Table 3.
A comparison of the activity of magnetic ionogels with various reported procedure for the one-pot synthesis of benzopyran derivatives (4a).
| Method | Reaction conditions | Yield (%) | Reusability | Refs. |
|---|---|---|---|---|
| A | Neat, 100 °C; 1h; Basic conditions | 100 | 1 | 45 |
| B | HAHS’ ionic liquid, 0.75 h | 99 | 1 | 46 |
| C | Chitosan Based Heterogeneous Catalyses: ethanol: 3 h | 95 | 1 | 47 |
| D | Lithium perchlorate In acetonitrile at 20 °C ; 3 h; Electrolysis; | 92 | 1 | 48 |
| E | Triethylamine In water at 50 °C; Microwave irradiation; | 92 | 1 | 49 |
| F | Silica gel for 0.0333333 h; microwave irradiation; | 91 | 1 | 50 |
| G | Amine In N,N-dimethyl-formamide at 120 °C ; microwave irradiation; | 79 | 1 | 51 |
| H | Meglumine In ethanol; water at 20 °C; for 0.0833333 h; | 97 | 1 | 57 |
| I | Zinc(II) oxide In ethanol; water at 20 °C ; 3 h; | 95 | 3 | 52 |
| J | Ferrocene-Functionalized Dithiocarbamate Zinc In ethanol at 20 °C ; for 2 h; | 95 | 1 | 53 |
| K | Magnetically tuned halloysite functionalized sulfonic acid In ethanol; water at 80 °C ; for 1.5 h; | 95 | 5 | 54 |
| L | Pyridine N-oxide; silver(l) oxide In ethanol at 70 °C; for 1.33333 h; | 1 | 55 | |
| M | Cobalt ferrite In ethanol; water for 0.116667 h; | 93 | 5 | 56 |
| N | Magnetic ionogel, water at 60 °C; for 1.5 h | 97 | 5 | This work |