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Optimization of the reaction conditions for 3-(bromomethyl)coumarins from MBH adducts.
 | ||||
| entry | equiv of AzPS | equiv of HBr | solvent | yield 4a (%) |
| 1 | 2 | – | CH3CN | – |
| 2 | 2 | 1 | CH3CN | 33 |
| 3 | 2 | 2 | CH3CN | 78 |
| 4 | 2 | 3 | CH3CN | 62 |
| 5 | 2 | 4 | CH3CN | 31 |
| 6 | 3 | 2 | CH3CN | 65 |
| 7 | 4 | 2 | CH3CN | 57 |
