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Abstract
A convenient one-pot cyclocondensation method for benzothiazole and benzimidazole syntheses is described. A set of benzothiazoles and benzimidazoles were readily prepared from aromatic ortho-diamines or ortho-aminothiophenol and aldehydes using chlorotrimethylsilane in dimethylformamide as promoter and water scavenger under ultrasonic irradiation in good yields (84–97%).
ACKNOWLEDGMENTS
This work was funded by the Natural Science Foundation of Zhejiang Province, China (Project Y407240) and Key project of Lishui University.
Notes
a Reaction conditions: The reactions were performed with aldehyde (1 mmol) and 2-aminothiophenol (1 mmol) in DMF for 30 min under ultrasonic irradiation.
b Yields refer to pure isolated products.
a Reaction conditions: The reactions were performed with aldehyde (1 mmol) and 2-aminothiophenol (1 mmol) in DMF for 30 min under ultrasonic irradiation.
b Without using ultrasound irradiation.
c Yields refer to pure isolated products.