Less reactive dipoles of diazodicarbonyl compounds in reaction with cycloaliphatic thioketones – First evidence for the 1,3-oxathiole–thiocarbonyl ylide interconversion
作者:Valerij A Nikolaev、Alexey V Ivanov、Ludmila L Rodina、Grzegorz Mlostoń
DOI:10.3762/bjoc.9.309
日期:——
compound was diazoacetylacetone. In the case of dimethyl diazomalonate competitive 1,3-electrocyclization yielded the corresponding thiirane at elevated temperature, which after spontaneous desulfurization produced a tetrasubstituted alkene. To explain the observed temperature dependence of the main reaction product type obtained from dimethyl diazomalonate and 2,2,4,4-tetramethyl-3-thioxocyclobutansmall
无环重氮二羰基化合物在室温下与脂环族硫酮反应,例如 2,2,4,4-四甲基-3-硫氧环丁烷小分子,即西里尔-1-酮和金刚烷硫酮,通过级联过程,其中关键步骤是 1,5-中间体硫代羰基叶立德的电环化导致四取代的螺环 1,3-oxathioles。最具反应性的重氮二羰基化合物是重氮乙酰丙酮。在重氮丙二酸二甲酯的情况下,竞争性 1,3-电环化在高温下产生相应的硫杂丙环,其在自发脱硫后产生四取代烯烃。为了解释观察到的从重氮丙二酸二甲酯和 2,2,4,4-四甲基-3-硫代环丁烷中获得的主要反应产物类型的温度依赖性,即,