6a-Nitro-6-(2,2,7,7-tetra­methyl­tetra­hydro-3aH-bis­[1,3]dioxolo[4,5-b:4′,5′-d]pyran-5-yl)-6a,6b,7,8,9,11a-hexa­hydro-6H-spiro­[chromeno[3,4-a]pyrrolizine-11,11′-indeno­[1,2-b]quinoxaline]

In the title compound, C₃₉H₃₈N₄O₈, the quinoxaline and indene subunits are essentially planar, with maximum deviations of 0.071 (2) and 0.009 (2) Å, respectively. The indeno­quinoxaline system forms a dihedral angle of 72.81 (3)° with the chromenopyrrolizine system. The two dioxolane rings, as well as the pyran ring of the chromeno group and the terminal pyrrolizine, each adopt an envelope conformation with O and C as flap atoms. The central pyrrolizine ring adopts a twisted conformation. Intra­molecular C—H...O and C—H...N hydrogen bonds occur. The crystal structure exhibits C—H...O hydrogen bonds, and is further stablized by C—H...π inter­actions, forming a two-dimensional network along the bc plane.

Crystal structures of ethyl (2S*,2′R*)-1′-methyl-2′′,3-dioxo-2,3-di­hydro­dispiro­[1-benzo­thio­phene-2,3′-pyrrolidine-2′,3′′-indoline]-4′-carboxyl­ate and ethyl (2S*,2′R*)-5′′-chloro-1′-methyl-2′′,3-dioxo-2,3-di­hydro­dispiro­[1-benzo­thio­phene-2,3′-pyrrolidine-2′,3′′-indoline]-4′-carboxyl­ate

The title compounds, (I) and (II), are di­spiro-indole-pyrrolidine-benzo­thio­phene derivatives, with (II) having a chlorine substituent on the oxo­indole unit. As a result, the conformation of the two mol­ecules differs in the angle of inclination of the indole moiety with respect to the benzo­thio­phene ring system, with a dihedral angle of 71.59 (5) in (I) and 82.27 (7)° in (II).

Methyl (2Z)-2-[(2-formyl-3-methyl-1H-indol-1-yl)meth­yl]-3-(4-meth­oxy­phen­yl)prop-2-enoate

In the title indole derivative, C₂₂H₂₁NO₄, the dihedral angle between the benzene and pyrrole rings of indole moiety is 1.8 (1)°. The plane of the 4-meth­oxy­phenyl ring is oriented with a dihedral angle of 60.7 (1)° with respect to the plane of the indole moiety. The mol­ecular packing is stabilized by C—H...O hydrogen bonds which form a V-shaped chain arrangement along the bc plane of the unit cell. In addition to this, C—H...π and π–π inter­actions [centroid–centroid distances = 3.8102 (11) and 3.8803(12) Å], which run along the b-axis direction, stabilize the mol­ecular packing.