Ethyl (1R,1'S,2'S,7a'R)-2-oxo-1'-[(3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetra-methyl-tetra-hydro-3aH-bis-[1,3]dioxolo[4,5-b:4',5'-d]pyran-5-yl]-1',2',5',6',7',7a'-hexa-hydro-2H-spiro-[acenaphthyl-ene-1,3'-pyrrolizine]-2'-carboxyl-ate.

ABSTRACT: In the title compound, C(32)H(37)NO(8), the central pyran ring adopts a twist-boat conformation and the 1,3-dioxoane rings adopt envelope conformations. The acenaphthyl-enone 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 acenaphthyl-enone 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 inter-actions.

SUBMITTER: Jagadeesan G 

PROVIDER: S-EPMC3275060 | biostudies-literature | 2012 Feb

REPOSITORIES: biostudies-literature