Ethyl 9-amino-7-(4-methoxyphenyl)-7H-pyrano[3,2-c]coumarin-8-carboxylate
✍ Scribed by Wang, Jing ;Shi, Daqing ;Wang, Xiangshan
- Publisher
- International Union of Crystallography
- Year
- 2004
- Tongue
- English
- Weight
- 143 KB
- Volume
- 60
- Category
- Article
- ISSN
- 1600-5368
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✦ Synopsis
The title compound, C 22 H 19 NO 6 , was synthesized by the reaction of 4-hydroxycoumarin and ethyl 4 H -methoxy-2-cyanocinnamate in the presence of triethylbenzylammonium chloride in an aqueous medium. In the crystal structure, the amino group is involved in both intra-and intermolecular NÐ HÁ Á ÁO hydrogen bonds.
📜 SIMILAR VOLUMES
Single-crystal X-ray study T = 193 K Mean '(C±C) = 0.002 A Ê R factor = 0.038 wR factor = 0.102 Data-to-parameter ratio = 12.7 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.
Single-crystal X-ray study T = 296 K Mean '(C±C) = 0.003 A Ê Disorder in main residue R factor = 0.040 wR factor = 0.101 Data-to-parameter ratio = 12.8 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.
In the structure of the title compound, C 12 H 17 NO 2 S, the terminal ester group lies in the plane of the thiophene ring system. The cycloheptene ring adopts a half-chair conformation. There are intramolecular N-HÁ Á ÁO and C-HÁ Á ÁO interactions, and intermolecular N-HÁ Á ÁO and C-HÁ Á Á interact
## Abstract A Hofmann—Martius rearrangement mechanism is suggested for the reaction of known azomethines (I) with cyclohexane‐1,3‐dione.