Scheme 3.
Reagents: i. mCPBA, CH2Cl2 11 : 12 (9 : 1) 77%, 15 82%; ii. Ac2O, Py then mCPBA, CH2Cl2 (13 only) 65%; iii. mCPBA, MeCN, NaHCO3 11 : 12 (1 : 2) 95%; iv. Ac2O, pyridine; v. H2, Pd/C, 14 88% from 12, 15 84% from 11, 16 97%.
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