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| Entry | Compd | Reacting system | Solvent | Temp [°C] | t [h] | Yield [%] |
| 1 | 7 | MCPBA | DCM | Δ | 16 | 9: 47 |
| 2 | 7 | Oxone/NaHCO3/aq. Na2EDTA | CF3COCH3/ACN | rt | 18 | 11: 51 |
| 3 | 7 | H2O2/NH4HCO3 | ACN/H2O | rt | 16 | 11: 59 |
| 4 | 8 | MCPBA | DCM | Δ | 16 | 10: 40 |
| 5 | 8 | Oxone/NaHCO3/aq. Na2EDTA | CF3COCH3/ACN | rt | 18 | 12: 55 |
| 6 | 8 | H2O2/NH4HCO3 | ACN/H2O | rt | 18 | — |
Bu3SnH, AIBN, THF, reflux, 30′, 93–98%.
