1-Benzyl-3-methyl-3',5'-diphenyl­spiro­[quinoxaline-2(1H),2'(3'H)-1,3,4-thia­diazole]

In the title spiro compound, C₂₉H₂₄N₄S, the quinoxaline and thia­diazole ring systems share a common C atom; their mean planes are aligned at 87.0 (1)° in one mol­ecule and at 84.1 (1)° in the other independent mol­ecule. The thia­zole ring possesses two aromatic ring substituents and is roughly coplanar with these rings [the dihedral angles between the thia­diazole and phenyl rings are 10.7 (1) and 11.7 (1)° in one mol­ecule, and 16.8 (1) and 17.7 (1)° in the other]. The aromatic ring of the benzyl unit of one mol­ecule is disordered over two orientations in a 1:1 ratio.

Ethyl 2-(2-amino-5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7-yl)acetate

The nine-membered fused-ring of the title compound, C₁₀H₁₃N₅O₂, is approximately planar [maximum deviation = 0.012 (1) Å]; the bond angle at the methylene C atom is 111.33 (10)°. In the crystal, the amino group forms hydrogen bonds to the N atoms of the triazole rings of adjacent mol­ecules, generating a ribbon running along the a axis.

1,1''-Bis(prop-2-en-1-yl)-1,1'',2,2''-tetra­hydro­dispiro­[indole-3,7'-[6,9]diaza­tricyclo­[7.3.0.0^2,6]dodecane-8',3''-indole]-2,2''-dione

The mol­ecule of the title compound, C₃₀H₃₂N₄O₂, lies on a twofold rotation axis that passes through the mid-points of the C-C bonds of the piperazine ring, which adopts a chair conformation. The pyrrolidine ring that is fused to the piperazine ring adopts an envelope conformation (in which the N atom represents the flap). The indoline fused-ring system is nearly planar (r.m.s. deviation = 0.044 Å); the two symmetry-related indoline fused-rings systems are aligned at 71.44 (3)°.

5,5''-Dibromo-1,1''-bis­(prop-2-en-1-yl)-1,1'',2,2''-tetra­hydro­dispiro­[indole-3,7'-[6,9]diaza­tricyclo­[7.3.0.0^2,6]dodecane-8',3''-indole]-2,2''-dione

In the mol­ecule of the title compound, C₃₀H₃₀Br₂N₄O₂, the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the N atom represents the flap). The indoline fused-ring systems are nearly planar (r.m.s. deviations = 0.009 and 0.019 Å); the two fused rings are aligned at 60.63 (6)°.

1,1'-Dibenzyl-5,5''-dichloro-1,1'',2,2''-tetra­hydro­dispiro­[indole-3,7'-[6,9]diaza­tricyclo­[7.3.0.0^2,6]dodecane-8',3''-indole]-2,2''-dione

In the title compound, C₃₈H₃₄Cl₂N₄O₂, the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the C atoms connecting the two rings represent the flap). The indoline ring systems are approximately planar (r.m.s. deviations = 0.026 and 0.034 Å) and are aligned at a dihedral angle of 54.98 (3)°.