Scheme 5.
Syntheses of (±)-24. Reagents and conditions: (a) Hydroxylamine hydrochloride, NaHCO3, methanol, reflux; (b) 9a, TBTU, HOBt, DIPEA, DMF, RT–120 °C; (c) 4-methylmorpholine N-oxide, OsO4, THF, H2O, RT.
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