Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 12 (December 2013)


organic compounds



zs2277 scheme

Acta Cryst. (2013). E69, o1764    [ doi:10.1107/S1600536813029826 ]

(4'-Acet­yloxy-1,3,1'-trioxo-1,3,4,4a,4b,5,6,7,9,9a-deca­hydro­spiro­[indene-2,9'-pyrano[4,3-a]pyrrolizin]-3'-yl)methyl acetate

N. Latha, J. Naga Siva Rao, R. Raghunathan, G. Divya and S. Lakshmi

Abstract: In the title compound, C23H23NO8, the dihedral angle between the five- and six-membered rings of the indene-dione moiety is 3.09 (13)°. The mean plane of the five-membered ring (which has a flat envelope conformation with the spiro C atom as the flap) is inclined to the mean plane of the central five-membered ring of the pyrrolizine unit by 76.48 (12)°. This central ring has a twist conformation on the N-C(spiro) bond. The outer ring of the pyrrolizine unit has an envelope conformation with the N atom as the flap. The mean planes of these two fused rings are inclined to one another by 65.28 (15)°. The pyran ring has a screw-boat conformation and its mean plane makes a dihedral angle of 29.50 (11)° with the mean plane of the central five-membered ring of the pyrrolizine unit. In the crystal, mol­ecules are linked via C-H...O hydrogen bonds, forming two-dimensional networks lying parallel to the ab plane.


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