Scheme 2.
Synthetic route to 35: (i) ethanol, rt, 4 h, then NH2OH·HCl, TEA, rt, 2 h; (ii) HCl, zinc powder, 60 °C, 2 h; (iii) DMFDMA, 100 °C, 2 h; (iv) acetic acid, ethanol, 100 °C, 16 h.
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