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Main observation and conclusionrnA convenient synthetic route to 2-heteroaryl-3-hydroxybenzo[b]thiophene derivatives via K2CO3-promoted multicomponent cycliza-tion between o-halogenated benzaldehyde,2-methylquinolines and sulfur powder has been demonstrated.This reaction is per-formed smoothly under simple conditions to give the corresponding products in moderate to good yields.The resultant 3-hydroxybenzo[b]thiophenes have been proved to be versatile building blocks in a range of transition-metal-catalyzed cross-coupling reactions.