Figure 3.
Reagents and conditions: a) 57 (5 mol %), mCPBA (1.5 equiv), TFE/CH2Cl2, RT; b) 58 (0.75 equiv), TFE/CH2Cl2, RT. mCPBA=meta‐chloroperbenzoic acid, TFE=2,2,2‐trifluoroethanol.
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