Crystal structure and Hirshfeld surface analysis of ethyl 6'-amino-2'-(chloro-meth-yl)-5'-cyano-2-oxo-1,2-di-hydro-spiro-[indoline-3,4'-pyran]-3'-carboxyl-ate

Crystal structure and Hirshfeld surface analysis of ethyl 2′-amino-5-bromo-3′-cyano-6′-methyl-2-oxospiro[indoline-3,4′-pyran]-5′-carboxylate

In the title structure, the 2,3-di­hydro-1H-indole ring system is nearly planar, while the conformation of the 4H-pyran ring is close to a flattened boat. The mean planes of these fragments are approximately perpendicular to each other. In the crystal, the mol­ecules are connected into layers by N—H⋯N and N—H⋯O hydrogen bonds.

The crystal used for structure determination contained, along with the title compound, C₁₇H₁₄BrN₃O₄, an admixture [0.0324 (11)] of its 7-bromo isomer. The 2,3-di­hydro-1H-indole ring system is nearly planar, while the conformation of the 4H-pyran ring is close to a flattened boat. The mean planes of these fragments form a dihedral angle of 86.67 (9)°. The carboxyl­ate group lies near the plane of 4H-pyran, its orientation is stabilized by an intra­molecular C—H⋯O contact. In the crystal, the mol­ecules are connected into layers by N—H⋯N and N—H⋯O hydrogen bonds. The most important contributions to the crystal packing are from H⋯H (33.1%), O⋯H/H⋯O (16.3%), N⋯H/H⋯N (12.1%), Br⋯H/H⋯Br (11.5%) and C⋯H/H⋯C (10.6%) inter­actions.