One Step Preparation of 1,4-Diketones from Methyl Ketones and α-Bromomethyl Ketones in the Presence of ZnCl2 · t-BuOH · Et2NR as a Condensation Agent
作者:Natali M. Nevar、Alexander V. Kel'in †、Oleg G. Kulinkovich
DOI:10.1055/s-2000-6418
日期:——
1,4-Diketones have been prepared in one step from methyl ketones and α-bromomethyl ketones under the action of ZnCl2 · t-BuOH · Et2NR as a condensation agent with moderate to high yields. The mechanistic pathway of the reaction is proposed to go through aldol condensation of ketones followed by 1,3-dehydrobromination of aldol products and cleavage of activated cyclopropyl intermediates.
在 ZnCl2 - t-BuOH - Et2NR 作为缩合剂的作用下,以甲基酮和δ-溴甲基酮为原料一步制备出了 1,4-二酮,收率从中等到较高。该反应的机理途径是通过酮的醛醇缩合,然后是醛醇产物的 1,3-脱溴反应和活化环丙基中间体的裂解反应。