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4-甲基水杨酸经硫酸二乙酯同时酯化和醚化得到的2-乙氧基-4-甲基苯甲酸乙酯,再经羧基化和选择性水解反应得到3-乙氧基-4-乙氧羰基苯乙酸,总收率58％。
4-methyl salicylic acid ethyl ester of 2-ethoxy-4-methylbenzoate obtained by simultaneous esterification and etherification of diethyl sulfate, followed by carboxylation and selective hydrolysis to give 3-ethoxy Ethoxycarbonylphenylacetic acid in 58% overall yield.