<i>N</i>-<i>tert</i>-Butyl-<i>N</i>-(2,2-dichlorovinyl)carbamoyl Chloride: A Novel Building Block for the Synthesis of Nitrogen Heterocycles
作者:Mikhail S. Novikov、Alexander F. Khlebnikov、Alexander A. Stepanov、Rafael R. Kostikov
DOI:10.1055/s-1994-25572
日期:——
A synthesis of substituted 1,2,4-triazolidinones starting from N-tert-butyl-N-(2,2-dichlorovinyl)carbamoyl chloride (1) and hydrazine derivatives is reported. The reactions of 1 with ethylene-, phenylene- and propylenediamines followed by cyclizations yield the substituted cyclic ureas 6b-d, which may be used in the synthesis of bridged structures.