A Novel and Convenient Synthesis of Cyclopent-1-enecarboxylates by an Intramolecular Horner-Wadsworth-Emmons Reaction
作者:Henryk Krawczyk、Łukasz Albrecht
DOI:10.1055/s-0028-1083242
日期:2008.12
A general and efficient method for the preparation of 2-diethoxyphosphoryl-6-oxohexanoates is presented. This approach is based on the Michael addition of [2-(1,3-dioxolan-2-yl)ethyl]magnesium bromide to various 3-substituted tert-butyl (E)-2-(diethoxyphosphoryl)alk-2-enoates as a key step. Application of the 2-diethoxyphosphoryl-6-oxohexanoates obtained in the intramolecular Horner-Wadsworth-Emmons reaction for the preparation of 5-substituted tert-butyl cyclopent-1-enecarboxylates is also reported.
Spontaneous Nef reaction of 3-aryl-2-(diethoxyphosphoryl)-4-nitroalkanoic acids
作者:Henryk Krawczyk、Łukasz Albrecht、Jakub Wojciechowski、Wojciech M. Wolf
DOI:10.1016/j.tet.2006.07.041
日期:2006.9
Spontaneous Nefreaction of primary and secondary 3-aryl-2-(diethoxyphosphoryl)-4-nitroalkanoic acids has been observed for the first time. The reaction provides a general and effective, highly diastereoselective synthesis of 3-(diethoxyphosphoryl)-1-hydroxysuccinimides and 2-(diethoxyphosphoryl)-4-oxoalkanoic acids.