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ChemInform Abstract: Ring Transformation of Spirocyclopropanepyrazoles into Pyrano[2,3-c]pyrazoles.

โœ Scribed by Hiroshi Maruoka; Eiichi Masumoto; Takafumi Eishima; Fumi Okabe; Sho Nishida; Yuki Yoshimura; Toshihiro Fujioka; Kenji Yamagata

Publisher
John Wiley and Sons
Year
2009
Weight
31 KB
Volume
40
Category
Article
ISSN
0931-7597

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Ring Transformation of 3-Halo-4-methoxycoumarins into Pyrazoles with Hydrazines. -Treatment of (I) with hydrazine at room temperature affords the pyrazoles (II). In the reaction of (I) with excess hydrazine and phenylhydrazine unexpected pyrazolinones (III) and (V), respectively, are obtained.