Abstract
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.
Highlights
Structure ReportsEthyl (1R,10 S,20 S,7a’R)-2-oxo-10 [(3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyltetrahydro-3aH-bis[1,3]dioxolo[4,5-b:40 ,50 -d]pyran-5-yl]10 ,20 ,50 ,60 ,70 ,7a’-hexahydro-2H-spiro[acenaphthylene-1,30 -pyrrolizine]-20 carboxylate
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)]
Summary
Ethyl (1R,10 S,20 S,7a’R)-2-oxo-10 [(3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyltetrahydro-3aH-bis[1,3]dioxolo[4,5-b:40 ,50 -d]pyran-5-yl]10 ,20 ,50 ,60 ,70 ,7a’-hexahydro-2H-spiro[acenaphthylene-1,30 -pyrrolizine]-20 carboxylate. 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 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).
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