Scheme 3.
Synthesis of compounds 12 and 13. Reagents and conditions: (a) HNO3, CH3COOH, 50 °C; (b) Sn, SnCl2·H2O, HCl, EtOH; (c) 4-chlorobenzenesulfonyl chloride, Py; (d) LiOH, MeOH, H2O, 30 °C.
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