A new method has been found for generation of nitrile oxides in situ from nitroalkanes under mild conditions. Thus, reaction of nitroalkanes 1 with di-tert-butyl dicarbonate (2) and 4-dimethyl-aminopyridine (3) as catalyst in the presence of dipolarophiles at room temperature afforded cycloadducts (e.g. 5,6, and 7) in improved yields compared to known methods. Solvent effects were also noted.
已发现一种新方法,可以在温和条件下从硝基
烷烃原位生成腈氧化物。因此,将硝基
烷烃1与二叔丁基二
羧酸酯(2)和含有催化剂的4-二甲基
氨基吡啶(3)在室温下与极性偶极体反应,得到了环加成产物(例如5、6和7),其产率相比已知方法有了改善。同时也观察到了溶剂效应。