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IJC-B Vol.44B(11) [November 2005] >

Title: Regioselective one-pot synthesis of 3,5-diarylpyrazoles
Authors: Lokhande, P D
Waghamare, B Y
Sakate, S S
Keywords: Diarylpyrazolines
hydrazine hydrate
Issue Date: Nov-2005
Publisher: CSIR
IPC Code Int.Cl.7 C 07 D
Abstract: The 3,5-diarylpyrazolines and pyrazoles have been easily synthesized in excellent yields by the reaction of 2'-hydroxy┬şchalcones with hydrazine hydrate. The 2'-hydroxychalcones are converted into flavanones and flavones by simple cyclisation methods and then into pyrazolines and pyrazoles, respectively. Alternatively, one-pot synthesis of pyrazoles has also been achieved by converting 2'-hydroxychalcones into pyrazolines and thereafter their dehydrogenation using I2-DMSO reagent. The regiochemistry of pyrazoles obtained via pyrazolines and from flavones has been compared.
Page(s): 2338-2342
ISSN: 0975-0983(Online); 0376-4699(Print)
Source:IJC-B Vol.44B(11) [November 2005]

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