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

Acta Crystallogr Sect E Struct Rep Online. 2013 Dec 14;70(Pt 1):o38-9. doi: 10.1107/S1600536813032467. eCollection 2014 Jan 1.

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 indeno-quinoxaline 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. Intra-molecular 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⋯π inter-actions, forming a two-dimensional network along the bc plane.