A Convenient Synthetic Method of Isoxazole Derivatives Using Copper(II) Nitrate
摘要:
3-Acetylisoxazoles were synthesized by the reaction of alkenes or alkynes in acetone as solvent with copper(II) nitrate and formic acid. In the case of ethyl acetate as solvent, 3-benzoylisoxazoles were yielded by the reaction of alkynes and acetophenone with copper(II) nitrate and nitric acid. This synthetic method provides a convenient production of isoxazole derivatives.
gel-supported sodium hydrogen sulfate (NaHSO4/SiO2) or Amberlyst 15 as solid acid catalyst, and then the corresponding 3-acylisoxaszoles were obtained by reacting with alkynes via the 1,3-dipolar [3+2] cycloaddition. These heterogeneous catalysts are easily separable from the reaction mixture and reused. This synthetic method provides a facile, efficient, and reusable production of 3-acylisoxazoles.