Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 86, Issue 9, Pages 6056-6065Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.0c02542
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- CSIR, New Delhi
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Benzimidazol-amino thiazoles were synthesized under microwave irradiations using benzimidazole phenyl thiourea and 2-bromoacetophenone. Bifunctional hydrogen bonding played an important role in chemical conversion, and the synthesized products showed interesting anticancer activities for human lung cancer.
Benzimidazol-amino thiazoles are synthesized under microwave irradiations using benzimidazole phenyl thiourea and 2-bromoacetophenone. Bifunctional hydrogen bonding plays an important role in chemical conversion. The reaction was carried out by C-C bond formation, followed by C-N bond cleavage and simultaneous migration of the benzimidazole ring. This reaction is novel and efficient for the synthesis of benzimidazol-amino thiazoles in which microwaves were used as driving forces. Synthesis of the product was controlled by double hydrogen bonding which is practically confirmed by the synthesis of routine imino-thiazole as an alternative product in the simple acidic condition. The simple acidic condition is neither responsible nor sufficient for optimum conversion of the benzimidazole migrated product. The synthesized products benzimidazole amino thiazoles D4 (IC50 = 4.207 mu M) and D8 (IC50 = 2.398 mu M) show interesting anticancer activities for human lung cancer with reference to doxorubicin (IC50 = 1.750 mu M).
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