Odorless 2-(1,3-dithian-2-ylidene)-3-oxobutanoic acid (1c) was prepared and investigated in the thioacetalization of carbonyl compounds as a 1,3-propanedithiol equivalent. The results showed that the thioacetalization of various carbonyl compounds 2 with 1c proceeded smoothly and afforded the corresponding dithioacetals 3 in high yields (up to 99%) in the presence of acetyl chloride at room or reflux temperatures. Moreover, the thioacetalization exhibited high chemoselectivity between aldehydes and ketones. Key words: chemoselectivity, 2-(1,3-dithian-2-ylidene)-3-oxobutanoic acid, α-oxo ketene dithioacetal, 1,3-propanedithiol equivalent, thioacetalization.
无味的2-(1,3-二硫杂环戊烷-2-亚基)-3-氧代丁酸(1c)被制备并研究其在羰基化合物的硫缩醛化反应中作为1,3-丙二硫醇当量的应用。结果显示,在室温或回流温度下,存在乙酰氯的情况下,各种羰基化合物2与1c的硫缩醛化反应进行得很顺利,并以高收率(高达99%)得到了相应的二硫代缩醛3。此外,硫缩醛化在醛和酮之间表现出高化学选择性。关键词:化学选择性,2-(1,3-二硫杂环戊烷-2-亚基)-3-氧代丁酸,α-氧代酮烯二硫代缩醛,1,3-丙二硫醇当量,硫缩醛化。