A regioselective, solvent-free and catalyst-free synthesis of isoxazoles has been successfully developed under ball milling conditions. Milling the mixtures of N-hydroxybenzimidoyl chlorides and enamino carbonyl compounds in a ball mill at a frequency of 14.6 Hz for 20–60 min afforded isoxazoles in up to 86% yields. A possible reaction mechanism leading to the formation of the observed isoxazoles is
在球磨条件下,已成功开发了区域选择性,无溶剂和无催化剂的
异恶唑合成方法。在球磨机中以14.6 Hz的频率将N-羟基
苯甲酰氯和烯
氨基羰基化合物的混合物研磨20-60分钟,得到的
异恶唑的收率高达86%。提出了导致观察到的
异恶唑形成的可能的反应机理。