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Reagents and conditions: a) K2CO3, NaI/acetone, reflux, 22 h; b) N2H4/ethanol, reflux, 4 h; c) indole-2-carboxylic acid for 22a, benzofuran-2-carboxylic acid for 22b, CDI/THF, 0 °C to RT, overnight; d) 2M HCl in diethyl ether, MeOH, reflux, 3 h; e) 16, EDC/DCM, Na2CO3, RT, 24 h
