Method for preparing carboxamides
    16.
    发明授权
    Method for preparing carboxamides 失效
    羧酰胺的制备方法

    公开(公告)号:US5925757A

    公开(公告)日:1999-07-20

    申请号:US912625

    申请日:1997-07-23

    申请人: Alan K. Mallams

    发明人: Alan K. Mallams

    CPC分类号: C07D401/12 C07D401/14

    摘要: The invention relates to a process for producing a carboxamide of the formula ##STR1## which comprises reacting ##STR2## with an excess of urea in water, wherein the variables in the above formulae are as described herein.

    摘要翻译: 本发明涉及一种制备下式的甲酰胺的方法,其包括与水中过量的尿素反应,其中上述式中的变量如本文所述。

    "> Di and tri-O-acetyl-
    17.
    发明授权
    Di and tri-O-acetyl-"O-iso-valeryl-23-O-demycinosyl tylosins, hydrazone derivatives thereof and processes for their preparation 失效
    二和三-O-乙酰基-O-异戊酰基-23-O-脱霉素基泰乐菌素,其腙衍生物及其制备方法

    公开(公告)号:US4851518A

    公开(公告)日:1989-07-25

    申请号:US812148

    申请日:1985-12-23

    IPC分类号: C07H17/08

    CPC分类号: C07H17/08 Y02P20/582

    摘要: There are disclosed novel di- and tri-O-acetyl-23-O-demycinosyl-4"-O-iso-valeryltylosins and the pharmaceutically acceptable salts thereof, which have improved activity as antibacterials and provide higher blood levels than other tylosin derived compounds. These compounds have the following structural formula ##STR1## wherein R is acetyl or hydrogen and z is for example O or ##STR2##Processes for selectively deacylating the 2' and 4"-positions of 3,2',4",4'"-tetra-O-acyltylosin or 2',4",4'"-tri-O-acyltylosin and for the selective acylation of 2',4"-di-O-acyltylosin and 2',4",4'"-tri-O-acyltylosin are also disclosed.

    摘要翻译: 已经公开了新的二 - 和三-O-乙酰基-23-O-脱戊霉素-4'-O-异戊酰基赤霉素及其药学上可接受的盐,其具有改善的作为抗菌剂的活性并且提供比其他泰乐菌素衍生的更高的血液水平 化合物。 这些化合物具有以下结构式,其中R是乙酰基或氢,z是例如O或用于选择性脱酰基3,2'和4'的2'和4“ - 位的方法 ',4“' - 四-O-酰基烟曲蛋白或2',4”,4“' - 三-O-酰基黄曲霉素,并选择性酰化2',4” - 二-O-酰基黄曲霉素 还公开了2',4“,4”' - 三-O-酰基烟曲蛋白。