Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates
    2.
    发明授权
    Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates 有权
    制备2,4-二氧代四氢呋喃-3-羧酸酯的方法

    公开(公告)号:US08318955B2

    公开(公告)日:2012-11-27

    申请号:US12854517

    申请日:2010-08-11

    IPC分类号: C07D307/00

    CPC分类号: C07D307/60

    摘要: Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates of the formula (I) and/or (I′) comprising the reaction of a haloacetyl chloride compound of the formula (II) with a malonic ester of the formula (III) in which Hal, R1 and R2 have the definitions stated in the application, in the presence of a suitable base and optionally in the presence of a solvent; the addition of a sufficient amount of water to the reaction mixture; and the isolation of the desired 2,4-dioxotetrahydrofuran-3-carboxylate.

    摘要翻译: 制备式(I)和/或(I')的2,4-二氧代四氢呋喃-3-羧酸酯的方法,包括式(II)的卤代乙酰氯化合物与式(III)的丙二酸酯在 其中Hal,R 1和R 2具有本申请中所述的定义,在合适的碱存在下,任选地在溶剂存在下; 向反应混合物中加入足量的水; 并分离所需的2,4-二氧代四氢呋喃-3-羧酸乙酯。

    Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates
    4.
    发明申请
    Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates 有权
    制备2,4-二氧代四氢呋喃-3-羧酸酯的方法

    公开(公告)号:US20110060147A1

    公开(公告)日:2011-03-10

    申请号:US12854517

    申请日:2010-08-11

    IPC分类号: C07D307/68

    CPC分类号: C07D307/60

    摘要: Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates of the formula (I) and/or (I′) comprising the reaction of a haloacetyl chloride compound of the formula (II) with a malonic ester of the formula (III) in which Hal, R1 and R2 have the definitions stated in the application, in the presence of a suitable base and optionally in the presence of a solvent; the addition of a sufficient amount of water to the reaction mixture; and the isolation of the desired 2,4-dioxotetrahydrofuran-3-carboxylate.

    摘要翻译: 制备式(I)和/或(I')的2,4-二氧代四氢呋喃-3-羧酸酯的方法,包括式(II)的卤代乙酰氯化合物与式(III)的丙二酸酯在 其中Hal,R 1和R 2具有本申请中所述的定义,在合适的碱存在下,任选地在溶剂存在下; 向反应混合物中加入足量的水; 并分离所需的2,4-二氧代四氢呋喃-3-羧酸乙酯。

    Process for the preparation of 2,2-difluoroethylamine starting from prop-2-en-1-amine
    5.
    发明授权
    Process for the preparation of 2,2-difluoroethylamine starting from prop-2-en-1-amine 失效
    从丙-2-烯-1-胺开始制备2,2-二氟乙胺的方法

    公开(公告)号:US08766012B2

    公开(公告)日:2014-07-01

    申请号:US13292765

    申请日:2011-11-09

    摘要: A process for the preparation of 2,2-difluoroethylamine of the formula (I) CHF2CH2NH2  (I) comprising the stages (i) and (ii): stage (i): reaction of 2,2-difluoro-1-haloethane of the formula (II) CHF2—CH2Hal  (II) in which Hal is chlorine, bromine or iodine, with prop-2-en-1-amine of the formula (III) to give N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) preferably in the presence of an acid scavenger, and stage (ii): removal of the allyl group from the N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) obtained in stage (i) to give 2,2-difluoroethylamine of the formula (I) or a salt thereof.

    摘要翻译: 制备式(I)的2,2-二氟乙胺的方法包括步骤(i)和(ii)的步骤(i):阶段(i):2,2-二氟-1-卤代乙烷的反应 式(II)其中Hal为氯,溴或碘的CHF 2 -CH 2 Hal(II)与式(III)的丙-2-烯-1-胺反应,得到N-(2,2-二氟乙基)丙-2-醇 (IV)的1-烯-1-胺优选在酸清除剂的存在下,和阶段(ii):从N-(2,2-二氟乙基)丙-2-烯-1-醇中除去烯丙基 - 胺,得到式(I)中得到的式(Ⅳ)化合物,得到式(I)的2,2-二氟乙胺或其盐。