Lithiation and Reactions of Stilbene Oxides: Synthetic Utility
摘要:
The lithiation of trans- and cis-stilbene oxides (+/-)-1 and 8 has been investigated. While with 8, lithiation occurred exclusively at the benzylic position, with the trans isomer (+/-)-1, ortho-lithiation competed with alpha-lithiation depending upon the experimental conditions. The configurational stability of the alpha-lithiated cis- and trans-stilbene oxides (+/-)-2 and (+/-)-9, respectively, was proved as well as that of scalemic stilbene oxide (R,R)-2.
Epoxide Formation by Indirect Electroreductive Coupling between Aldehydes or Ketones and Activated<i>gem</i>-Dichloro Compounds
作者:J. P. Paugam、S. Oudeyer、E. Léonel、J.-Y. Nédélec
DOI:10.1055/s-2004-815915
日期:——
Epoxides are prepared by indirect electroreductive coupling of carbonyl compounds (aldehydes or ketones) and activated gem-dichloro compounds. This process is more efficient with aryl ketones than with aryl aldehydes. Though yields are only moderate, this method offers the valuable advantage of avoiding the use of strong bases or peroxides.