furfural using the Ruppert–Prakash reagent (TMSCF3) and subsequent photo-Achmatowicz reaction afforded 6-hydroxy-2-(trifluoromethyl)-2H-pyran-3(6H)-one. After acetylation, the resultant 6-acetoxy-2-(trifluoromethyl)-2H-pyran-3(6H)-one was transformed into various 1-(trifluoromethyl)-8-oxabicyclo[3.2.1]oct-3-en-2-one derivatives through a base-mediated oxidopyrylium [5 + 2] cycloaddition. The reactivity and
使用 Ruppert-Prakash 试剂 (TMSCF 3 ) 对
糠醛进行三
氟甲基化,随后进行光 Achmatowicz 反应,得到 6-羟基-2-(三
氟甲基)-2 H-
吡喃-3(6 H )-酮。乙酰化后,生成的 6-acetoxy-2-(trifluoromethyl)-2 H -pyran-3(6 H )-one 转化为各种 1-(trifluoromethyl)-8-oxabicyclo[3.2.1]oct-3-en -2-one 衍
生物通过碱介导的 oxidopyrylium [5 + 2] 环加成。使用密度泛函理论计算分析了 2-三
氟甲基化氧化
吡喃物种对 [5 + 2] 环加成的反应性和选择性。