Ethyl 7'-(6-benz-yloxy-2,2-dimethyl-tetra-hydro-furo[3,2-d][1,3]dioxol-5-yl)-2-oxo-5',6',7',7a'-tetra-hydro-1'H,2H-spiro-[acenaphthyl-ene-1,5'-pyrrolo-[1,2-c][1,3]thia-zole]-6'-carboxyl-ate

Abstract

In the title compound, C(34)H(35)NO(7)S, the acenaphthyl-ene unit is essentially planar (r.m.s. deviation = 0.0335 Å). The pyrrolo-thia-zole ring system is folded about the bridging N-C bond; the thia-zolidine and pyrrolidine rings adopt S- and C-envelope conformations, respectively, with a 'butterfly' angle between the mean planes of 51.38 (10)°. The dioxolane and tetra-hydro-furan rings adopt O- and a C-envelope conformations, respectively, with a 'butterfly' angle between the mean planes of 57.12 (10)°. Two C atoms are each disordered over two positions with site-occupancy factors of 0.450 (7) and 0.550 (7). The crystal packing is stabilized by C-H⋯O inter-actions, generating an R(2) (2)(14) graph-set ring motif.

Fig. 1.

The molecular structure of the title compound with the atom numbering scheme, displacement ellipsoids are drawn at 30% probability level. H–atoms are present as small spheres of arbitary radius. The minor fractions of the disordered carbon atoms have been represented by broken bonds.

Fig. 2.

The crystal packing of the title compound viewed down c axis, showing the hydrogen bonds resulting in R22(14) graph-set ring motif. H–atoms not involved in hydrogen bonds have been excluded for clarity.