A process for preparing a 2-hydroxymethyl-2,3-dihydro-thieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid diester comprising the reaction of the alkali salt of 3,4-dihydroxythiophene-2,5-dicarboxylic acid diester and epihalohydrin in a molar ratio in the range of 1.01 to 1.4 in a polar solvent or mixture of polar solvents at a temperature between −20° C. to the boiling point of the polar solvent or polar solvent mixture.
一种制备2-羟甲基-
2,3-二氢噻吩[3,4-b][1,4]
二噁烷-5,7-二
羧酸二酯的方法,包括在极性溶剂或极性溶剂混合物中将3,4-二羟基
噻吩-2,5-二
羧酸二酯的碱盐与环氧卤代
丙烷在摩尔比在1.01至1.4的范围内反应,在温度范围为-20°C至极性溶剂或极性溶剂混合物的沸点之间。