A simple and efficient methodology has been developed for the one-pot preparation of α-methylene-γ-butyrolactones by free-radical induced Barbier-type reaction of methyl 2-(bromomethyl)acrylate and aldehydes followed by in situ lactonization. The radical initiator titanocene(III) chloride (Cp2TiCl) was easily generated in situ from commercially available Cp2TiCl2 and activated zinc dust in THF. Ketones
已经开发了一种简单有效的方法,用于通过自由基诱导的2-(
溴甲基)
丙烯酸甲酯和醛的Barbier型反应,然后就地内酯化,一锅制备α-亚甲基-
γ-丁内酯。自由基
引发剂氯化
钛茂(III)(Cp 2 TiCl)易于从商购的Cp 2 TiCl 2和THF中的活化
锌粉中原位生成。酮在反应条件下保持不受影响。