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ChemInform Abstract: Synthesis of New Chiral N-Substituted Fused Pyrazoles and Pyrazolinols.

✍ Scribed by S. A. POPOV; M. M. SHAKIROV; A. V. TKACHEV; N. DE KIMPE

Publisher
John Wiley and Sons
Year
2010
Weight
39 KB
Volume
29
Category
Article
ISSN
0931-7597

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## Abstract Reaction of spirocyclopropanepyrazole derivative (I) with α‐chloro esters (III) in the presence of a NaI/K~2~CO~3~ system results in cyclopropane ring opening and subsequent C‐ or N‐substitution to furnish dihydropyridazines (IV) and N‐substituted dihydropyrazoles (V).