(8aS)-7,8,8a,9-Tetra-hydro-thieno[3,2-f]indolizin-6(4H)-one

(5S,11aS)-5-Hydro-per-oxy-1,5,11,11a-tetra-hydro-[1]benzothieno[3,2-f]indol-izin-3(2H)-one

The absolute configuration of the title compound, C₁₄H₁₃NO₃S, was assigned from the synthesis and confirmed by the structure determination. The central six-membered ring of the indolizine moiety adopts an envelope conformation, with the greatest deviation from the mean plane of the ring being 0.661 (2) Å for the bridgehead C atom. The benzothiene ring attached to the indolizine ring system is planar to within 0.008 (2) Å. In the crystal, mol­ecules form chains parallel to the b axis via O—H⋯O hydrogen bonds.

12-(4-Meth-oxy-benzo-yl)-2-methyl-benzo[f]pyrido[1,2-a]indole-6,11-dione

In the title compound, C(25)H(17)NO(4), the indolizine fused naphthaquinone unit is approximately planar [r.m.s deviation = 0.0678 Å] and makes a dihedral angle of 57.82 (5)° with the benzene ring of the meth-oxy-benzene group. The naphtho-quinone O atoms deviate, in the same sense, from the mean plane of the fused six-membered rings by 0.2001 (14) and 0.0516 (14) Å. In the crystal there is π-π stacking of inversion-related pairs of mol-ecules [inter-planar spacing = 3.514 (2) Å].