Microwave-promoted Aromatization of 1,3,5-trisubstituted 4,5-Dihydro-1H-pyrazoles by Calcium Hypochlorite under Solvent-free Conditions
摘要:
An efficient microwave-promoted aromatization of 1,3,5-trisubstituted 4,5-dihydro-1H-pyrazoles using calcium hypochlorite [Ca(OCl)(2)] has been reported. The reaction proceeds very fast to give pyrazoles in good yields on irradiation of a mixture of the dihydropyrazole and Ca(OCl)(2) on alumina without using solvent.