Crystal structure of 3-methoxycarbonyl-2-(4-methoxyphenyl)-8-oxo-1-azaspiro[4.5]deca-1,6,9-trien-1-ium-1-olate

Abstract

The title compound, C 18 H 17 NO 5 , was prepared by a synthetic strategy based on the Heck reaction from Morita-BaylisHillman adducts. The five-membered ring adopts a slightly twisted conformation on the C a -C m (a = aromatic and m = methylene) bond. The dihedral angle between the fivemembered ring and the spiro aromatic ring is 89.35 (7) ; that between the five-membered ring and the 4-methoxybenzene ring is 4.65 (7). Two short intramolecular C-HÁ Á ÁO contacts occur. In the crystal, molecules are linked by C-HÁ Á ÁO hydrogen bonds to generate a three-dimensional network.Keywords: single-crystal X-ray study; spirohexadienone structure; MoritaBaylis-Hillman aducts.CCDC reference: 1030399 Related literature Data collectionBruker APEXII CCD diffractometer Absorption correction: multi-scan (SADABS;Bruker, 2010)