A Versatile Iron-Catalyzed Protocol for the One-Pot Synthesis of Isoxazoles or Isoxazolines from the Same Propargylic Alcohols
作者:Olivier Debleds、Eric Gayon、Emilie Ostaszuk、Emmanuel Vrancken、Jean-Marc Campagne
DOI:10.1002/chem.201001461
日期:2010.10.25
The use N‐sulfonyl‐protected hydroxylamines as bi‐nucleophiles in iron‐catalyzed propargylic substitutions allows the selective one‐pot synthesis of four classes of substituted isoxazoles or isoxazolines from the same propargylic alcohols (21 examples) by simply tuning the nature of the base. By using an iron(III) catalyst and a base such as triethylamine (3 equiv), isoxazoles 3 are obtained in good
在铁催化的炔丙基取代中使用N磺酰基保护的羟胺作为双亲核试剂,可通过简单地调节碱的性质,从同一炔丙醇中选择性地一锅合成四类取代的异恶唑或异恶唑啉(21个实例) 。通过使用铁(III)催化剂和碱(如三乙胺(3当量)),可以以良好的分离产率(56–95%)获得异恶唑3,而有选择地获得N-磺酰基保护的异恶唑啉6(77-93%)。通过在催化量的吡啶(10mol%)存在下使用铁和金催化剂来制备。