Table 3.
Optimization of the reaction conditions of the oxidation reaction.
 | ||||
| entry | catalyst | solvent | ratio of 11a/DDQ | yield (%)a |
| 1 | – | CH2Cl2 | 1:4 | 41 |
| 2 | – | toluene | 1:4 | 71 |
| 3 | – | toluene | 1:2 | 43 |
| 4 | silica gelb | toluene | 1:4 | 68 |
aIsolated yield. b10% Amount of 11a.
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