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Regioselective Synthesis of Silylated Pyrazolines and Indazolines by Reaction of Pyrazolium and Indazolium Salts with Silyllithium Reagents

✍ Scribed by Ana M. González-Nogal; Mariola Calle; Luis A. Calvo; Purificación Cuadrado; Alfonso González-Ortega

Book ID
102173820
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
130 KB
Volume
2005
Category
Article
ISSN
1434-193X

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## Abshnct 1,3,5-trisubstituted-2-methylpyrazolium iodides react with dimethylphenylsilyl-and twtbutyldiphenylsilyllithium leading, in general, to one of the corresponding S-silyl-3-pyrazolines The silyl group is easily substituted by electrophiles to give 5-tinctionalized 3-pyrazolines.Moreover.

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2-Pyrazolin-4-oximes have been synthesized by reaction of 4-nitroso-and 4nitropyrazoles with complex metal hydrides and organometallic reagents. Furthermore, 4nitropyrazolium tetrafluoroborates are reactive substrates towards organolithium and Grignard compounds leading to new and highly substituted