Synthesis and Structure of Thia and Selena Heterocycles Containing Cycloamidine Substructures
作者:Rainer Beckert、Jan Fleischhauer、Wolfgang Günther、Stefan Kluge、Stefan Zahn、Jennie Weston、Dorothea Berg、Helmar Görls
DOI:10.1055/s-2007-983834
日期:2007.9
Cyclization of a bis-arylimidoyl chloride with an acylselenourea leads to the construction of a 1,3-selenazolidine with a heteroradialene structure. Another reaction of the bis-arylimidoyl chloride (hydrazinolysis) leads to the formation of Î2-1,2-diazetines, which we have shown previously to be reactive precursors for ring transformation reactions that yield unusual heterocycles. We now demonstrate that the reaction of these Î2-1,2-diazetines with various isothio- or isoselenocyanates affords an efficient entry to highly substituted 1,3,4-thia- or -selenadiazines. The structures of these novel derivatives were confirmed by NMR and mass spectroscopy, elemental analysis, and X-ray structural analysis. Detailed multidimensional 77Se NMR experiments as well as density functional theory (DFT) calculations show structural specifics of these compounds.
双芳基咪唑氯化物与酰基硒脲的环化反应导致了具有异构二烯结构的1,3-硒杂唑烷的构建。双芳基咪唑氯化物的另一反应(肼水解)导致了Δ2-1,2-二氮烯的形成,我们之前已表明其是环转化反应的反应性前体,能够生成不寻常的杂环。我们现在证明这些Δ2-1,2-二氮烯与各种异硫氰酸酯或异硒氰酸酯的反应为高度取代的1,3,4-硫或硒二氮烯的合成提供了高效途径。这些新颖衍生物的结构通过NMR质谱、元素分析和X射线结构分析得到了确认。详尽的多维77Se NMR实验以及密度泛函理论(DFT)计算展示了这些化合物的结构特征。