Process for purifying sterically hindered 4-amino piperidines
    52.
    发明授权
    Process for purifying sterically hindered 4-amino piperidines 失效
    空间位阻4-氨基哌啶纯化方法

    公开(公告)号:US6011157A

    公开(公告)日:2000-01-04

    申请号:US180626

    申请日:1998-11-12

    CPC分类号: C07D211/56

    摘要: A process for purifying crude piperidines of the formula I ##STR1## where R.sup.1 to R.sup.4 are C.sub.1 -C.sub.6 -alkyl, or R.sup.1 and R.sup.2 and/or R.sup.3 and R.sup.4 together are a CH.sub.2 -chain of 2 to 5 carbons, which comprises, in a first step, removing high-boiling substances and, if present, water from the crude piperidines by distillation; in a second step, adding from 0.01 to 5% by weight, based on the product of the first step, as a reducing agent; and, in a third step, isolating the piperidines by distillation.

    摘要翻译: PCT No.PCT / EP97 / 02822 Sec。 371日期:1998年11月12日 102(e)1998年11月12日日期PCT提交1997年5月30日PCT公布。 出版物WO97 / 46529 日期1997年12月11日一种用于纯化式I的粗哌啶的方法,其中R 1至R 4为C 1 -C 6烷基,或R 1和R 2和/或R 3和R 4一起为2至5个碳的CH 2链,其包含 在第一步中,通过蒸馏除去高沸点物质,如果存在,则从粗哌啶衍生出水; 在第二步中,以作为还原剂的第一步产物为基准添加0.01〜5重量% 并且在第三步骤中,通过蒸馏分离哌啶。

    Preparation of 4-amino-2,2,6,6-tetramethylpiperidine (TAD) via
2,2,6,6-tetramethyl-4-�(2,2,6,6-tetramethyl-4-piperidylidene)
amino!piperidine as intermediate
    53.
    发明授权
    Preparation of 4-amino-2,2,6,6-tetramethylpiperidine (TAD) via 2,2,6,6-tetramethyl-4-�(2,2,6,6-tetramethyl-4-piperidylidene) amino!piperidine as intermediate 失效
    通过2,2,6,6-四甲基-4 - [(2,2,6,6-四甲基-4-哌啶基)氨基]哌啶制备4-氨基-2,2,6,6-四甲基哌啶(TAD) 作为中间体

    公开(公告)号:US5859250A

    公开(公告)日:1999-01-12

    申请号:US959165

    申请日:1997-10-28

    申请人: Manfred Julius

    发明人: Manfred Julius

    CPC分类号: C07D211/72 C07D211/58

    摘要: A description is given, as an alternative to known processes, of a process for preparing 4-amino-2,2,6,6-tetramethylpiperidine (TAD) of the formula (I) ##STR1## which comprises the steps of reacting without catalysis, in a first step, 2,2,6,6-tetramethylpiperidine-4-one(TAA) of the formula II ##STR2## with TAD to form 2,2,6,6-tetramethyl4�(2,2,6,6tetramethyl-4-piperidylidene)- amino!piperidine (imine III) of the formula III below ##STR3## and of reacting, in a further step, the imine (III) with ammonia and hydrogen in the presence of a hydrogenation catalyst to give 2 mol equivalents of TAD.

    摘要翻译: 作为已知方法的替代方案,给出了制备式(I)所示的4-氨基-2,2,6,6-四甲基哌啶(TAD)的方法(I),其包括以下步骤: 在没有催化的情况下反应,在第一步中,将式II(II)的2,2,6,6-四甲基哌啶-4-酮(TAA)与TAD反应形成2,2,6,6-四甲基-4 [( 2,2,6,6-四甲基-4-哌啶基) - 氨基]哌啶(亚胺III),亚胺(III)与氨和氢在氢化催化剂的存在下反应,得到2摩尔当量的TAD。