Crystal structure of N-(tert-butoxycarbonyl)glycyl-(Z)-β-bromodehydroalanine methyl ester [Boc–Gly–(β-Br)(Z)ΔAla–OMe]

The title compound, C11H17BrN2O5, is a dehydroamino acid with a C=C bond between the α- and β-C atoms. The amino acid residues are linked trans to each other and there are no strong intramolecular hydrogen bonds. The torsion angles indicate a non-helical conformation of the molecule. The dipeptide folding is influenced by an intermolecular N—H...O hydrogen bond and also minimizes steric repulsion. In the crystal, molecules are linked by strong N—H...O hydrogen bonds, generating (001) sheets. The sheets are linked by weak C—H...O and C—H...Br bonds and short Br...Br [3.4149 (3) Å] interactions