Sc(OTf)₃catalysed multicomponent synthesis of chromeno[2,3-d]pyrimidinetriones under solvent-free condition

Importance of Hybrid Catalysts toward the Synthesis of 5H-Pyrano[2,3-d]pyrimidine-2-ones/2,4-diones (Thiones)

“…Compared to the previous reaction, this group attained the 6-CN derivative in a longer reaction time at RT. Kumari et al 166 afforded analogues of chromenopyranopyrimidinetriones 130 by reacting equimolar (2 mmol) diversified 1 with 11 and dimedone 129 using a Lewis acid catalyst, 5 mol % of scandium(III) triflate at 100 °C without use of any solvent (Scheme 90). The catalyst was recovered and reutilized without quantifiable loss of activity until four runs.…”

A novel approach towards synthesis of benzothiazoles and benzimidazoles: Eosin Y-catalyzed photo-triggered C–S and C–N bond formation

“…After that, the control reaction was executed between methylarene, 2-aminothiophenol, and Eosin Y under the optimized conditions; the reaction proceeded very well with a good yield of 90% (Scheme 3D). This indicated that Eosin Y and air decomposition as an oxidant resulted in hydrogen peroxide and 1 2 O 2 , wherein hydrogen peroxide acted as an oxidizing agent for oxidizing toluene to benzaldehyde. The reaction is induced by the oxidation of methyl arene derivatives that selectively produce aldehyde derivatives (Scheme 3E).…”

“…Green chemistry has become a contemporary research tool for designing proficient and environmentally compatible synthetic methods. 1 The main objective of green chemistry is to pursue alternative reaction techniques to avoid using conventional organic solvents and thermal conditions with minimum waste generation. 2…”

“…Green chemistry has become a contemporary research tool for designing proficient and environmentally compatible synthetic methods. 1 The main objective of green chemistry is to pursue alternative reaction techniques to avoid using conventional organic solvents and thermal conditions with minimum waste generation. 2 Currently, photocatalysts have been developed as simple and effective tools for activating organic molecules in visible light and have been used for many unique and valuable chemical processes.…”

Scandium(III)‐Triflate‐Catalyzed Multicomponent Reactions for the Synthesis of Nitrogen Heterocycles

“…Kumari et al. also used Sc(OTf) 3 as catalyst in the synthesis of highly functionalized pyrazoles 44 [95] and chromeno[2,3‐ d ]pyrimidetriones derivatives 45 [96] (Scheme 22).…”