A general and versatile method for the preparation of a variety of β-hydroxybenzothiazoles (aldol-type adducts) by the reaction of α-lithio-2-methylbenzothiazole with carbonyl compounds was proposed. As an example of the use of α-lithio-2-methylbenzothiazole as a masked enolate, the product obtained by the reaction of this lithium reagent with 5-chloro-2-pentanone could be effectively transformed into the corresponding β-oxyaldehyde [2-methyl-2-(2-oxoethyl)-tetrahydrofuran].
通过δ±-
硫代-
2-甲基苯并噻唑与羰基化合物的反应,提出了一种制备各种δ-²-羟基
苯并噻唑(醛醇型加合物)的通用方法。作为使用δ-
硫代-
2-甲基苯并噻唑作为掩蔽式
烯醇的一个例子,这种
锂试剂与
5-氯-2-戊酮反
应得到的产物可以有效地转化为相应的δ-
氧醛[
2-甲基-2-(2-
氧代乙基)-
四氢呋喃]。