Thiophene is a five-membered heterocyclic compound containing a sulfur heteroatom with the molecular formula C4H4S. Thiophene is aromatic and is very similar to benzene; electrophilic substitution reaction is easier than benzene, and it is mainly substituted at the 2-position. Thiophene ring system has certain stability to oxidant.
Potent IRAK-4 inhibitors have been reported by several groups including some structurally related benzimidazoles as well as alternative fused heterocycles such as the imidazopyridine and imidazopyridazine. Such compounds are reported to have IRAK-1 and IRAK-4 activity with varying degrees of selectivity.
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