Lactones; XIII. Grignard Reaction Followed by Phase-Transfer Oxidation: A Convenient Synthesis of γ,γ-Disubstituted γ-Butyrolactones from γ-Butyrolactone Grignard Reaction of γ-butyrolactones, followed by oxidation of the resulting reaction mixture produces symmetrically γ,γ-dialkylared diarylated γ-butyrolactones. Phase transfer oxidation with potassium permanganate in benzene/water proves to be the best out of twelve examined oxidation methods. The synthesis is unsuccessful with sterically hindered or oxidizable Grignard reagents.
内酯 XIII;Grignard反应后进行相转移氧化:从
γ-丁内酯通过Grignard反应便捷地合成γ,γ-二取代
γ-丁内酯。
γ-丁内酯的Grignard反应后,对生成的反应混合物进行氧化,可得到对称的经二烷基化的二芳基化
γ-丁内酯。在苯/
水体系中使用
高锰酸钾进行相转移氧化,在考察的十二种氧化方法中效果最佳。使用空间位阻大的或易氧化的Grignard试剂进行合成是不可行的。