Process for preparing 4-substituted 2,2,6,6-tetramethylpiperidin-N-oxy and 2,2,6,6-tetramethylpiperidin-N-hydroxy compounds
    1.
    发明申请
    Process for preparing 4-substituted 2,2,6,6-tetramethylpiperidin-N-oxy and 2,2,6,6-tetramethylpiperidin-N-hydroxy compounds 审中-公开
    制备4-取代的2,2,6,6-四甲基哌啶-N-氧基和2,2,6,6-四甲基哌啶-N-羟基化合物的方法

    公开(公告)号:US20050256312A1

    公开(公告)日:2005-11-17

    申请号:US11125149

    申请日:2005-05-10

    CPC分类号: C07D211/94

    摘要: A process for preparing 4-substituted 2,2,6,6-tetramethylpiperidin-N-oxy compounds (II) or mixtures of (II) and 4-substituted 2,2,6,6-tetramethylpiperidin-N-hydroxy compounds (III) where X+Y can be O or can represent a cyclic ketal with the radicals or can represent an open-chain ketal in which X═O—R and Y═O—R′, where R and R′ can be identical or different and can each be CH3, CH2—CH3, CH2—CH2—CH3, CH(CH3)—CH3, CH2—CH2—CH2—CH3 and CH2—CH(CH3)—CH3, by oxidizing corresponding 4-substituted 2,2,6,6-tetramethylpiperidines (I) with hydrogen peroxide in the presence of alkali metal hydrogencarbonate and/or ammonium hydrogencarbonate and in the presence or absence of a solvent, in which the reaction is carried out with the addition of Brönsted acids which have an acid strength greater than that of the hydrogencarbonate.

    摘要翻译: 制备4-取代的2,2,6,6-四甲基哌啶-N-氧化合物(II)或(II)和4-取代的2,2,6,6-四甲基哌啶-N-羟基化合物(III)的混合物的方法 )其中X + Y可以是O或可以表示具有自由基的环状缩酮,或者可以表示开链缩酮,其中XOR和YO-R',其中R和R'可以相同或不同, CH 2,CH 2,CH 3,CH 2,-CH 2,-CH 2, CH 3(CH 3 CH 3) - CH 3,CH 2 -CH 2, -CH 2 CH 3和CH 2 -CH(CH 3 CH 3) - CH 3, 通过在碱金属碳酸氢盐和/或碳酸氢铵存在下,在过氧化氢存在下,在有或无溶剂下,用相应的4-取代的2,2,6,6-四甲基哌啶(I)氧化相应的4-取代的2,2,6,6-四甲基哌啶(I) 加入酸强度大于碳酸氢钠的布朗斯台德酸进行反应。