Cyanoacetylazoles and salicylic aldehydes promoting the synthesis of new trifluoromethyl-substituted azolecarbonyl-2H-chromen-2-ones through the Knoevenagel condensation reaction

Triazine‐Based Porous Organic Polymer with Good CO2 Gas Adsorption Properties and an Efficient Organocatalyst for the One‐Pot Multicomponent Condensation Reaction

“…Owing to a wide spectrum of usefulness in various pharmacological and biological processes, such as mutagenicity, antitumor, anticancer, laboratory analysis of many antimicrobial agents, etc., chromene derivatives have been intensively studied. There are several reports of the synthesis of 2‐amino‐4 H ‐cromenes in the presence of some homogeneous inorganic bases such as K 2 CO 3 , NaOH, acids like TiCl 4 as well as a few hazardous organic bases such as 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU), 1,4‐diazabicyclo[2.2.2]octane (DABCO), piperidine, and pyridine . Owing to the homogeneous nature of the bases, product separation from the reaction mixture is very difficult and challenging although large product yields are observed over these catalysts.…”

A Regioselective Metal-Free Construction of 3-Aroyl Coumarins by Csp2-H Functionalization

“…Brown solid (18 mg, 70%), mp 148–150 °C (ref , 162–163 °C). 1 H NMR (300 MHz, CDCl 3 ): δ 7.95 (s, 1H), 7.56–7.65 (m, 2H), 7.28–7.41 (m, 2H), 6.98 (s, 1H), 6.83 (d, J = 2.1 Hz, 1H), 6.19 (d, J = 2.1 Hz, 1H), 4.1 (s, 3H).…”

Synthesis and X‐ray Characterization of 4,5‐Dihydropyrazolyl‐Thiazoles Bearing a Coumarin Moiety: On the Importance of Antiparallel π‐Stacking

“…[33] Similar properties have been also described for substituted pyrazolyl thiazolyl coumarin dyes. [34][35][36] In continuance of our previous work emphasizing the significance of antiparallel displaced π-stacking [37,38] and tetrel bonding [39,40] in crystal engineering, [41] in this manuscript we report the synthesis, spectroscopic and solid state characterization of two new pyrazolyl-thiazole-coumarin hybrids that present an extended π-surface due to the planarity of the pyrazolyl-thiazole-coumarin system that mostly dictate their Xray packing (see Scheme 1). Several π-stacking modes and halogen bonding interactions have been also studied using DFT calculations and characterized by a combination of computational tools, such us molecular electrostatic potential (MEP) surfaces, the quantum theory of atoms-in-molecules and the noncovalent interaction plot (NCIPlot).…”

“…Coumarin‐thiazoles dyes are exploited as optical brighteners, [28,29] fluorescence labels, [30,31] non‐linear optical materials, [32] solar energy absorbers, laser dyes and as two‐photon absorption (TPA) materials [33] . Similar properties have been also described for substituted pyrazolyl thiazolyl coumarin dyes [34–36] …”