ZnS nanoparticles immobilized on graphitic carbon nitride as a recyclable and environmentally friendly catalyst for synthesis of 3-cinnamoyl coumarins

Coumarin‐Chalcones Generated from 3‐Acetylcoumarin as a Promising Agent: Synthesis and Pharmacological Properties

“…Moreover, other catalysts such as bismuth triflate [Bi-(OTf) 3 ], [74] Amberlyst 26 A [75] and zinc oxide nanoparticles incorporated on a graphitic carbon nitride nanocomposite (ZnS NPs/g-C 3 N 4 ), [76] are used to produce various chalcones. A proposed mechanism [76] for the reaction is presented in Scheme 2.…”

“…When thiazolylpyrazolyl coumarin ( 70) is refluxed with chloroacetone (71), or phenacyl bromide (73); ethyl-2-chloroacetoacetate (75) and ethylbromoacetate (77), or ethyl 2-bromopropionate (79) in ethanol, with a catalytic amount of anhydrous sodium acetate, produces the 4-methyl/phenylthiazolyl pyrazoline derivatives ( 72) and ( 74), ethyl-2-pyrazolyl-4-methylthiazole-5-carboxylate (76) and pyrazolyl thiazolidinones (78) and ( 80) in good yields. The target compound ( 82) is made by combining thiocarbamoyl pyrazolines (70) and the suitable hydrazonoyl chlorides (81) with triethylamine in a one-pot Scheme 14.…”

Recent Progress of Photocatalytic Fenton-Like Process for Environmental Remediation

“…Overall, iron leaching issue has posed serious problem in acidic aquatic environment. Additionally, g-C 3 N 4 nanomaterials have emerged as a promising visiblelight-response photocatalyst in organic removal and water splitting (Dong H. et al, 2018;Safaei-Ghomi et al, 2019). In 2012, Cui et al (2012) firstly reported that visible light excited of g-C 3 N 4 catalyzed H 2 O 2 to produce •OH radicals.…”

Background on the control of the cattle tick R. (B.) microplus and the use of coumarin substances as an alternative

“…183,184 These methodologies laid the foundation for the development of processes that obtain coumarin compounds. 171 These new methodologies are based on the use of different reactions and catalytic processes in which the precursors and materials used to obtain coumarins vary, involving ecological approaches, new technologies, such as microwaves 184 and ultrasound, 185 new catalysts, 186,187 ecological solvents, 188 reactions without Solvents 189 and molecular coupling, 190,191 among others, resulting in coumarins with greater yields and better activity, demonstrating the importance of coumarin compounds in different industries and providing coumarin derivatives in recent years that are much more easily obtained, economical and environmentally responsible.…”