title: 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].
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.
authors: Post Graduate & Research Department of Physics, Agurchand Manmull Jain College, Chennai 600 114, India.
authors: T
authors: T
authors: Anuradha
authors: Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
authors: J
authors: J
authors: Naga Siva Rao
authors: Post Graduate & Research Department of Physics, Agurchand Manmull Jain College, Chennai 600 114, India.
authors: P R
authors: PR
authors: Seshadri
authors: Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
authors: R
authors: R
authors: Raghunathan