Microwave assisted regiospecific synthesis of 5-trifluoromethyl-4,5-dihydropyrazoles and-pyrazoles
作者:Marcos A. P. Martins、Claudio M. P. Pereira、Sidnei Moura、Clarissa P. Frizzo、Paulo Beck、Nilo Zanatta、Helio G. Bonacorso、Alex F. C. Flores
DOI:10.1002/jhet.5570440537
日期:2007.9
The regiospecificsynthesis of a series of twelve 5-trifluoromethyl-4,5-dihydropyrazoles and -pyrazoles from the cyclocondesation reaction of 4-alkoxy-1,1,1-trifluoro-3-alken-2-ones [F3CC(O)CH=C(R1)OR, where R1 = Me, Et, Pr, iso-Pr, Bu, iso-Bu, Ph, H; and R = Me, Et] with phenylhydrazine in toluene by environmentally benign microwave induced techniques is reported. It is shown that under appropriated