6′-(3-Bromophenyl)-7′-nitro-1′,6′,7′,7a'-tetrahydro-3′H-spiro[indeno[1,2-b]quinoxaline-11,5′-pyrrolo[1,2-c]thiazole]

Abstract

The title compound, C26H19BrN4O2S, crystallizes in a monoclinic C-centred lattice with eight molecules in the unit cell. The five-membered thiazole and pyrrolidine rings adopt envelope conformations and the bromophenyl and indenoquinoxaline planes are oriented at a dihedral angle of 61.6 (1)° to each other. The molecular structure features an intramolecular C—H...N interaction leading to an S(6) ring motif. C(9) and C(10) chains along the c- and b-axis directions form through C—H...Br and C—H...S contacts, respectively. In addition, C—H...O and C—H...N hydrogen bonds form inversion dimers with R22(10) and R22(14) motifs, respectively. One O atom is disordered over two positions (occupancy ratio 0.63:0.37).

Keywords

• crystal structure
• spiro compound
• quinoxaline
• thiazole
• bromophenyl