Studies with condensed aminothiophenes: Further investigation on the reactivity of condensed aminothiophenes toward electron poor and acetylenes under microwave heating

Abstract magnified image The reaction of aminothienopyridazines 8a,b, aminothienocoumarin 13 and aminothienonaphthopyran 14 with enaminones 9, 17 and 20a,b under microwave irradiation affords either a mixture of both condensations C‐1 alkylation products 15 and 16 or amino moiety alkylation and diethylamine elimination or only one of these products depending on nature of substituents on the thiophene ring. On the other hand reaction of these condensed aminothiophenes with 3‐dimethylaminoacrylaldehyde afforded 24 and 25.