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Scope studies. Enantiomeric excess determined by chiral HPLC or GC. Conditions: 0.2 mmol scale, 11 equiv. py•9HF, 1.2 equiv. m-CPBA, 0.08 M, 48 h, isolated yields. Absolute configuration of 1i established through X-ray crystal structure determination of a derivative (S4), remaining products assigned by analogy.
