The preparation of ethyl 2‐bromothieno[2,3‐b]pyrrole‐5‐carboxylate, ethyl 2‐bromothieno[3,2‐b]pyrrole‐5‐carboxylate, ethyl 2‐nitrothieno[2,3‐b]pyrrole‐5‐carboxylate and ethyl 2‐nitrothieno[3,2‐b]pyrrole‐5‐carboxylate are described.
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Eras et al. (1984) studied this question.
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