Selenium-containing heterocycles from isoselenocyanates: synthesis of 2-methylidene-1,3-selenazolidine derivatives
作者:Geoffroy L. Sommen、Anthony Linden、Heinz Heimgartner
DOI:10.1016/j.tet.2006.01.077
日期:2006.4
A convenient and unequivocal synthesis of the title compounds from isoselenocyanates, malononitrile or 2-cyanoacetate, and 1,2-dibromoethane or α-halogenated carboxylic acid derivatives is reported. The proposed reaction mechanism involves in situ cyclization of different halogenated compounds with an intermediate keten-N,Se-acetal, generated by the base promoted nucleophilic addition of the acidic
据报道,由异戊烯异氰酸酯,丙二腈或2-氰基乙酸酯和1,2-二溴乙烷或α-卤代羧酸衍生物方便而明确地合成标题化合物。拟议的反应机理涉及将不同的卤化化合物与中间体酮基-N,Se-缩醛进行原位环化,该中间体是通过将酸性氰基亚甲基碱促亲核加成到脂肪族和芳香族异硒代氰酸酯中而生成的。提供了有关新化合物结构的化学和光谱证据。