A quick and regioselective access of spirooxindole‐oxazoline by reaction of isatin and isocyanoacetate “on water”

Rankan, Chandran; Marimuthu, Prabhakaran Santhi; Tiwari, Keshri Nath

doi:10.1002/jhet.3953

Cited by 3 publications

(1 citation statement)

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“…of 1,4-diazabicyclo[2.2.2]octane (DABCO) as the base catalyst (Scheme 7). Mild reaction conditions, operational simplicity, easy purification procedure, broad substrate scope, high yield (up to 70%), and high atom economy are the major advantages of this green protocol (Rankan et al, 2020). the catalyst, via condensation reaction between indole 22 and isatin 1 compounds.…”

Section: Water As a Solventmentioning

confidence: 99%

Recent Advances in Green Approaches for Synthesis of Oxindole Derivatives

K.G.U.R. Kumarasinghe,

H.H.Kandambi,

D.M.T.A.Samaradiwakara

2023

VJScience

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Oxindole derivatives are nitrogen-containing, five-membered heterocyclic molecules found in both natural and synthetic substances with diverse biological functions. Owing to their pharmaceutical and therapeutic characteristics, oxindoles have received remarkable attention, and various oxindole-containing substances can be synthesized using many different approaches. With the discovery of the importance of oxindole derivatives in medicinal chemistry, mainly in drug synthesis, the demand for finding sustainable protocols has increased, as most classical methods have their limitations and flaws. Hence, it is crucial to establish efficient and sustainable techniques that are safe, cost-effective, have low energy consumption, and cause minimal environmental impact. Nowadays, the use of green solvents in organic synthesis has received much attention because they prevent the formation of waste, are environmentally friendly, and have easy work-up procedures. Green solvents such as water, deep eutectic solvents, ionic liquids, and polyethylene glycol can substitute hazardous solvents. Microwave irradiation, visible-light irradiation, electrochemical methods, and multi-component synthesis are all described under green approaches. Most of these approaches allow the reaction to proceed rapidly while releasing minimal waste into the environment. Recent discoveries in green chemistry applications can be considered a turning point in organic synthesis. This review focuses on promising green approaches, used for the synthesis of oxindole derivatives, carried out in recent years with typical examples in two sections: green solvents and green techniques. Keywords- Oxindole derivatives, Green solvents, Green techniques, Sustainable chemistry, Solvent-free.

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Section: Water As a Solventmentioning

confidence: 99%