A serial of syringic acid derivatives were synthesized by the reaction of regioselective demethylation of trimethoxybenzene compounds at rt,using hydrogen bromide as catalyst and Ac OH as solvent.The structures were confirmed by ~1H NMR and MS(ESI).The synthesis reaction conditions were optimized,using 2a as example.The results indicated that under the optimum conditions(1 1 mmol,33% HBr 0.35 m L,AcOH 0.5 mL,reaction at rt for 24 h),the yields of 2 were 58%~85%,respectively.The amplification scale experimen...
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