This work describes an effective and a safe procedure for the preparation of commercially applicable trisubstituted ureas derived from their thio analogues which result from the thiuram disulfides in quantitative yields.
Symmetrical N,N'-disubstituted ureas have been synthesized and characterized. Among them, the branched dialkylureas prepared are highly soluble in organic media. Moreover, the solutions obtained are very viscous in heptane, if the branched alkyl groups are not too bulky (i.e. a methyl group on the alpha carbon, or an ethyl group on the beta carbon). Due to the strong, bifurcated hydrogen bonds between
The Application of<i>N</i>-Substituted Trichloroacetamides as<i>in situ</i>Isocyanate Generating Reagents for the Synthesis of Acylureas and Sulfonylureas
作者:Ivanka A. Atanassova、Jan S. Petrov、Nikola M. Mollov
DOI:10.1055/s-1987-28067
日期:——
In dimethylsulfoxide solution in the presence of excess of powdered sodium hydroxide, N-subsituted trichloroacetamides 1 are used as in situ isocyanate generating reagents which can react with carboxamides or sulfonamides 2 to afford acylureas or sulfonylureas 3.