G. Gelli, Enzo Cadoni, M. Pani
Aug 15, 1994
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Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The crystal structure of ethyl 5-(2,6-dimethylphenyl)-2-methyl-3-oxa-4,8,9-triazatricyclo[5.3.0.0 2,6 ]deca-4,9-diene-8-carboxylate, C 18 H 21 N 3 O 3 (III), has been determined. The reaction between 2,6-dimethylbenzonitrile oxide (1) and ethyl 5-methyl-1,2-diazepine-1-carboxylate (II) gives rise to an anti tricyclo derivative with a rigid skeleton formed by 2-pyrazoline, cyclobutane and 2-isoxazoline planar rings. With respect to the central cyclobutane system, the bond lengths of which range from 1.539 (5) to 1.558 (5) A and the bond angles of which range from 89.7 (2) to 90.7 (2) o , the 2-pyrazoline and the 2-isoxazoline planes form dihedral angles of 116 and 112 o , respectively. The methyl group at the end of the ethyl carboxylate chain is disordered