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Synthetic route to 32–34: (i) formamide, 150 °C, 16 h; (i) NaH, NMP, 0 °C, 30 min, then chloroacetone, 0 °C, 1 h; (iii) NCS, sulfuric acid, DCM, 40 °C, 6 h; (iv) thioamide, acetic acid, ethanol, 80 °C, 16 h; for complete structure of the compounds, see Fig. 3.
