Benzimidazoles and pharmaceutical preparations containing these compounds
    5.
    发明授权
    Benzimidazoles and pharmaceutical preparations containing these compounds 失效
    苯并咪唑和含有这些化合物的药物制剂

    公开(公告)号:US5039675A

    公开(公告)日:1991-08-13

    申请号:US497223

    申请日:1990-03-22

    CPC分类号: C07D403/04

    摘要: New benzimidazoles correponding to the general formula I ##STR1## are described, in which the pyridazinone ring is attached in the 5- or 6- position of the benzimidazole ring and R.sup.1 denotes a hydrogen atom or a straight chained or branched C.sub.1 to C.sub.4 alkyl group, R.sup.2 denotes a hydrogen atom, a straight chained or branched C.sub.1 to C.sub.4 alkyl group, a C.sub.1 to C.sub.4 alkoxy group, a hydroxy group, a halogen atom, an amino group or a nitro group, A denotes a hydrogen atom, a group of the formula ##STR2## wherein R.sup.3 denotes a hydrogen atom, an optionally substituted C.sub.1 to C.sub.4 alkyl group or a C.sub.1 to C.sub.4 alkoxy group and B denotes a cyano group, a benzoyl group or a phenylsulphonyl group, or A denotes a group of the formula ##STR3## in which m has the value 2 or 3 and n represents an integer from 1 to 6, and the physiologically acceptable salts thereof as well as processes for their preparation and pharmaceutical preparations. containing these compounds These compounds are new, effective, positive inotropic substances which do not act by the mechanism of phosphodiesterase inhibition.

    Process for the preparation of nitroethene derivatives
    6.
    发明授权
    Process for the preparation of nitroethene derivatives 失效
    硝基乙烯衍生物的制备方法

    公开(公告)号:US4968808A

    公开(公告)日:1990-11-06

    申请号:US176757

    申请日:1988-04-01

    IPC分类号: C07D277/28 C07D307/52

    CPC分类号: C07D307/52 C07D277/28

    摘要: A new process for the preparation of the nitroethane derivatives, ranitidine and nizatidine, is described which takes place via intermediate products and enables the said compounds to be prepared with a higher degree of purity. Another advantage is that in contrast to the known processes, it is not accompanied by the liberation of the highly toxic and malodorous compound, methylmercaptan.

    摘要翻译: 描述了制备硝基乙烷衍生物,雷尼替丁和尼札替丁的新方法,其通过中间产物进行,并使所述化合物能够以更高的纯度制备。 另一个优点是,与已知的方法相比,它不伴随着高毒性和恶臭化合物甲硫醇的释放。