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Research on synthetic technology of 3,4,5-trimethoxybenzaldehyde from vanillin

QU Xiao-shu,WANG Ya-hong,ZHU Bo(Dept.of Pharmacy and Applied Chemistry,Jilin Institute of Chemical Technology,Jilin City 132022,China)  
3,4,5-trimethoxybenzaldehyde is synthesized in 71% yield by vanillin method.5-bromovanillin is afforded in 96% yield by the bromination of vanillin with bromine as brominating agents.Treatment of 5-bromovanillin in DMF with sodium methoxide in the presence of cuprous chloride as catalyst gives syringaldehyde in 90% yield,from which 3,4,5-trimethoxybenzaldehyde is obtained by methylation with dimethylcarbonate in 82% yield.
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