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Synthetic pathway of α-ketothioamide derivatives 1–21, 38, and 39 a. a Reagents and conditions: (i) Br2, CHCl3, TBAB, r.t., for 2 h; (ii) S8, appropriated amino group, DMF, r.t., 8%–73%. R represents aryl or alkyl moieties and R’ and R’’ represent different amino group as detailed in § 2.3 SAR’s Investigation.
