An environmentally friendly process for the preparation of the 4-functionalized N—OR derivatives of 2,2,6,6-tetraalkylpiperidines involves the hydrogen peroxide of the corresponding N—H compound to form the corresponding N-oxyl derivative, reacting two equivalents of the N-oxyl compound with one equivalent of a compound having an allylic hydrogen, a benzylic hydrogen or an activated methine hydrogen to form one equivalent of the corresponding N—OH compound and one equivalent of the corresponding N—OR compound, and recycling the N—OH compound back to the corresponding N-oxyl compound using hydrogen peroxide or air.
一种环保的方法用于制备2,2,6,6-四烷基
哌啶的4-取代N—OR衍
生物,该方法涉及使用
过氧化氢将相应的N—H化合物转化为相应的N-氧化物衍
生物,然后将两当量的N-氧化物化合物与一个具有烯丙基氢,苄基氢或活化
甲烷氢的化合物的一个当量反应,形成一个相应的N—OH化合物和一个相应的N—OR化合物,最后使用
过氧化氢或空气将N—OH化合物回收至相应的N-氧化物化合物。