Synthesis of 1-substituted 3,5-diaryl-2-pyrazolines by the reaction of alpha,beta-unsaturated ketones with hydrazines

摘要

1-Acetyl-, 1-propionyl- and 1-phenyl-3,5-diaryl-2-pyrazolines have been synthesized by the reaction of the appropriate alpha,beta-unsaturated ketones with hydrazine or phenylhydrazine in hot acetic acid or propionic acid. Structures of all new 2-pyrazolines 16-40 have been elucidated by microanalyses, H-1 and C-13 nmr spectroscopies.