作者:Biqiong Hong、Xinzhi Ding、Mengfan Jiang、Lu Qin、Zitong Lin、Wei Wu、Zhiqiang Weng
DOI:10.1016/j.tetlet.2022.154018
日期:2022.8
and general method for the synthesis of 3-trifluoromethyl-4‑trifluoroacetyl pyrazoles from the cycloaddition of sydnones with 1,1,1,5,5,5-hexafluoropentane-2,4-dione has been established. Using ZnI2/bpy as a catalyst in THF, this protocol proved to be general to prepare a variety of 3-trifluoromethyl-4‑trifluoroacetyl pyrazoles in good yields. Utility of this method was demonstrated by further transformations
建立了一种有效且通用的方法,用于通过 1,1,1,5,5,5-六氟戊烷-2,4-二酮环加成合成 3-三氟甲基-4-三氟乙酰基吡唑。使用 ZnI 2 /bpy 作为 THF 中的催化剂,该方案被证明可以以良好的收率制备各种 3-三氟甲基-4-三氟乙酰基吡唑。该方法的实用性通过三氟乙酰基的进一步转化证明了该方法的实用性,提供了方便地获得基于 3-三氟甲基吡唑的羧酸和醇衍生物的途径。