Scheme 3.
Preparation of compounds 10–15 from LU 9: i. Ac2O/Py, rt; ii. PCC, 3 Å ms, dry DCM, rt; iii. NH2OH.HCl, 3 Å ms, dry Py; iv. OsO4 (cat.), NMO, Me2CO/H2O 6:1.
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