摘要 衍生自2-异硫代羧酸薄荷酯的烯醇钛(IV)的氧化二聚作用导致自由基偶联,然后环化。该级联反应得到作为纯对映异构体的噻唑并[5,4- d ]噻唑衍生物。在相似的条件下,2-异硫氰酸根合羧酸的2-甲基丁酯进行分子间氧化二聚生成噻唑并[5,4- d]thiazoles and 2,3-diisothiocyanatosuccinates. Application of the soft enolization technique to dimethyl α,α′-diisothiocyanatodicarboxylic esters gives novel cyclic 1,2-diisothiocyanato-1,2-dicarboxylates. Sodium enolates of 2-isothiocyanatocarboxylates, on the other hand, form
摘要 衍生自2-异硫代羧酸薄荷酯的烯醇钛(IV)的氧化二聚作用导致自由基偶联,然后环化。该级联反应得到作为纯对映异构体的噻唑并[5,4- d ]噻唑衍生物。在相似的条件下,2-异硫氰酸根合羧酸的2-甲基丁酯进行分子间氧化二聚生成噻唑并[5,4- d]thiazoles and 2,3-diisothiocyanatosuccinates. Application of the soft enolization technique to dimethyl α,α′-diisothiocyanatodicarboxylic esters gives novel cyclic 1,2-diisothiocyanato-1,2-dicarboxylates. Sodium enolates of 2-isothiocyanatocarboxylates, on the other hand, form
The article deals with a newsynthesis of 2-thioxo-1,3-imidazolidine derivatives, masked 2,3-diaminosuccinic acids. The described procedure leads to the designed products by an intermolecular Mannich reaction between aldimine (ethyl iminoacetate) and enolates derived from 2-isothiocyanatocarboxylic esters. The prepared heterocyclic products having twostereogeniccenters can be easily separated into