General method for dehydration, intramolecular cyclization, and fluorination of trifluoromethyl-1H-pyrazoles using DAST
作者:Helio G. Bonacorso、Liliane M.F. Porte、Gisele R. Paim、Fabio M. Luz、Marcos A.P. Martins、Nilo Zanatta
DOI:10.1016/j.tetlet.2010.05.052
日期:2010.7
fluorinating agent, was applied in the dehydration, intramolecular cyclization, and mono- and difluorination reactions of some 5-trifluoromethyl-1H-pyrazoles and 2-pyrazolines employing a general, mild, and efficient methodology. The azole precursors were synthesized from the reactions of acyclic and cyclic trifluoroacetylated enol ethers with hydrazines [NH2NHR, where R = C6H5, C6F5, 2-Furanoyl] and showed a
在这项研究中,通用的三氟二乙氨基硫三氟化物(DAST)被用于某些5-三氟甲基-1 H-吡唑和2-吡唑啉的脱水,分子内环化以及单和二氟化和二氟化反应。一般,温和,有效的方法。唑类前体从的反应合成无环和环状三氟乙酰化的烯醇醚与肼[NH 2 NHR,其中R = C 6 H ^ 5,C 6 ˚F 5,2- Furanoyl],并显示在DAST的存在下分化的化学行为。