Crystal structure of 11-(2,3-dimethoxyphenyl)-14-methyl-12-oxa-8,14-diazatetracyclo[8.3.3.01,10.02,7]hexadeca-2(7),3,5-triene-9,13-dione

Abstract

The title compound, C22H22N2O5, contains two conformationally similar molecules (A and B) in its the asymmetric unit (r.m.s. overlay fit for the 29 non-H atoms = 0.194 Å). In each molecule, the lactone ring has an envelope conformation with the spiro C atom as the flap. In the crystal, A+A and B+B inversion dimers linked by pairs of N—H...O hydrgen bonds occur; in both cases, R22(8) loops are generated. A weak C—H...O interaction is also observed, which links the dimers into [010] chains.

Keywords

• crystal structure
• diazatetracyclhexadecatrienedione
• N—H...O hydrgen bonds