Table 4 Comparison of present method with other reported protocols for the synthesis of highly substituted pyran derivatives.
Product | Reaction conditions | Time (min) | Yield a (%) |
|---|---|---|---|
4a | Urea/EtOH: H2O (1:1, v: v)/rt85 | 120 | 90 |
Fe3O4@SiO2@TiO2/Solvent-free/100 °C86 | 20 | 93 | |
Magnetic La0.7Sr0.3MnO3 nanoparticles/EtOH/Us/rt87 | 12 | 92 | |
Fe3O4@SiO2@NH-NH2-PW/H2O/Reflux88 | 40 | 90 | |
NH4H2PO4/Al2O3/EtOH/Reflux78 | 15 | 86 | |
Tetra-methyl ammonium hydroxide/H2O/rt89 | 120 | 81 | |
Fe3O4@SiO2–imid–PMA/H2O/Us/rt79 | 7 | 96 | |
Fe3O4@Hydrol-PMMAn/solvent free (pesent work) | 5 | 96 | |
4e | NiFe2O4@SiO2@H14[NaP5W30O110]/EtOH/Us/rt84 | 5 | 94 |
Nano Na2CaP2O7/H2O/Reflux90 | 10 | 94 | |
Magnetic La0.7Sr0.3MnO3 nanoparticles/EtOH/Us/rt87 | 8 | 98 | |
NH4H2PO4/Al2O3/EtOH/Reflux78 | 15 | 90 | |
Potassium phosphate/EtOH: H2O (80:20, v: v)/rt82 | 45 | 89 | |
Tetra-methyl ammonium hydroxide/H2O/rt89 | 120 | 92 | |
Fe3O4@SiO2–imid–PMA/H2O/Us/rt79 | 7 | 95 | |
Fe3O4@Hydrol-PMMAn/solvent free present work) | 4 | 96 | |
4 L | NH4H2PO4/Al2O3/EtOH/Reflux78 | 25 | 84 |
NiFe2O4@SiO2–H3PW12O40/EtOH/Reflux80 | 25 | 82 | |
Potassium phosphate/EtOH: H2O (80:20)/rt82 | 60 | 89 | |
Fe3O4@Hydrol-PMMAn/solvent free (present work) | 5 | 88 |
