Ethyl 10α-hydroxy-4,9-dimethyl-14-oxo-3,8,15-trioxatetracyclo[10.3.0.02,4.07,9]pentadecane-13-spiro-5′-pyrazole-3′-carboxylate

Abstract

The ten-membered ring in the title molecule, C25H29ClN2O7, adopts an approximate chair–chair conformation, whereas the five-membered furan and pyrazole rings display envelope conformations. The mean plane of the furan ring is almost perpendicular to that of the pyrazole ring, as indicated by the dihedral angle between them of 86.45 (9)°. The pyrazole ring is slightly inclined to the plane of the attached phenyl ring, subtending a dihedral angle of 16.88 (8)°. The conformation of the molecule is stabilized by six intramolecular hydrogen bonds and crystal cohesion is ensured by five C—H...O hydrogen bonds, in addition to C—H...π interactions.

Keywords

• crystal structure
• hydrogen bonding
• furan
• pyrazole