A. Nefzi et al., SOLID-PHASE SYNTHESIS OF HETEROCYCLIC-COMPOUNDS FROM LINEAR PEPTIDES - CYCLIC UREAS AND THIOUREAS, Tetrahedron letters, 38(6), 1997, pp. 931-934
The solid phase synthesis of cyclic ureas and thioureas is described.
The reduction of acylated dipeptides followed by treatment with carbon
yldiimidazole or thiocarbonyldiimidazole affords the corresponding cyc
lic urea or thiourea in good yield and high purity. This is an example
of a broader approach to the solid phase synthesis of individual hete
rocyclic compounds and combinatorial libraries using peptides as start
ing materials. (C) 1997, Elsevier Science Ltd.