One-pot multicomponent route to propargylamines using ferric hydrogensulfate

Ionic liquid‐assisted synthesis of 2‐amino‐3‐cyano‐4H‐chromenes: A sustainable overview

“…Different kinds of catalytic reagents (metal-based or metal-free basic and acidic catalysts, heterogeneous catalysts, phase transfer catalysts) have been employed for the multicomponent reaction (MCR) to produce the chromene derivatives (Scheme 1). [79][80][81][82][83][84][85][86][87][88][89][90][91][92] In this regard, most of these techniques display some major drawbacks such as the use of toxic solvents, unexpected conditions, product separation, and purification. Above all, the catalytic composites are not considered eco-friendly and some difficulties are found during the recyclability of the catalyst.…”

A Green One-Pot Synthesis of Benzochromeno-Pyrazoles Catalyzed by a Series of Metal Triflates

“…To continue our work in the synthesis of heterocyclic compounds via MCR reactions 12,13 , herein, we wish to report an efficient and green synthetic route to chromenopyrazole derivatives via one-pot three component condensation of aldehydes, 3-methyl-1Hpyrazol-5(4H)-one and α-or β-naphthol catalyzed by a series of metal triflates (Scheme 1).…”

Preparation of neutral ionic liquid [2-Eim] OAc with dual catalytic-solvent system roles for the synthesis of 2-amino-3-cyano-7-hydroxy-4-(aryl)-4H-chromene derivatives

“…Other properties such as laser dyes and fluorescence [30], pigments and cosmetics [31], are well known for decades. There have already been several references related to the synthesis of 4H-chromene derivatives using various catalysts are also reported [50][51][52][53][54]. However, there are still many problems in these reported catalysis methods, such as the use of expensive reagents, catalyst activation difficulty, long reaction time, low selectivity, environmental hazards, acidic or basic conditions and catalyst recycling problem.…”