Sequential one-pot three-step synthesis of polysubstituted 4-(5-(trifluoromethyl)-1H-pyrazol-4-yl)-1H-1,2,3-triazole systems
作者:Helio G. Bonacorso、Gean M. Dal Forno、Carson Wiethan、Alex Ketzer、Nilo Zanatta、Clarissa P. Frizzo、Marcos A. P. Martins、Mark Stradiotto
DOI:10.1039/c7ra07960e
日期:——
for the synthesis of a new series of 15 examples of polysubstituted 4-(5-(trifluoromethyl)-1H-pyrazol-4-yl)-1H-1,2,3-triazoles, in which sequential Sonogashira cross-coupling, desilylation, and a copper(I)-catalyzed azide–alkyne cycloaddition reaction (CuAAC) with an overall yield of up to 72% were used. The presence of a trifluoromethyl substituent attached to the pyrazole moiety made the Sonogashira
这项工作报告了一个成功的一锅三步操作规程,用于合成一系列新的15个多取代的4-(5-(三氟甲基)-1 H-吡唑-4-基)-1 H -1,2实例。3-三唑类化合物,其中使用顺序的Sonogashira交叉偶联,去甲硅烷基化和铜(Ⅰ)催化的叠氮化物-炔烃环加成反应(CuAAC),总收率高达72%。连接到吡唑部分的三氟甲基取代基的存在使Sonogashira交叉偶联反应具有挑战性。另外,辅助配体XPhos的选择对于所需的杂环结构是必不可少的和必不可少的。