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(a) tert-Butyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate, K2CO3, PdCl2(dppf)·DCM, 1,4-dioxane, H2O, 110 °C; (b) HCl, DCM, rt; (c) 10% Pd/C, ammonium formate, MeOH, 60 °C; (d) phenylboronic acid, K2CO3, PdCl2(dppf)·DCM, 1,4-dioxane, H2O, 110 °C.
