The condensation of 3-nitro-5-carboxy-2-methylthiophene with acetals of amides proceeds smoothly, and further ammonium formate–Pd/C reduction of nitroenamines thus obtained affords 2-carboxythieno-(5-R)-[3,2-b]pyrroles (R = H, Me) in good yields.
A novel approach to 4H-thieno[3,2-b]pyrroles
M. M. Krayushkin, F. M. Stoyanovich and S. V. Shorunov, Mendeleev Commun., 2004, 14, 29 DOI: 10.1070/MC2004v014n01ABEH001877
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