Rearrangement of Epoxynitriles: A Convenient Homologation of Acyclic and Cyclic Ketones to Carboxylic Acids
作者:Neil F. Badham、Wilford L. Mendelson、Andrew Allen、Ann M. Diederich、Drake S. Eggleston、John J. Filan、Alan J. Freyer、Lewis B. Killmer,、Conrad J. Kowalski、Li Liu、Vance J. Novack、Frederick G. Vogt、Kevin S. Webb、Jennifer Yang
DOI:10.1021/jo025737g
日期:2002.7.1
A convenient two-step homologation of both aliphatic and aromatic ketones to the corresponding carboxylic acid has been developed. First ketones were converted to epoxynitriles with the Darzens reaction. Second, a Lewis acid mediated rearrangement of these epoxynitriles with lithium bromide was achieved to give homologated secondary alkanoic acids (as well as aryl-alkanoic) in good yields. The mechanism
已经开发了脂族和芳族酮到相应的羧酸的方便的两步同系物。通过Darzens反应将第一酮转化为环氧腈。第二,实现了路易斯酸与溴化锂介导的这些环氧腈的重排,从而以良好的收率得到了同系的仲链烷酸(以及芳基-链烷酸)。研究了重排反应的机理和范围。该策略构成了酮与仲羧酸的两步同源化。