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Preparation of 2H-chromenes in glycerol[a]
 | ||||
|---|---|---|---|---|
| Entry | R | Reaction time [h][b] | Product | Yield [%][c] |
| 1 | H | 7 (20 mol %) | 32 | 94 |
| 2 | 4-MeO | 3 (40 mol %) | 33 | 84 |
| 3 | 5-NO2 | 3 (40 mol %) | 34 | 85 |
[a] Reagents and conditions: 1 (0.41 mmol), 1.2 equiv 3 c and 2 f in bidistilled glycerol (99.5 % w/v; 1 mL), open atmosphere, 90 °C. [b] Catalyst loading is given in parenthesis. [c] Isolated yield after column chromatography.
