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 regiospecific synthesis 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
从4-烷氧基-1,1,1-三氟-3-链烯-2-酮的环缩合反应中,一系列十二种5-三氟甲基-4,5-二氢吡唑和-吡唑的区域专一性合成[F 3 CC(O )CH = C(R 1)OR,其中R 1= Me,Et,Pr,iso -Pr,Bu,iso-Bu,Ph,H;报道了通过环境友好的微波诱导技术在甲苯中的苯肼与R = Me,Et]。结果表明,在适当的条件下,微波辐射功率的变化会导致4,5-二氢吡唑或吡唑衍生物。本文还包括使用蒙脱石K-10作为无溶剂条件下合成吡唑的固体载体。