Highly stereoselective intramolecular cycloadditions of unsaturated N-substituted oximes, nitrones, and azomethine ylides on the surface of silica gel without a solvent, which have been conducted under microwave irradiation, to produce functionalized tricyclic isoxazolidines fused with a pyrroline or piperidine ring in good yields, are presented.
在
硅胶表面,在不使用溶剂的情况下,在微波辐射下,对不饱和N-取代
肟、硝酮和
氮丙啶亚基进行高度立体选择性分子内环加成,从而以高收率生产出与
吡咯啉或
哌啶环融合的官能化
三环异噁唑烷。