A strategy for the annulation reaction of alkynones with ethyl 4,4,4-trifluoro-3-oxobutanoate through C–C bond cleavage is described. The zirconium-catalyzed transformation provides access to a wide range of structurally diverse 6-(trifluoromethyl)-2H-pyran-2-ones in moderate to good yields, utilizing Na2CO3 as a base. Further transformations into trifluoromethylated arene derivatives have been demonstrated
描述了炔酮与
4,4,4-三氟-3-氧代丁酸乙酯通过 C-C 键断裂进行环化反应的策略。利用Na 2 CO 3作为碱,
锆催化转化可以以中等至良好的收率获得各种结构多样的6-(三
氟甲基)-2 H-
吡喃-2-酮。进一步转化为三
氟甲基化
芳烃衍
生物也已得到证实。此外,通过进行各种对照实验并分离含有分子内氢键的
β-二酮中间体(X射线),提出了合理的反应途径。