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Acta Cryst. (2014). E70, o38-o39  [ doi:10.1107/S1600536813032467 ]

6a-Nitro-6-(2,2,7,7-tetra­methyl­tetra­hydro-3aH-bis­[1,3]dioxolo[4,5-b:4',5'-d]pyran-5-yl)-6a,6b,7,8,9,11a-hexa­hydro-6H-spiro­[chromeno[3,4-a]pyrrolizine-11,11'-indeno­[1,2-b]quinoxaline]

T. Anuradha, J. Naga Siva Rao, P. R. Seshadri and R. Raghunathan

Abstract: In the title compound, C39H38N4O8, the quinoxaline and indene subunits are essentially planar, with maximum deviations of 0.071 (2) and 0.009 (2) Å, respectively. The indeno­quinoxaline system forms a dihedral angle of 72.81 (3)° with the chromenopyrrolizine system. The two dioxolane rings, as well as the pyran ring of the chromeno group and the terminal pyrrolizine, each adopt an envelope conformation with O and C as flap atoms. The central pyrrolizine ring adopts a twisted conformation. Intra­molecular C-H...O and C-H...N hydrogen bonds occur. The crystal structure exhibits C-H...O hydrogen bonds, and is further stablized by C-H...[pi] inter­actions, forming a two-dimensional network along the bc plane.


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