Boc–Phe–Aminomalonaldehyde

The crystal structure of the title compound, (N-tert-butoxycarbonylphenylalanyl)aminomalonaldehyde {tert-butyl [1-(diformylmethylaminocarbonyl)-2-phenyl-1-ethyl]carbamate, C₁₇H₂₂N₂O₅}, was determined in order to examine the aminomalonaldehyde group in a peptide chain. The planarity constraints of the peptide bond and the aminomalonaldehyde group result in the formation of a pseudo-seven-membered ring through one intramolecular hydrogen bond (O17—H17...O11). The bond lengths in this ring indicate delocalization of π electrons and the formation of a weak conjugated π-electon system.

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