Scheme 2.
Synthesis of tosyl oxime derivatives; i: NaOH, EtOH, rt, 1 d (65–98%). ii: NaOAc, EtOH, reflux, 3 h (54–75%). iii: NH2OH⋅HCl, NaOH, EtOH, reflux, 6 h (81–98%). iv: TsCl, dry CH2Cl2, Et3N, reflux, 3 h (80–93%).
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