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The general procedure for the synthesis of compounds 1–20. (i): K2CO3, acetone, Br(CH2)nBr, 60 °C; (ii): RH (amines), K2CO3, DMF/Acetonitrile, 100 °C, 3 h; (iii): 40% HBr, 120 °C, 3 h; (iv): piperidine, THF r.t. 10 h; (v): formononetin, K2CO3, acetone; (vi) K2CO3, 3-bromopropionic acid, acetone, 60 °C, 2 days; (vii) DMF, N, N-diisopropylethylamine, piperidine, 12 h, r.t.
