Efficient synthesis of functionalized benzo[b][1,8]naphthyridine derivatives via three-component reaction catalyzed by L-proline

The regioselective one-pot four-component synthesis of novel functionalized 4H-pyrano[2, 3-b]quinoline derivatives using DABCO as a homogeneous organocatalyst

This study deals with the synthesis of the regioselective and facile domino one-pot four-component reaction of 2-chloroquinoline-3-carbaldehydes, 1, 3-cyclodione compounds (as cyclic active methylene), ethyl acetoacetate (as β-keto ester), and hydrazine hydrate in the presence of DABCO as a homogeneous organocatalyst yielding a novel series of 4H-pyrano[2, 3-b]quinolones. This multicomponent reaction has some advantages; the significant one is C-O bond formation under metal-free conditions. Other benefits include simple procedure, mild and green condition, high yield, easy purification, and excellent regioselectivity. All polycyclic products (7a-k, 11 new compounds) were characterized by IR, 1H NMR, 13C NMR, and mass spectra.

Phase-transfer catalyzed Michael/ammonolysis cascade reactions of enaminones and olefinic azlactones: a new approach to structurally diverse quinoline-2,5-diones

Michael/ammonolysis cascade reactions between cyclohexane-1,3-dione-derived enaminones and olefinic azlactones via phase-transfer catalysis have been developed. This method provides rapid access to a suite of architecturally complex and diverse quinoline-2,5-diones bearing a secondary amide group at the C-3 position in moderate to excellent yields (53-94%) and with excellent diastereoselectivities (>99 : 1 dr in most cases). The achievement of a preparative-scale reaction and the diverse product derivatization that can be obtained highlight the application potential of this protocol both in academic and industrial settings. An investigation of the reaction mechanism implies that tetrabutylammonium hydroxide may be the actual catalyst during this cascade reaction.

1,8-Naphthyridine Derivatives: A Privileged Scaffold for Versatile Biological Activities

1, 8- Naphthyridine nucleus belongs to significant nitrogen-containing heterocyclic compounds which has garnered the interest of researchers due to its versatile biological activities. It is known to be used as an antimicrobial, anti-psychotic, anti-depressant, anti-convulsant, anti- Alzheimer's, anti-cancer, analgesic, anti-inflammatory, antioxidant, anti-viral, anti-hypertensive, antimalarial, pesticides, anti-platelets, and CB2 receptor agonist, etc. The present review highlights the framework of biological properties of synthesized 1, 8-naphthyridine derivatives developed by various research groups across the globe.

Efficient three-component synthesis of 5-(6-hydroxy-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5,12-dihydrobenzo[b]pyrimido[5,4-g][1,8]naphthyridine-2,4(1H,3H)-dione

1,8-Naphthyridine derivatives are important heterocyclic compounds. A facile and efficient one-pot procedure for the synthesis of 5-(6-hydroxy-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-5,12-dihydrobenzo[b]pyrimido[5,4-g][1,8]naphthyridine-2,4 (1H,3H)-dione (3) via a three-component reaction of barbituric acid, 2-chloro-3-formylquinoline and ammonia under basic conditions is described.

Recent advances in the chemistry of 2-chloroquinoline-3-carbaldehyde and related analogs

This review highlights the recently cited research data in the literature on the chemistry of 2-chloroquinoline-3-carbaldehyde and related analogs and their applications over the period from 2013 to 2017. It covers: synthesis of quinoline ring systems and reactions adopted to construct fused or binary quinoline-cord heterocyclic systems. The biological evaluation and the synthetic applications of the target compounds were illustrated.

Synthesis and evaluation of new chromene based [1,8]naphthyridines derivatives as potential antimicrobial agents

Novel chromeno[4,3-f][1,8]naphthyridines derivatives were prepared by multicomponent reaction between 2-((sub)amino)quinoline-3-carbaldehyde 1a–f/2a–f, ethyl 2-cyanoacetate 3 and cyclohexane-1,3-dione 4 in ethanol with l-proline as a catalyst.

Efficient synthesis and evaluation of antitumor activities of novel functionalized 1,8-naphthyridine derivatives

An efficient synthesis of novel functionalized 1,8-naphthyridine and chromeno[2,3-b]quinoline derivatives via cascade reaction of 2-chloroquinoline-3-carbaldehyde and enaminones or cyclic 1,3-dicarbonyl compounds was developed. All of the 1,8-naphthyridine derivatives synthesized were evaluated for their antiproliferative properties in vitro against cancer cells and several compounds were found to have high activities.

One-pot synthesis of functionalized 4-hydroxy-3-thiomethylcoumarins: detection and discrimination of Co2+ and Ni2+ ions

A variety of 4-hydroxy-3-thiomethylcoumarin derivatives were synthesized via a one-pot three-component reaction catalysed by l-proline at room temperature. One of the derivative was used as fluorescence probe to monitor and distinguish Co²⁺ and Ni²⁺.

Highly selective synthesis of functionalized polyhydroisoquinoline derivatives via a three-component domino reaction

Two series of novel functionalized polyhydroisoquinoline derivatives have been synthesized via the three-component domino reaction under microwave irradiation conditions.

Selective synthesis of polyfunctionalized hydroisoquinoline derivatives via a three-component domino reaction

Two series of novel polyfunctionalized hydroisoquinoline derivatives have been synthesized via a three-component domino reaction under microwave irradiation conditions.