A one-pot, three-component synthesis of new pyrano[2,3-h]coumarin derivatives

Prospecting for cytotoxic and antiprotozoal 4‐aryl‐4H‐chromenes and 10‐aryldihydropyrano[2,3‐f]chromenes

“…Since the cyclization step might occur via a Michael addition mechanism, the strong electron delocalization in 15 presumably reduced its reactivity in the presence of phloroglucinol. The reaction procedure herein used for the preparation of compounds 4 – 15 obtained with moderate to high yield was previously reported in the literature …”

A Novel One‐pot Protocol for Silica Sodium Carbonate‐Catalyzed Synthesis of Pyrano[2,3‐h]coumarins

“…The reaction worked efficiently in refluxing MeOH, which afforded the corresponding product 4a in 60% yield ( [15][16][17]. The model reaction without the addition of any catalyst resulted in no product (Table 1, entries [18][19][20]. So the best results were obtained by carrying out the reaction in the presence of 5 mol% of SSC in refluxing MeOH.…”

New Conditions for the Effective Synthesis of Tri and Tetrasubstituted Imidazoles Catalysed by Recyclable Indium (III) Triflate and Magnesium Sulfate Heptahydrate

“…In the presence of catalytic amounts of In(OTf) 3 , the mixture of benzil (1 mmol), benzaldehyde (1 mmol), ammonium acetate (1 mmol), benzylamine (1 mmol) were reacted in different solvents such as water, ethanol, methanol, chloroform, acetonitrile and solvent-free conditions. From these experiments, it was clearly demonstrated that solvent-free is the best condition to accomplish this reaction ( Table 2).…”