synthetic utility of this reagent is demonstrated by a direct regioselective [3 + 2] cycloaddition with electron-deficient alkynes and alkenes. This protocol enables facile construction of an array of difluoromethyl-substituted pyrazoles in good to high yields under mild reaction conditions.
已开发出苯砜二
氟重氮乙烷 (PhSO 2 CF 2 CHN 2 ),这是一种易于制备且工作稳定的掩蔽 CF 2结构单元。该试剂的合成效用通过与缺电子
炔烃和烯烃的直接区域选择性 [3 + 2] 环加成反应得到证明。该协议能够在温和的反应条件下轻松构建一系列二
氟甲基取代的
吡唑,产率从良好到高产。