Enolates of 2-Isothiocyanatocarboxylic Esters: Synthesis of Thiazolo[5,4-d]-thiazole Derivatives and 2-Thioxo-1,3-thiazolidine-4-carboxylates
作者:Dariusz Cież、Justyna Kalinowska-Tłuścik
DOI:10.1055/s-0031-1290825
日期:2012.6
acids leads to radical coupling followed by cyclization. This cascade reaction gives thiazolo[5,4-d]thiazole derivatives as pure enantiomers. Under similar conditions, 2-methylbutyl esters of 2-isothiocyanatocarboxylic acids undergo intermolecular oxidative dimerization to give mixtures of thiazolo[5,4-d]thiazoles and 2,3-diisothiocyanatosuccinates. Application of the soft enolization technique to
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