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Synthetic route to compounds 6, 8–26: (i) formamide, 150 °C, 16 h; (ii) NaH, NMP, 0 °C, 30 min, then chloroacetone, 0 °C, 1 h; (iii) bromine, acetic acid, 65 °C, 16 h; (iv) thioamide or thiourea, ethanol, 80 °C, 16 h; for complete structure of the compounds, see Fig. 3.
