Organic Letters p. 2377 - 2379 (2008)
Update date:2022-08-04
Topics:
Alex, Karolin
Tillack, Annegret
Schwarz, Nicolle
Beller, Matthias
(Chemical Equation Presented) A novel regioselective synthesis of aryl-substituted pyrazolines and pyrazoles has been developed. Substituted phenylhydrazines react with 3-butynol in the presence of a catalytic amount of zinc triflate to give pyrazoline derivatives. The resulting products are easily oxidized in a one-pot procedure to the corresponding pyrazoles.
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