Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 10 (October 2013)

organic compounds

Acta Cryst. (2013). E69, o1517-o1518    [ doi:10.1107/S1600536813024586 ]

Ethyl 1'-methyl-2-oxo-4'-[(3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetra­methyl­tetra­hydro-3aH-bis­[1,3]dioxolo[4,5-b:4',5'-d]pyran-5-yl]-2H-spiro­[ace­naphthyl­ene-1,2'-pyrrolidine]-3'-carboxyl­ate

G. Jagadeesan, K. Sethusankar, R. Prasanna and R. Raghunathan

Abstract: In the title mol­ecule, C30H35NO8, the ace­naphthyl­enone moiety, two atoms of a methyl pyrrolidine ring (N and C atoms) and four atoms of an ethyl acetate moiety (two C and two O atoms) are disordered over two sets of sites in ratio 0.532 (7):0.468 (7). The three C atoms of a di­meth­oxy­ethane ring and dioxolane ring attached with two methyl groups are disordered over two sets of sites in 0.66 (2):0.34 (2) and 0.62 (2):0.38 (2) ratios, respectively. The major and minor components of the ace­naphthyl­ene ring are essentially planar (r.m.s. deviations = 0.0254 and 0.0436 Å, respectively). The major and minor components of the pyrrolidine ring adopt C-envelope conformations with C atoms displaced by 0.492 (11) and 0.595 (7) Å from the remaining ring atoms. One of the dioxolane rings is disordered with its major component in an envelope conformation [C displaced by 0.511 (11) Å] and the minor fraction is more or less planar with an r.m.s. deviation of 0.070 Å. The other dioxolane ring is in an envelope conformation, with a C atom displaced by 0.438 (3) Å from the remainder of the ring atoms. The crystal packing features C-H...O inter­actions, which generate C(9) chains.

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