687639-03-8Relevant articles and documents
Preparation method of pramipexole intermediate 2, 6-diamino-4, 5, 6, 7-tetrahydrobenzothiazole
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Paragraph 0010; 0017-0022, (2020/02/14)
The invention discloses a preparation method of pramipexole intermediate 2, 6-diamino-4, 5, 6, 7-tetrahydrobenzothiazole. According to the method, 4-acetamido cyclohexanol is taken as a starting material, hydrobromic acid is taken as an oxidizing agent an
Industrial preparation method of 2,6-diamino-4,5,6,7-tetrahydro-benzothiazole
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Paragraph 0013; 0025-0026; 0028-0029; 0031-0032; 0034-0035, (2020/07/15)
The invention discloses a preparation method of 2,6-diamino-4,5,6,7-tetrahydro-benzothiazole suitable for industrial production, wherein 2,6-diamino-4,5,6,7-tetrahydro-benzothiazole is prepared by using p-acetamido cyclohexanone as a raw material through a one-pot method. According to the method, liquid bromine and acetic acid are not used in the production and preparation process, the 6-acetamido-2-amino-4,5,6,7-tetrahydro-benzothiazole can be prepared through a one-pot method, post-treatment operation is easy and convenient, the labor cost is saved, and the production cost is greatly reduced. The 2,6-diamino-4,5,6,7-tetrahydro-benzothiazole prepared by the method is high in yield, good in purity and suitable for industrial production.
Synthesis and identification of a new class of (S)-2,6-diamino-4,5,6,7- tetrahydrobenzo[d]thiazole derivatives as potent antileukemic agents
Prasanna,Kavitha,Raghava,Vinaya,Ranganatha,Raghavan, Sathees C.,Rangappa
scheme or table, p. 454 - 465 (2011/12/04)
Benzothiazoles are multitarget agents with broad spectrum of biological activity. Among the antitumor agents discovered in recent years, the identification of various 2-(4-aminophenyl) benzothiazoles as potent and selective antitumor drugs against different cancer cell lines has stimulated remarkable interest. Some of the benzothiazoles are known to induce cell cycle arrest, activation of caspases and interaction with DNA molecule. Based on these interesting properties of benzothiazoles and to obtain new biologically active agents, a series of novel 4,5,6,7-tetrahydrobenzo[d]thiazole derivatives 5(a-i) were synthesized and evaluated for their efficacy as antileukemic agents in human leukemia cells (K562 and Reh). The chemical structures of the synthesized compounds were confirmed by 1H NMR, LCMS and IR analysis. The cytotoxicity of these compounds were determined using trypan blue exclusion, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays. Results showed that, these compounds mediate a significant cytotoxic response to cancer cell lines tested. We found that the compounds having electron withdrawing groups at different positions of the phenyl ring of the thiourea moiety displayed significant cytotoxic effect with IC50 value less than 60 μM. To rationalize the role of electron withdrawing group in the induction of cytotoxicity, we have chosen molecule 5g (IC 50 ~15 μM) which is having chloro substitution at ortho and para positions. Flow cytometric analysis of annexin V-FITC/propidium iodide (PI) double staining and DNA fragmentation suggest that 5g can induce apoptosis. Springer Science + Business Media, LLC 2009.