Entry | Coumarin | Amine | Solvent | Temparature | Yield (%)c |
---|---|---|---|---|---|
1. | 2 | DIPAa | DCM | Reflux | No reaction |
2. | 2 | DIPA | THF | Reflux | No reaction |
3. | 2 | DIPA | ACN | Reflux | No reaction |
4. | 2 | DIPA | ACN | Sealed tubeb | 15 |
5. | 2 | DIPA | Methanol | 25-30°C | 15 |
6. | 2 | DIPA | Methanol | Reflux | 15 |
7. | 2 | DIPA | Ethanol | Reflux | 10 |
8. | 2 | DIPA | Toluene | Reflux | 30 |
9. | 2 | DIPA | Diisopropylether | 25-30°C | 53 |