Unusual reductive cleavage of 3-aryl-2,3-epoxyamides by using samarium diiodide. Synthesis of 3-aryl-3-deuterio-2-hydroxyamides with total regioselectivity
作者:José M. Concellón、Eva Bardales、Cecilia Gómez
DOI:10.1016/s0040-4039(03)01201-2
日期:2003.7.7
Ring-opening of 3-aryl-2,3-epoxyamides 1 was achieved by using samarium diiodide and D2O, yielding 3-aryl-3-deuterio-2-hydroxyamides 2 with total regioselectivity. The starting compounds 1 were easily prepared by reaction of the corresponding lithium or potassium enolates of α-chloroamides with aldehydes or ketones. When the reaction was carried out in the presence of H2O instead of D2O, the corresponding
通过使用二碘化and和D 2 O实现3-芳基-2,3-环氧酰胺1的开环,得到具有总区域选择性的3-芳基-3-氘代-2-羟基酰胺2。通过使相应的α-氯酰胺的烯醇锂或钾的烯醇盐与醛或酮反应,可以容易地制备起始化合物1。当反应在H 2 O而不是D 2 O存在下进行时,分离出相应的3-芳基-2-羟基酰胺。对映体纯的3-芳基-2,3-环氧酰胺的处理提供了光学活性的3-芳基-2-羟基酰胺。