Process for the preparation of substituted 3-amino-2 (benzoyl)-acrylic
acid esters, and a process for the preparation of intermediates for
antibacterial active compounds from these compounds
    1.
    发明授权
    Process for the preparation of substituted 3-amino-2 (benzoyl)-acrylic acid esters, and a process for the preparation of intermediates for antibacterial active compounds from these compounds 失效
    取代的3-氨基-2(苯甲酰基) - 丙烯酸酯的制备方法,以及由这些化合物制备抗菌活性化合物的中间体的方法

    公开(公告)号:US5011971A

    公开(公告)日:1991-04-30

    申请号:US363198

    申请日:1989-06-08

    摘要: Process for the preparation of substituted 3-amino-2-(benzoyl)-acrylic acid esters of the formula I ##STR1## in which R.sub.1 denotes an alkyl radical with 1 to 4 C atoms, X.sub.1 denotes halogen, in particular fluorine or chlorine, X.sub.2, X.sub.3, X.sub.4 and X.sub.5 denote hydrogen, halogen, in particular fluorine or chlorine, an alkyl radical having 1-4 C atoms or an alkoxy radical having 1-4 C atoms in the alkyl chain, by selectively reducing a substituted 2-cyano-3-hydroxy-3(phenyl)acrylic acid ester of the formula II ##STR2## in which R.sub.1, X.sub.1, X.sub.2, X.sub.3, X.sub.4 and X.sub.5 have the meaning given above, and a process for the preparation of intermediate products for antibacterially active compounds from these compounds.

    摘要翻译: 用于制备式I的取代的3-氨基-2-(苯甲酰基) - 丙烯酸酯的方法,其中R 1表示具有1至4个C原子的烷基,X 1表示卤素,特别是氟或氯 ,X2,X3,X4和X5表示氢,卤素,特别是氟或氯,具有1-4个碳原子的烷基或烷基链中具有1-4个碳原子的烷氧基,通过选择性还原取代的2- 其中R1,X1,X2,X3,X4和X5具有上述含义的式II的氰基-3-羟基-3(苯基)丙烯酸酯,以及制备中间产物的方法 来自这些化合物的抗菌活性化合物。

    Process for the preparation of allantoin
    2.
    发明授权
    Process for the preparation of allantoin 失效
    制备ALLANTOIN的方法

    公开(公告)号:US5196545A

    公开(公告)日:1993-03-23

    申请号:US714281

    申请日:1991-05-30

    CPC分类号: C07D233/88

    摘要: Process for the preparation of allantoin in a two-stage reaction by reaction of methyl glyoxylate methyl hemiacetal with urea in the presence of an inorganic acid at a pH-value of 1.0-2.0 and carrying out the ring-closure reaction at a pH-value of 7.0 to 9.0 in a second reaction stage.

    摘要翻译: 通过甲基乙醛酸甲酯半缩醛与尿素在无机酸的存在下,在pH值为1.0〜2.0的条件下进行两步反应制备尿囊素的方法,并以pH值进行闭环反应 在第二反应阶段为7.0至9.0。