2-(5-bromo-2-dimethylcarbamoylsulfanyl-benzoyl)-malonic acid dimethyl ester 在
甲醇 、
钠 作用下,
以
sodium methoxide methanol 为溶剂,
反应 22.0h,
以to provide 6-bromo-4-hydroxy-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester (1.9 g) as a sodium salt的产率得到6-bromo-4-hydroxy-2-oxo-2H-thiochromene-3-carboxylic acid methyl ester