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Synthetic pathway for preparation of compounds 10a–10d and 13a–13f; reagents and reaction conditions: (i) EtOH, reflux, 4 h; (ii) SO2Cl2, dry Et2O, 0–5 °C, 2 h; (iii) (a) NaNO2-HCl, 0–5 °C, 2 h; (b) NaOAc.3H2O, EtOH, 0–5 °C, 4 h; (iv) EtOH, reflux, 4 h.
