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Rac-(4aR,8aR)-2,3-Diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline.

ABSTRACT: The structure of the title racemic compound, C(20)H(20)N(2), shows close similarity to that of the enanti-omerically pure (4aR,8aR)-2,3-diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline [Wang & Ye (2008 ?). Acta Cryst. E64, o359-o359]. The similarity applies to the unit-cell parameters as well as to the packing of the constituent mol-ecules. Similar packing is conditioned by a lack of directed inter-molecular inter-actions such as hydrogen bonds in either structure.

SUBMITTER: Chen F

PROVIDER: S-EPMC2961730 | biostudies-literature | 2008 Jun

REPOSITORIES: biostudies-literature

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rac-(4aR,8aR)-2,3-Diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline.

Chen Fang F Ye Heng-Yun HY

Acta crystallographica. Section E, Structure reports online 20080607 Pt 7

The structure of the title racemic compound, C(20)H(20)N(2), shows close similarity to that of the enanti-omerically pure (4aR,8aR)-2,3-diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline [Wang & Ye (2008 ▶). Acta Cryst. E64, o359-o359]. The similarity applies to the unit-cell parameters as well as to the packing of the constituent mol-ecules. Similar packing is conditioned by a lack of directed inter-molecular inter-actions such as hydrogen bonds in either structure. ...[more]

PMID: 21202833

Similar Datasets

(4aR,8aR)-2,3-Diphenyl-4a,5,6,7,8,8a-hexa-hydro-quinoxaline.

Project description:The title mol-ecule, C(20)H(20)N(2), is chiral; the absolute configuration follows from the known chirality of the input reagents. In addition to van der Waals forces, C-H⋯π ring inter-actions are also present. The angle between the planes of the phenyl rings is 65.6 (1)°. The heterocyclic ring of the quinoxaline system has a twist-boat configuration, while the cyclohexane ring has a chair configuration.

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(±)-(4aR,5R,8S,8aR)-8-(tert-Butyl-dimethyl-sil-yloxy)-2,5,8a-trimethyl-4a,5,8,8a-tetra-hydro-naphthalene-1,4-dione.

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Crystal structure and features of 3',8-di-benzyl-idene-4a,5,6,7,8,8a-hexa-hydro-2'<i>H</i>-spiro-[chromene-2,1'-cyclo-hexa-n]-2'-one.

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Synthesis and crystal structure of (2S,4aR,8aR)-6-oxo-2,4a,6,8a-tetra-hydro-pyrano[3,2-b]pyran-2-carboxamide.

Project description:The pyran-opyran amide (2S,4aR,8aR)-6-oxo-2,4a,6,8a-tetra-hydro-pyrano[3,2-b]pyran-2-carboxamide, C9H9NO4, 3, was prepared by a chemoselective hydration of the corresponding nitrile, 2, using a heterogeneous catalytic method based on copper(II) supported on mol-ecular sieves, in the presence of acetaldoxime. Compound 3 belongs to a new class of pyran-opyrans that possess anti-bacterial and phytotoxic activity. Crystallographic analysis of 3 shows a bent structure for the cis-fused bicyclic pyran-opyran, similar to nitrile 2. Evidence of an intra-molecular hydrogen bond involving the amide group and ring oxygen was not observed; however, two separate inter-molecular hydrogen-bonding inter-actions were observed between the amide hydrogen atoms and adjacent carbonyl oxygen atoms along the b- and a-axis directions. The latter inter-action may also be supported by an inter-molecular C-H?O hydrogen bond. The lattice is filled out by close-packed layers of this hydrogen-bonded network along the c-axis direction, related from one to the next by a 21 screw axis.

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