Table 3. Comparison of the Current Method with the Previous Literature for the Synthesis of Benzoxazole.
entry | catalyst | conditions | yield (%) | recycling runa |
---|---|---|---|---|
1 | samarium(III) triflate (10 mol %), EtOH–H2O (4:2 mL) | 50 °C, 2 h | 9240 | 4th (6%) |
2 | poly(melamine-formaldehyde) (10.0 mg), xylene (0.5 mL) | 110 °C, 10 h | 9141 | 6th (5%) |
3 | NiFe2–xEuxO4 (6 mol %), water (5 mL) | reflux, 50 min | 8636 | 6th (9%) |
4 | TiO2@ZrO2 (10 mol %), acetonitrile | 60 °C, 15 min | 9137 | 4th (17%) |
5 | Hf-MOF (1 mol %) | 140 °C, 6 h | 9542 | 5th (5%) |
6 | our work: BAIL gel (1 mol %), solvent free | 130 °C, 5 h | 98 | 5th (3%) |
The number in parenthesis is the drop in the reaction yield after the last run.