1-Meth­yl-6,7-dihydro­pyrrolo[2,3-c]azepine-4,8(1H,5H)-dione

The title compound, C₉H₁₀N₂O₂, was synthesized by cyclization of 3-(1-methyl­pyrrole-2-carboxamido)propanoic acid in the presence of phospho­rus oxychloride. Inter­molecular N—H...O hydrogen bonds generate a one-dimensional chain in the crystal structure.

3-(4-Bromo-1H-pyrrole-2-carbox­amido)­propanoic acid

The title compound, C₈H₉BrN₂O₃, was synthesized by condensation of β-alanine methyl ester with 4-bromo-2-(tri­chloro­acetyl)­pyrrole, followed by saponification and acidification. In the mol­ecule, all bond lengths and angles are normal. The crystal packing is stabilized by intermolecular N—H...O and O—H...O hydrogen bonds.

3-[(4-Bromo-1-methyl-1H-pyrrol-2-yl­carbonyl)­amino]­propanoic acid

The title compound, C₉H₁₁BrN₂O₃, was synthesized by condensation of β-alanine methyl ester with 4-bromo-1-methyl-2-(tri­chloro­acetyl)­pyrrole at room temperature. In the crystal structure, intermolecular N—H...O and O—H...O hydrogen-bond interactions link the mol­ecules into extended ribbons parallel to the a axis.