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4-(2-Benzyl­amino-1-oxoethyl)-1,2,3,4-tetra­hydro-6,7-di­methyl­quinoxalin-2-one

✍ Scribed by Kruszynski, Rafal ;Bartczak, Tadeusz J. ;Mikiciuk-Olasik, Elżbieta

Publisher
International Union of Crystallography
Year
2002
Tongue
English
Weight
416 KB
Volume
58
Category
Article
ISSN
1600-5368

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✦ Synopsis

The heterocycle of the quinoxalinone system exhibits a half-chair conformation. The value of the total puckering amplitude Q T is 0.391 (5) A Ê . The benzylaminomethyl part of the side branch is close to planar. This weighted-least-squares plane makes a dihedral angle of 67.45 ( 14) with the quinoxalinone plane. In the structure, there are CÐHÁ Á ÁN and CÐHÁ Á ÁO intramolecular hydrogen bonds. The molecules are held together by NÐHÁ Á ÁO intramolecular hydrogen bonds, resulting in a dimeric structure. The dimers are linked by weak CÐHÁ Á ÁO intermolecular hydrogen bonds, resulting in a three-dimensional layered hydrogen-bonded network.

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All interatomic distances of the title compound, C 17 H 17 N 3 O 2 , are normal. The phenyl ring of the benzylaminomethyl substituent is disordered over two positions. The heteroatom ring of the quinoxolinone system shows a half-chair conformation. The molecules are held together by intermolecular N

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All the interatomic distances in the title compound, C 22 H 25 N 3 O 4 , are normal. The heteroatom ring of the quinoxalinone system shows a half-chair conformation, slightly distorted towards a sofa. In the crystal structure, the molecules dimerize via a pair of N-HÁ Á ÁO hydrogen bonds. The dimers