Nitrile oxides were formed from α-nitro ketones using silica 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.

中文翻译：

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用可重复使用的固体酸催化剂合成 3-酰基异恶唑衍生物的简便方法

以硅胶负载的硫酸氢钠（NaHSO4/SiO2）或Amberlyst 15为固体酸催化剂，由α-硝基酮生成腈氧化物，然后通过1,3-偶极与炔烃反应得到相应的3-酰基异恶唑。 [3+2] 环加成。这些多相催化剂很容易从反应混合物中分离出来并重复使用。这种合成方法提供了一种简便、高效且可重复使用的 3-酰基异恶唑生产方法。