Scheme 1.
Oleanolic acid transformations. Reagents and condition: (a) (CH3)2SO4, NaOH, EtOH, and reflux; (b) Jones reagent, acetone, and RT; (c) NH2OHxHCl, CH3COONa, EtOH, and reflux; (d) succinyl anhydride, pyridine, DMAP, and reflux.
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