一种由 2-炔基喹啉-3-腈和钠合成噻吩并[4,3- b ]喹啉-1-酮和吡咯并[3,4- b ]喹啉-1-酮的新型、简单且环保的策略已经描述了在室温下无催化剂条件下的硫化物 (Na 2 S·9H 2 O)。在这个反应中,一种容易获得的无机盐(Na 2 S·9H 2 O)作为硫源,导致生成多种官能化的硫代吡喃并[4,3 - b ]喹啉-1-酮和吡咯并[3,4 - b ]quinolin-1-ones 通过硫化、环化和空气氧化获得中等至极好的产率。
在腈纶或酰胺基团形式的功能化分子中可持续引入氮基是至关重要的,因为在许多生命科学分子,天然产物和材料中都发现了含氮基序。因此,非常需要使用具有成本效益的催化剂和绿色试剂从容易获得的起始原料合成腈和酰胺的方法。就这一点而言,本文报道了在1 bar O 2的存在下,由醛和氨水进行的纳米级氧化铁催化的腈和伯酰胺的环境友好合成。或空气。在温和的反应条件下,该铁催化的需氧氧化过程继续进行,以合成功能化且结构多样的芳族,脂族和杂环腈。另外,应用该铁基方案,还已经在水介质中制备了伯酰胺。
Synthesis of four series of quinoline‐based heterocycles by reacting 2‐chloroquinoline‐3‐carbonitriles with various types of isocyanides
作者:Zahra Tanbakouchian、Mohammad Ali Zolfigol、Behrouz Notash、Maryam Ranjbar、Morteza Shiri
DOI:10.1002/aoc.5024
日期:2019.8
Four distinct sets of functionalized quinolines were synthesized by reacting2‐chloroquinoline‐3‐carbonitriles with varioustypes of isocyanides under appropriate conditions. The palladium‐catalysed reaction of less hindered aliphatic and aromatic isocyanides with 2‐chloroquinoline‐3‐carbonitriles yielded 2‐alkyl(aryl)‐1‐imino‐1H‐pyrrolo[3,4‐b]quinolin‐3(2H)‐one derivatives; however, the catalysed
在适当的条件下,通过使2-氯喹啉-3-腈与各种类型的异氰酸酯反应,合成了四组不同的官能化喹啉。受阻较少的脂族和芳族异氰酸酯与2-氯喹啉-3-腈的钯催化反应生成2-烷基(芳基)-1-亚氨基-1 H-吡咯并[3,4- b ]喹啉-3(2 H) -一阶导数; 然而,受阻较严重的异氰酸酯(如叔丁基异氰酸酯)的催化反应产生了相应的3-氰基喹啉-2-羧酰胺。有趣的是,在Cs 2 CO 3存在下,氯喹啉-3-腈与异氰基乙酸乙酯反应生成咪唑[1,5- a]喹啉衍生物;值得注意的是,甲苯磺酰基甲基异氰化物在相同条件下形成了前所未有的2-甲苯磺酰基-3-氰基喹啉。
Pd-Catalyzed One-Pot Stepwise Synthesis of Benzo[<i>b</i>][1,6]naphthyridines from 2-Chloroquinoline-3-carbonitriles Using Sulfur and Amines As Nucleophiles
作者:Ritush Kumar、Mrityunjaya Asthana、Radhey M. Singh
DOI:10.1021/acs.joc.7b02147
日期:2017.11.3
A palladium-catalyzed one-pot stepwise coupling-annulation reaction of 2-chloroqunoline-3-carbonitriles enabled the direct synthesis of sulfur-substituted benzo[b][1,6]naphthyridines via multiple bond formation. The reaction provided an unusual mode for cyclization as sodium sulfide, a soft nucleophile, preferred to attack on the carbon of the nitrile group rather than on the C–C triple bond. The developed
钯催化的2-氯喹啉-3-甲腈的一锅一步逐步偶联-环化反应能够通过多键形成直接合成硫取代的苯并[ b ] [1,6]萘啶。该反应为环化提供了一种不寻常的模式,因为它是一种柔软的亲核试剂,即硫化钠,更倾向于攻击腈基的碳而不是CC三键。用仲胺作为亲核试剂扩展了已发展的化学反应,从而提供了氮取代的苯并[ b ] [1,6]萘吡啶,而伯胺则提供了加氢胺化产物。加氢产物转化为苯并[ b]] [1,6]萘啶酮经由碱基介导的环化反应。所开发的协议具有廉价且易于合成的起始材料,易于操作以及对各种基材的高效率和耐受性的特点。
Palladium-catalyzed one-pot synthesis of benzo[b][1,6]naphthyridines via Sonogashira coupling and annulation reactions from 2-chloroquinoline-3-carbonitriles
作者:Radhey M. Singh、Ritush Kumar、Neha Sharma、Mrityunjaya Asthana
DOI:10.1016/j.tet.2013.08.072
日期:2013.11
Palladium-catalyzed one-pot synthesis of 1,3-disubstituted benzo[b][1,6]naphthyridines and [1,6]naphthyridines has been described from easily accessible precursors, 2-chloroquinoline-3-carbonitriles and 2-chloropyrido-3-carbonitrile via sequential additions of palladium-catalyst for Sonogashira-coupling and the following annulations in good to excellent yields. A plausible mechanism for annulation
的钯-催化的一锅合成1,3-二取代苯并[ b ] [1,6]萘啶和[1,6]萘啶已经从容易获得的前体,2-氯喹啉-3-腈和所述的2- chloropyrido-通过依次添加钯催化剂进行Sonogashira偶联,以及随后的环化反应,可制得3-腈,收率良好。讨论了一种可行的圆环化机制。
Chlorination of 2-Chloroquinoline-3-carbaldehydes
作者:Zoltán Cziáky
DOI:10.1080/00397919108021784
日期:1991.9
Abstract Reactions of 2-chloroquinoline-3-carbaldehydes (1) with chlorine, thionylchloride and sulphuryl chloride are investigated. Preparation of 2-chloroquinoline-3-carbonyl chlorides (2) and 2-chloro-3-dichloromethylquinolines (5) as products of these reactions is described.
An alternative synthesis of pyrimido[4,5-b]quinoline-4-ones via metal-free amination in water and Vilsmeier–Haack cyclization
作者:Radhey M. Singh、Neha Sharma、Ritush Kumar、Mrityunjaya Asthana、Shraddha Upadhyay
DOI:10.1016/j.tet.2012.10.004
日期:2012.12
Two-step synthesis of pyrimido[4,5-b]quinoline-4-ones is described from 2-chloroquinoline-3-carbonitries via amination and cyclization reactions, respectively. The amination reactions proceeded much faster in water via simple SNAr displacement reactions of chlorine. The cyclization reactions using Vilsmeier reagent at 60 °C gave the best yield of the products. The isolation of starting compound from
从2-氯喹啉-3-碳酸盐通过胺化和环化反应分别描述了嘧啶[4,5 - b ]喹啉-4-酮的两步合成。通过简单的氯的S N Ar置换反应,胺化反应在水中的进行速度大大加快。使用Vilsmeier试剂在60°C下进行环化反应可得到最佳的产物收率。从环化产物与I 2 / K 2 CO 3的反应中分离起始化合物为环化产物的结构提供了进一步的化学证明。提出了合理的环化机理。