NH4OH, yielding 43% 2-diethylaminoethyl 2-amino-6-benzothiazolecarboxylate, m. 155° (from EtOH); HCl salt, m. 193-4° (from EtOH). Similarly, 6.1 g. p-H2NC6H4CO2(CH2)3NEt2HCl in 50 ml. EtOH treated with 3 ml. 30% alc. HCl, 6.5 g. CuCl2, and 3.6 g. NH4CNS gave 3.7 g. 3-diethylaminopropyl 2-amino-6-benzothiazolecarboxylate, m. 146° (from dilute EtOH). Similarly was formed 60% piperidinoethyl ester, m. 186°.
As far as I know, this compound(2407-11-6)Electric Literature of C7H3ClN2O2S can be applied in many ways, which is helpful for the development of experiments. Therefore many people are doing relevant researches.
Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI