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To a mixed solution of methylene chloride / N, N-dimethylacetamide 20/1 (63 ml) at room temperature was added SOCl 2 (2.76 g, 0.02 mol) 2-methylpropanoic acid (3.18 g, 0.01 mol) was added to the mixture, and the mixture was stirred at room temperature for 2 hours. " (E) -4- (3,5-dimethoxystyryl) phenol (5.12 g, 0.02 mol) was added and the reaction was warmed to 60-65 & lt; The mixture was stirred overnight on the road. The reaction mixture was cooled to 0 & lt; 0 & gt; C and slowly added 100 ml of purified water. Get The crude mixture was stirred at room temperature for 0.5 h. Extract with 100 ml of ethyl acetate and wash 3 times with 150 ml of brine Followed by distillation under reduced pressure. Purification by column chromatography (30% ethyl acetate in hexanes) gave 65% yield as a white Obtained a color solid.