Scheme 1.
Synthesis route of compounds A1–A20, B1, B3–B16 and C1–C5. Reactants and reaction conditions: (a) thionyl chloride, DMF (cat.), anhydrous THF, 0 °C- r.t.; (b) substituted anilines, DMAP (cat.), anhydrous THF, and 0 °C- r.t.
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