2-tert-Butoxycarbonylamino-2-isopropyl-4-pentenamide, a new conformationally restricted α,α-dialkylglycine derivative

The α-allyl-α-isopropylglycine derivative, C 13 H 24 N 2 O 3 , adopts a fully extended C 5 conformation. The φ and ψ torsion angles are close to the expected values of 180°. The amide C=O group plays the role of a double acceptor, namely, of an intramolecular hydrogen bond with the urethane N-H group, and of an intermolecular hydrogen bond with the amide N-H group of a symmetry-related molecule (2 - x, -y, -z).