Crystal structures of N-benzylcarbonyl-α-aminoisobutyric acid mono- and tripeptide methyl ester derivatives
Abstract
The crystal structures of N-benzylcarbonyl-α-aminoisobutyric acid methyl ester (1) and N-benzylcarbonyl-α-aminoisobutyryl-α-aminoisobutyryl-α-aminoisobutyric acid methyl ester (2) have been determined by X-ray diffraction techniques. The compounds possess the following parameters: (1) orthorhombic, space group Pbca (No. 61), a = 20.124(3) Å, b = 9.497(1) Å, c = 13.825(2) Å, and Z = 8; (2) orthorhombic, Fdd2 (No. 43), a = 31.454(3) Å, b = 34.132(3) Å, c = 8.448(1) Å, and Z = 16. The crystal structures were solved by direct methods. The least-squares refinements led to R values of 0.061 and 0.057 for 1112 and 1131 reflections with I ⩾ 3σ(I) for (1) and (2), respectively. The conformation of the N- and C-blocking groups is similar in the two compounds. However, the conformation of the Aib residue in (1) is semi-extended, while those of the three Aib residues in (2) are helical.
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Artikel in diesem Heft
- Limits of isomorphous substitution of CnH2n + 2 chains in paraffins as a function of temperature
- Crystal structure analysis from powder diffraction data
- Intensitätsstatistik für Strukturen mit Überstruktureffekten
- Crystal and molecular structure of 10-methoxy-8, 8-dimethyl 2H,8H-benzo (1,2-b:5,4-b′-dipyron-2-one) (Luvangetin)
- Crystal structure of a complex of glycine with zinc chloride
- Ratio image seeking with multiple-wavelength X-ray diffraction data
- Verfeinerung der Kristallstruktur von Anthophyllit vom Ochsenkogel/Gleinalpe, Österreich
- Präzisionsbestimmung des Skalierungsfaktors für Relativwerte von Strukturamplituden mit Messung von Absolutintensitäten an Pulverpräparaten
- The X-ray revised stereochemistry of the hydroperoxide of atractyligenin
- Crystal structures of N-benzylcarbonyl-α-aminoisobutyric acid mono- and tripeptide methyl ester derivatives
- The crystal structure of U4Ni5Al18
- The crystal structure of Cs2Nd(N3)5
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