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Synthesis of 12: (a) (4‐(Ethoxycarbonyl)phenyl)boronic acid (22), Cu(OAc)2, pyridine, DMF, 90 °C, 12 h, 66 %; (b) LiOH, THF, EtOH, H2O, 50 °C, 12 h, 95 %; (c) ethyl 3‐aminobenzoate (25), EDC⋅HCl, 4‐DMAP, CHCl3, reflux, 6 h, 36 %; (d) LiOH, THF, EtOH, H2O, 50 °C, 12 h, 74 %.
