Ethyl 2-amino-7,7-dimethyl-2',5-dioxo-spiro-[5,6,7,8-tetra-hydro-4H-chromene-4,3'(2'H)-1H-indole]-3-carboxyl-ate.

Research paper by Jing J Wang, Song-Lei SL Zhu

Indexed on: 01 Jan '10Published on: 01 Jan '10Published in: Acta Crystallographica Section E


In the mol-ecule of the title compound, C(21)H(22)N(2)O(5), the indole system and the spiro-pyran ring are almost planar [maximum deviations of 0.0447 (17) and 0.0781 (17) Å, respectively]; the dihedral angle between them is 84.6 (3)°. The remaining six-membered ring adopts a twisted conformation. Intra-molecular N-H⋯O hydrogen bonds occur. In the crystal structure, intera-molecular N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules.