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Synthesis of Spiro-Fused (C5)-Isoxazolino-(C4)-pyrazolones (1-Oxa-2,7,8-triazaspiro[4,4]-2,8-dien-6-ones) via 1,3-Dipolar Cycloaddition and Cycloelimination

✍ Scribed by Sammelson, Robert E.; Gurusinghe, Chamindra D.; Kurth, Jeffrey M.; Olmstead, Marilyn M.; Kurth, Mark J.


Book ID
121407968
Publisher
American Chemical Society
Year
2002
Tongue
English
Weight
159 KB
Volume
67
Category
Article
ISSN
0022-3263

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## Abstract Regioselective 1,3‐dipolar cycloaddition of nitrilimines (generated in situ from dehydrohalogenation of the corresponding hydrazonoyl halides by the action of triethylamine) with 4‐arylidene‐1‐aryl‐2‐phenyl‐1__H__‐imidazol‐5(4__H__)‐one **3** afforded the corresponding spiro[4,4]nona‐2,