Process for the synthesis of 4-substituted N-[(alk-2-en-1-yl)oxy]-and N-aralkyloxy-2,2,6,6-tetraalkylpiperidines
申请人:Ciba Specialty Chemicals Corporation
公开号:US06211378B1
公开(公告)日:2001-04-03
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。