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Microwave-Assisted Synthesis of Some 3,5-Arylated 2-Pyrazolines

Author(s): Davood Azarifar | Hassan Ghasemnejad

Journal: Molecules ISSN 1420-3049
Volume: 8; Issue: 8; Start page: 642; Date: 2003;
Original page

Keywords: Microwave irradiation | chalcones | 3 | 5-arylated-2-pyrazolines | pyrazolines | heterocyclic synthesis

ABSTRACT
Condensation of 2-acetylnaphthalene with benzaldehydes under microwave irradiation affords chalcones which undergo facile and clean cyclizations with hydrazines RNHNH2 (R= H, Ph, Ac) to afford 3,5-arylated 2-pyrazolines in quantitative yields, also under microwave irradiation and in the presence of dry AcOH as cyclizing agent. The results obtained indicate that, unlike classical heating, microwave irradiation results in higher yields, shorter reaction times (2-12 min.) and cleaner reactions.