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