Scheme 1.
Reagents and conditions: (A) isatoic anhydride, triethylamine, toluene, reflux, 1–2 h, 35–60%; (B) K3PO4, tert-butyl hydroperoxide (TBHP), dimethyl sulfoxide (DMSO), r.t., 20 h, 20–95%; (C) pyridine, NH2OH·HCl, reflux, 4 h, 85–95%.
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