A series of eighteen 2-styrylchromone derivatives (see Chart 1) were synthesized and evaluated for their monoamineoxidase (MAO) A and B inhibitory activities. Many of the derivatives inhibited MAO-B comparable to pargyline (a positive control), and most of them inhibited MAO-B selectively. Of the eighteen derivatives, compound 9 having methoxy group at R1 and chlorine at R4 showed both the best MAO-B