Ethyl (1R1′S2′S7a’R)-2-oxo-1′-(3aR5R5aS8aS8bR)-2277-tetra­methyl­tetra­hydro-3aH-bis­13dioxolo45-b:4′5′-dpyran-5-yl-1′2′5′6′7′7a’-hexa­hydro-2H-spiro­acenaphthyl­ene-13′-pyrrolizine-2′-carboxyl­ate

摘要

In the title compound, C32H37NO8, the central pyran ring adopts a twist-boat conformation and the 1,3-dioxoane rings adopt envelope conformations. The acenaphthyl­enone unit and two C atoms of a pyrrolidine ring are disordered over two sets of sites [occupancy ratio 0.669 (7):0.331 (7)]. The major fraction of the disordered pyrrolidine ring exhibits an envelope conformation while the minor component is essentially planar [maximum deviation = 0.037 (12) Å]. The other pyrrolidine ring also adopts an envelope conformation. The dihedral angle between the mean planes of the two wings of the pyrrolidine ring is 30.6 (2)°. Both the major and minor components of the acenaphthyl­enone unit are essentially planar, the maximum deviations being 0.025 (10) and 0.047 (19) Å, respectively; the dihedral angle between the mean planes of the two components is 1.72 (3)°. The crystal packing features C—H⋯O inter­actions.