会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 1. 发明授权
    • 3-Acetyl-1-alkyl-1,4-dihydro-4-oxo-1,8-naphthyridines and intermediates
    • 3-乙酰基-1-烷基-1,4-二氢-4-氧代-1,8-萘啶和中间体
    • US3895017A
    • 1975-07-15
    • US45392874
    • 1974-03-22
    • STERLING DRUG INC
    • LESHER GEORGE YBRUNDAGE RUTH PAULINE
    • C07D471/04C07D31/36
    • C07D471/04
    • Process of reacting 2-amino-6-Q''-pyridine (I) with lower-alkyl (lower-alkoxy)methyleneacetoacetate (II) to produce lower-alkyl Alpha -(6-Q''-2-pyridylaminomethylene)acetoacetate (III''), heating lower-alkyl Alpha -(6-Q-2-pyridylaminomethylene)acetoacetate (III), to produce 3-acetyl-1,4-dihydro-7-Q-4-oxo-1,8naphthyridine (IV) which is tautomeric with 3-acetyl-4-hydroxy-7Q-1,8-naphthyridine (IVA), reacting IV (or IVA) with a loweralkylating agent to produce 3-acetyl-1-(lower-alkyl)-1,4-dihydro7-Q-4-oxo-1,8-naphthyridine (V) and converting V to 1-(loweralkyl)-1,4-dihydro-7-Q-4-oxo-1,8-naphthyridine-3-carboxylic acid (VI), where Q is lower-alkyl, hydroxymethyl, loweralkanoyloxymethyl, 4(or 3)-pyridyl or 4(or 3)-pyridyl having one or two lower-alkyl substituents, and Q'' is like Q but excluding lower-alkanoyloxymethyl. The compounds of formula VI are known antibacterial agents. Also given are alternative routes of preparing III and IV where Q is lower-alkanoyloxymethyl by reacting the N-oxides of III and IV, respectively, where Q is methyl with a lower-alkanoic acid anhydride.
    • 使2-氨基-6-Q'-吡啶(I)与低级烷基(低级烷氧基)亚甲基乙酰乙酸酯(II)反应生成低级烷基α-(6-Q'-2-吡啶基氨基亚甲基)乙酰乙酸酯(III' ),加热低级烷基α-(6-Q-2-吡啶基氨基亚甲基)乙酰乙酸酯(III),得到3-乙酰基-1,4-二氢-7-Q-4-氧代-1,8-萘啶(IV) 其与3-乙酰基-4-羟基-7-Q-1,8-二氮杂萘(IVA)是互变异构体,使IV(或IVA)与低级烷基化剂反应以产生3-乙酰基-1-(低级烷基) -1,4-二氢-7-Q-4-氧代-1,8-二氮杂萘(V)并将V转化为1-(低级烷基)-1,4-二氢-7-Q-4-氧代-1 (VI),其中Q是具有一个或两个低级烷基取代基的低级烷基,羟甲基,低级烷酰氧基甲基,4(或3) - 吡啶基或4(或3) - 吡啶基, Q'如Q,但不包括低级烷酰氧基甲基。 式VI化合物是已知的抗菌剂。 还给出了制备III和IV的替代途径,其中Q是低级烷酰氧基甲基,分别通过使III和IV的N-氧化物与低级链烷酸酐反应。