Gomes LR, Low JN, Wardell JL, de Souza MVN, da Costa CF. Crystal structure, Hirshfeld surface analysis and PIXEL calculations of a 1:1 epimeric mixture of 3-[(4-nitro-benzyl-idene)amino]-2(
R,S)-(4-nitro-phenyl)-5(
S)-(propan-2-yl)imidazolidin-4-one.
Acta Crystallogr E Crystallogr Commun 2019;
75:1774-1782. [PMID:
31709107 PMCID:
PMC6829720 DOI:
10.1107/s2056989019013938]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 10/11/2019] [Indexed: 11/10/2022]
Abstract
A 1:1 epimeric mixture of 3-[(4-nitro-benzyl-idene)amino]-2(R,S)-(4-nitro-phen-yl)-5(S)-(propan-2-yl)imidazolidin-4-one, C19H19N5O5, was isolated from a reaction mixture of 2(S)-amino-3-methyl-1-oxo-butane-hydrazine and 4-nitro-benz-alde-hyde in ethanol. The product was derived from an initial reaction of 2(S)-amino-3-methyl-1-oxo-butane-hydrazine at its hydrazine group to provide a 4-nitro-benzyl-idene derivative, followed by a cyclization reaction with another mol-ecule of 4-nitro-benzaldehyde to form the chiral five-membered imidazolidin-4-one ring. The formation of the five-membered imidazolidin-4-one ring occurred with retention of the configuration at the 5-position, but with racemization at the 2-position. In the crystal, N-H⋯O(nitro) hydrogen bonds, weak C-H⋯O(carbon-yl) and C-H⋯O(nitro) hydrogen bonds, as well as C-H⋯π, N-H⋯π and π-π inter-actions, are present. These combine to generate a three-dimensional array. Hirshfeld surface analysis and PIXEL calculations are also reported.
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