焦性没食子酸经碳酸二甲酯甲基化,再经Blanc氯甲基化反应制得2,3,4-三甲氧基氯苄,最后在氢氧化钠和溴化四丁铵催化下经高锰酸钾氧化得到2,3,4-三甲氧基苯甲酸,总收率约63%。
2,3,4-Trimethoxybenzoic acid was synthesized from pyrogaUic acid by methylation with dimethyl carbonate and Blanc chloromethylation to give trimethoxybenzyl chloride, followed by oxidation with KMnO4 in the presence of NaOH and tetrabutyl ammonium bromide with an overall 3/ield of about 63 %.