The first examples of cycloadditions of 2-diazo-1,3-dicarbonyl compounds to aromatic thioketones
作者:Valerij A. Nikolaev、Alexey V. Ivanov、Anton A. Shakhmin、Joachim Sieler、Ludmila L. Rodina
DOI:10.1016/j.tetlet.2012.04.036
日期:2012.6
Acyclic 2-diazo-1,3-dicarbonyl compounds react at 20–50 °С with aromatic thioketones and through a cascade process, involving the cycloaddition of a diazo group dipole with the CS bond, elimination of nitrogen from the arising thiadiazoline, and subsequent [1,5]-electrocyclization of the intermediate СS-ylide, the relevant oxathioles being formed in yields of up to 70%. Carbocyclic 2-diazo-1,3-diketones
无环2-重氮-1,3-二羰基化合物在20–50°С下与芳族硫酮反应,并通过级联过程进行反应,其中包括将带有CS键的重氮基偶极环加成,从生成的噻二唑啉中消除氮,随后中间体СS-内酯的[1,5]-电环化,生成的相关草硫醇的收率高达70%。在室温下,碳环2-重氮-1,3-二酮与硫酮的反应要慢得多,但是随着温度的升高,它们会通过沃尔夫夫重排反应部分分解,生成2-氧杂环丁烯,从而生成[4 + 2]-环加成产物,是氧杂环丁酮和/或氧杂环丁烯二聚体。