Synthesis of (E)-α-Hydroxy-β,γ-Unsaturated Amides with High Selectivity fromα,β-Epoxyamides by Using Catalytic Samarium Diiodide or Triiodide
作者:José M. Concellón、Pablo L. Bernad、Eva Bardales
DOI:10.1002/chem.200305375
日期:2004.5.17
stereoselective synthesis of (E)-alpha-hydroxy-beta,gamma-unsaturated amides starting from alpha,beta-epoxyamides, by using catalytic SmI2 or SmI3, was achieved. This transformation can also be carried out by using SmI2 generated in situ from samarium powder and diiodomethane. The starting compounds 1 are easily prepared by the reaction of enolates derived from alpha-chloroamides with ketones at -78 degrees
通过使用催化SmI2或SmI3,实现了从α,β-环氧酰胺开始的(E)-α-羟基-β,γ-不饱和酰胺的高度立体选择性合成。也可以使用由from粉和二碘甲烷原位生成的SmI2进行转化。起始化合物1可以容易地通过在α-78℃下将衍生自α-氯酰胺的烯醇化物与酮反应来制备。已经提出了解释这种转变的机理。已进行(E)-α-羟基-β,γ-不饱和酰胺的环丙烷化反应以证明其合成应用。