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 fromisoselenocyanates, 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