4H-Thieno[3,4-c]pyrrole (4) was synthesised from the azide (8) by intramolecular 1,3-dipolar cycloaddition followed by acid-catalysed 1,3-dipolar cycloreversion of the dihydrotriazole intermediate (9); the crystal structure of one of the products formed on trapping (4) with N-phenylmaleimide has been determined.
C. Sha, C. Tsou and S. Wang, J. Chem. Soc., Chem. Commun., 1988, 320 DOI: 10.1039/C39880000320
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