Scheme 1. Synthesis of 5-(2-Phenylethyl)-3-pyridinecarboxylic acid (2f)a.
aReagents and conditions: (a) phenylacetylene, Pd(OAc)2, CuI, DIPEA, triphenylphosphine, acetonitrile, reflux 16 h, stirring under N2, 82%; (b) H2, Pd on C, EtOAc/methanol 10 h, 82%; (c) NaOH, CH3OH, 18 h ii) HCl, 71%.
