申请人:Sterling Drug Inc.
公开号:US04137227A1
公开(公告)日:1979-01-30
Compounds useful as antibacterial agents are 1-R-1,4-dihydro-4-oxo-7-(BN--N.dbd.N)-3-quinolinecarboxylic acids (I), wherein: (a) BN is dimethylamino where R is methyl, ethyl, n-propyl, n-butyl, n-pentyl or n-octyl; (b) BN is diethylamino where R is n-propyl; or, (c) BN is 4-methyl-1-piperazinyl where R is ethyl. These compounds are prepared by reacting lower-alkyl 7-amino-1-R-1,4-dihydro-4-oxo-3-quinolinecarboxylate (II) with a mineral acid and an alkali nitrite in aqueous medium to produce the corresponding diazonium salt of said 7-aminoquinoline, reacting said diazonium salt with an amine of the formula BNH in the presence of an acid-acceptor to produce lower-alkyl 1-R-1,4-dihydro-4-oxo-7-(BN--N.dbd.N)-3-quinolinecarboxylate and hydrolyzing said 3-quinolinecarboxylate to produce the corresponding 3-carboxylic acid (I). The intermediate lower-alkyl 7-amino-1-R-1,4-dihydro-4-oxo-3-quinolinecarboxylate (II) are prepared in several steps by conventional means starting with m-aniline.
有用作抗菌剂的化合物为1-R-1,4-二氢-4-氧代-7-(BN--N.dbd.N)-3-喹啉羧酸(I),其中:(a)当R为甲基、乙基、正丙基、正丁基、正戊基或正辛基时,BN为二甲基氨基;(b)当R为正丙基时,BN为二乙基氨基;(c)当R为乙基时,BN为4-甲基-1-哌嗪基。这些化合物通过将较低烷基7-氨基-1-R-1,4-二氢-4-氧代-3-喹啉羧酸酯(II)与矿酸和碱性硝酸盐在水介质中反应,制备出相应的7-氨基喹啉的重氮盐,将该重氮盐与式为BNH的胺在酸受体的存在下反应,制备出较低烷基1-R-1,4-二氢-4-氧代-7-(BN--N.dbd.N)-3-喹啉羧酸酯,并水解该3-喹啉羧酸酯以制备相应的3-羧酸(I)。中间体较低烷基7-氨基-1-R-1,4-二氢-4-氧代-3-喹啉羧酸酯(II)通过常规方法从间苯二胺开始进行数步制备。