6-amino-1-ethyl-7-mercapto-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid | 63541-08-2

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二氮杂萘
• 英文名称: 6-amino-1-ethyl-7-mercapto-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid
• 英文别名: 6-amino-1-ethyl-4-oxo-7-thioxo-1,4,7,8-tetrahydro-[1,8]naphthyridine-3-carboxylic acid；6-amino-1-ethyl-4-oxo-7-sulfanylidene-8H-1,8-naphthyridine-3-carboxylic acid
• CAS: 63541-08-2
• 化学式: C₁₁H₁₁N₃O₃S
• 分子量: 265.293
• InChiKey: ZVRGFDHIURWFRK-UHFFFAOYSA-N

物化性质

• 熔点：
  >300 °C(Solv: N,N-dimethylformamide (68-12-2))
• 沸点：
  430.1±55.0 °C(Predicted)
• 密度：
  1.58±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  0.99
• 重原子数：
  18.0
• 可旋转键数：
  2.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.18
• 拓扑面积：
  98.21
• 氢给体数：
  3.0
• 氢受体数：
  6.0

反应信息

• 作为反应物：
  描述：

  6-amino-1-ethyl-7-mercapto-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid 在 sodium hydroxide 作用下， 以 四氯化碳 、 乙醇 为溶剂， 生成 5-ethyl-8-oxo-5,8-dihydro-thiazolo[5,4-b][1,8]naphthyridine-7-carboxylic acid
  参考文献：
  名称：

  Synthesis of antimicrobial agents. III. Synthesis and antimicrobial activities of thiazolo[5,4-b]naphthyridine derivatives.

  摘要：

  为了寻找新型抗菌剂，合成了一系列含有新环体系的化合物，即2-取代的8-乙基-5，8-二氢-5-氧代噻唑并[5，4-b]萘啶-6-羧酸及其相关衍生物。6-氨基-1-乙基-7-巯基-1，4-二氢-4-氧代萘啶-3-羧酸（2）与酸、酸酐、酰氯和乙基黄原酸酯反应，得到了多种噻唑并[5，4-b]萘啶衍生物。在乙酸中回流乙基7-氯-1-乙基-6-硝基-1，4-二氢-4-氧代萘啶-3-羧酸酯（16）与KSCN，直接得到了噻唑环化产物19。8-乙基-2-甲硫基-5，8-二氢-5-氧代噻唑并[5，4-b]萘啶-6-羧酸（11）与二甲基硫酸反应，根据反应条件的不同，得到了不同的产物（13b、25和26）。本工作中合成的一些化合物在体外对革兰氏阴性和革兰氏阳性细菌显示出高活性。

  DOI：

  10.1248/cpb.27.410

文献信息

• Synthesis of antimicrobial agents. V. Synthesis and antimicrobial activities of some heterocyclic condensed 1,8-naphtyridine derivatives.
  作者：NORIO SUZUKI

  DOI：10.1248/cpb.28.761

  日期：——

  In order to search for compounds with higher activity than thiazolo [5, 4-b], imidazo-[4, 5-b] and triazolo [4, 5-b] [1, 8] naphthyridine derivatives against Ps. aeruginosa, we synthesized some heterocyclic condensed 1, 8-naphthyridine derivatives by using bifunctional 6, 7-disubstituted 1, 8-naphthyridine as a starting material. Thiadiazolo [5, 4-b] and oxazolo [5, 4-b] [1, 8] naphthyridine derivatives (3) and (5) were prepared by hydrolysis of the 6-amino-7-chloro-3-ester (1) with sodium hydroxide or sodium hydrosulfide, followed by cyclization with acetic anhydride or sodium nitrite. Pyrazolo [3, 4-b] and isothiazolo [5, 4-b] [1, 8] naphthyridine derivatives (12) and (14) were synthesized by ring cyclization of the 7-chloro-6-formyl-3-ester (10) with methyl hydrazine or ethanolic ammonia in the presence of sulfur, followed by hydrolysis. Thieno and furo [2, 3-b] [1, 8] naphthyridine derivatives (20) and (31) were prepared through a series of reaction steps, e.g. diazotization, reduction of the nitrile ester (7) or (24), ring cyclization by means of ethyl mercaptoacetate or ethyl bromomalonate, hydrolysis and decarboxylation. The compounds obtained were tested for antimicrobial activities in vitro. 8-Ethyl-5, 8-dihydro-5-oxothieno [2, 3-b] [1, 8] naphthyridine-6-carboxylic acid (20) exhibited the highest activities among these compounds against many gram-negative bacteria, including Ps. aeruginosa, and against gram-positive bacteria.

  为了寻找比噻唑并[5，4-b]、咪唑并[4，5-b]和三唑并[4，5-b][1，8]萘啶衍生物对绿脓杆菌具有更高活性的化合物，我们以双官能团 6，7-二取代 1，8-萘啶为起始原料，合成了一些杂环缩合 1，8-萘啶衍生物。噻二唑并[5，4-b]和噁唑并[5，4-b] [1，8]萘啶衍生物（3）和（5）是通过氢氧化钠或硫氢化钠水解 6-氨基-7-氯-3-酯（1），然后用乙酸酐或亚硝酸钠环化而制备的。吡唑并[3，4-b]和异噻唑并[5，4-b][1，8]萘啶衍生物（12）和（14）是在有硫存在的情况下，通过 7-氯-6-甲酰基-3-酯（10）与甲基肼或乙醇氨进行环化，然后水解而合成的。噻吩和呋喃 [2, 3-b] [1, 8] 萘啶衍生物 (20) 和 (31) 是通过一系列反应步骤制备的，例如重氮化、腈酯 (7) 或 (24) 还原、巯基乙酸乙酯或溴丙二酸乙酯环化、水解和脱羧。得到的化合物在体外进行了抗菌活性测试。在这些化合物中，8-乙基-5，8-二氢-5-氧代噻吩并[2，3-b] [1，8] 萘-6-羧酸（20）对包括绿脓杆菌在内的多种革兰氏阴性菌和革兰氏阳性菌的活性最高。