An Investigation of the Reactivity of MCPBA and α-Bromoalkenes under Traditional or Microwave-Assisted Conditions: Selective Formation of Epoxides or Allylic Bromides
作者:Giuliana Cardillo、Fides Benfatti、Luca Gentilucci、Rossana Perciaccante、Alessandra Tolomelli
DOI:10.1055/s-2005-872254
日期:——
The reaction of α-bromo-β,γ-unsaturated lactams and esters with m-chloroperbenzoic acid has been studied to find experimental conditions that could afford exclusively epoxide formation or bromide 1,3-shift. The results show a strong dependence of reactivity on the dilution and on the amount of peracid used, suggesting a radical mechanism for the bromine rearrangement. This last reaction is also strongly favored by microwave-assisted conditions.
对α-溴-β,γ-不饱和内酰胺和酯与m-氯过氧苯甲酸的反应进行了研究,以寻找能够独占环氧化物形成或溴离子1,3重排的实验条件。结果显示反应性强烈依赖于稀释度和所使用的过酸量,提示溴重排的反应机制可能为自由基机制。最后,微波辅助条件也极大地促进了这种反应。