Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates
    3.
    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 sodium salts or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylate
    4.
    发明授权
    Process for preparing sodium salts or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylate 有权
    制备4-羟基-2-氧代-2,5-二氢呋喃-3-羧酸钠的钠盐或钾盐的方法

    公开(公告)号:US09056848B2

    公开(公告)日:2015-06-16

    申请号:US14002695

    申请日:2012-02-29

    CPC分类号: C07D307/60 C07D307/68

    摘要: Process for preparing sodium or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters, comprising the reaction of a malonic ester with potassium hydroxide to give the corresponding malonic ester potassium salt of the formula (III) which is then reacted further with a chloroacetic ester to give a compound of the formula (V) followed by a ring closure reaction in which the compound of the formula (V) is reacted with a sodium or potassium alkoxide of the formula ZOR1 where R1, R2, R3 and K are each as defined in the description.

    摘要翻译: 制备4-羟基-2-氧代-2,5-二氢呋喃-3-羧酸酯的钠盐或钾盐的方法,其包括丙二酸酯与氢氧化钾的反应,得到相应的式(III)的丙二酸酯钾盐 ),然后将其与氯乙酸酯进一步反应,得到式(V)化合物,随后闭环反应,其中式(Ⅴ)化合物与式ZOR1的钠或钾醇盐反应,其中R 1 ,R2,R3和K各自如说明书中所定义。

    PROCESS FOR PREPARING SODIUM SALTS OR POTASSIUM SALTS OF 4-HYDROXY-2-OXO-2,5-DIHYDROFURAN-3-CARBOXYLATE
    7.
    发明申请
    PROCESS FOR PREPARING SODIUM SALTS OR POTASSIUM SALTS OF 4-HYDROXY-2-OXO-2,5-DIHYDROFURAN-3-CARBOXYLATE 有权
    制备4-羟基-2-氧代-2,5-二氢呋喃-3-羧酸钠的钠盐或钾盐的方法

    公开(公告)号:US20140148604A1

    公开(公告)日:2014-05-29

    申请号:US14002695

    申请日:2012-02-29

    IPC分类号: C07D307/60

    CPC分类号: C07D307/60 C07D307/68

    摘要: Process for preparing sodium or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters, comprising the reaction of a malonic ester with potassium hydroxide to give the corresponding malonic ester potassium salt of the formula (III) which is then reacted further with a chloroacetic ester to give a compound of the formula (V) followed by a ring closure reaction in which the compound of the formula (V) is reacted with a sodium or potassium alkoxide of the formula ZOR1 where R1, R2, R3 and K are each as defined in the description.

    摘要翻译: 制备4-羟基-2-氧代-2,5-二氢呋喃-3-羧酸酯的钠盐或钾盐的方法,其包括丙二酸酯与氢氧化钾的反应,得到相应的式(III)的丙二酸酯钾盐 ),然后将其与氯乙酸酯进一步反应,得到式(V)化合物,随后闭环反应,其中式(Ⅴ)化合物与式ZOR1的钠或钾醇盐反应,其中R 1 ,R2,R3和K各自如说明书中所定义。

    Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates
    10.
    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。