An improved methodology for Wittig condensation of trifluoromethyl ketones with non-stabilized phosphorus ylides, which takes place under smooth and homogeneous reaction conditions, is reported. By this procedure trifluoromethyl alkenes 3a-c are obtained in almost quantitative yields and with a high stereochemical control. The use of 3b and 3c as building blocks for the preparation of the corresponding trifluoro esters 7a and 7b, which are potential insect growth regulators, is also described.
报道了一种改进的三
氟甲基酮与不稳定的
磷叶立德的 Wittig 缩合方法,该方法在平稳且均匀的反应条件下进行。通过该程序,以几乎定量的收率和高立体
化学控制获得三
氟甲基烯烃3a-c。还描述了使用3b和3c作为结构单元来制备相应的三
氟酯7a和7b,它们是潜在的昆虫生长调节剂。