Scheme 3.
Synthesis of isomeric intermediates 39 and 40. Reagents and conditions: (a) (MeO)2SO2, K2CO3, acetone, rt, overnight; (b) HCO2NH4, Pd/C, EtOH/H2O, 50 °C, 2–3 h; (c) HCO2NH4, Pd/C, EtOH/H2O, 50 °C, 2–3 h.
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