Catalytic synthesis of 6-aryl-1H-pyrazolo[3,4-d]pyrimidin-4[5H]-ones by heteropolyacid: H14[NaP5W30O110] and H3PW12O40

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

“…Therefore, . It was confirmed that heteropolyacid with Preyssler structure shows higher activity and yields due to the higher number of acidic protons [57].…”

Dehydration of Oximes to Nitriles Catalyzed by a Green Heteropolyacid Catalyst: Preyssler's Anion, [NaP5W30O110]14−

“…In our previous reports we used Preyssler heteropolyacid as a green and recyclable catalyst in oxidation of primary aromatic amines, 15 for the synthesis of 1,5-benzodiazepines, 16 in acetylation of alcohols and phenols, 17 for the synthesis of [ 19 for esterification of salicylic acid with aliphatic and benzylic alcohols. 20 We also reported that H 6 show that there is a relationship between the activity and structure of polyanion (Keggin or Preyssler).…”

Facile one-pot synthesis of chromeno[4,3-b]quinoline derivatives catalyzed by Cu(II)-Schiff base/SBA-15

“…In this paper, we report a greatly improved synthesis of compounds 5a-k in the presence of a catalyst Cu(II)-Schiff base/SBA-15 (structure in Figure 1). This work is part of our research efforts to improve conditions for the Hantzsch reaction [15][16][17][18][19], in particular by using silica gel-supported catalysts [20][21][22][23][24][25][26][27][28].…”