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Synthesis of cinnamate ester analogues. Reaction conditions: i) R3OH, Dowex 50WX8 H+ resin or conc. H2SO4, reflux; ii) PdCl2, PPh3, K2CO3, DMF, 100 °C; iii) ROH, toluene, reflux; iv) ArCHO (VII), pyridine, piperidine, 60°C; v) ZrO(NO3)2•xH2O, acetone, RT.
