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Synthesis of compound 7–12. (a) K2CO3, KI, acetone, 60°C, 48 h, η = 65–71%; (b) 4-(dimethylamino)benzaldehyde, ethanol/water, NaOH, RT, over night, η = 85–91%; (c) 4-(dimethylamino)cinnamic aldehyde, ethanol/water, NaOH, RT, over night, η = 93–95%.
