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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

A general method for the solid-phase synthesis of unsymmetrical tri- and tetrasubstituted ureas.

A general method for the preparation of unsymmetrical di, tri-, and tetrasubstituted ureas on polymer supports is presented. Polymer-bound primary and secondary amines react with imidazolium salts (urea donors), which are generated from the reaction of N,N'-carbonyldiimidazole (CDI) with primary and secondary amines followed by alkylation with MeI to give tri- and tetrasubstituted ureas in excellent yields (76-98%) and purities (80-99%).[1]

References

  1. A general method for the solid-phase synthesis of unsymmetrical tri- and tetrasubstituted ureas. Zheng, C., Combs, A.P. Journal of combinatorial chemistry. (2002) [Pubmed]
 
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