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1-aryl-2-thienyl-substituted pyrroles and 5-arylamino-2,2 ́-bithiophenes were synthesized by treatment of arylamino-thieno-oxobutanamides with Lawesson ́s reagent. These in turn were prepared by direct amidation of 4-oxo-(2-thienyl)butanoic acid through DCC/BtOH mediated reactions.

Synthesis of Arylamino-thieno-oxobutanamides and Reactivity Studies on the Cyclisation with the Lawesson's Reagent