Scheme 1.
Reagents and conditions: (a) CrO3/H2SO4, acetone 0 °C, overnight; (b) ethyl formate, NaH, dioxane, 40 °C, 1 h then 100 °C, 4 h; (c) Ar-NHNH2 hydrochloride, AcOH, reflux, 2 h; (d) Ar-NHNH2 hydrochloride, EtOH, 70 °C, 1 h.
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