H. Weber, P. Ettmayer, M. Hübner
Oct 15, 1995
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Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The title compound, tert-butyl {1(S)-[(3R,4S,5S)-5-benzyl-4-hydroxy-2-oxo-3-pyrrolidinyl]-2-phenylethyl} -carbamate, C24H30N204, is an example of an all-cis trisubstituted pyrrolidin-2-one. The absolute configurations of the C atoms in the lactam ring were assigned to be 3R, 4S and 5S relative to the known chirality, 1S, of the C α atom of the L-phenylalanine fragment in the compound. There is one intramolecular hydrogen bond between the pyrrolidin-2-one carbonyl O atom and the N-H group of the L-phenylalanine fragment [N-H...O 2.936(5)A].