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| ||||
|---|---|---|---|---|
| Entry | Solvent | Yielda (%) | ||
| 3 | 4 | Rec. 1 | ||
| 1 | CH2Cl2 | 18 | 73 | 8 |
| 2 | –(Ball milling) | 48 | 12 | 36 |
| 3 | AcOEt | 4 | 80 | 15 |
| 4 | Acetone | 81 | 16 | — |
Yields were determined by 1H NMR analysis in DMSO-d6 using pyridine as an internal standard.
