Jizhen Li, Zhenfa Zhang, E. Fan
Feb 2, 2004
Citations
0
Influential Citations
16
Citations
Journal
Tetrahedron Letters
Abstract
The solid-phase synthesis of 1,5-substituted 2-(N-alkylamino)-imidazolidin-4-one from resin-bound amino acid is described. Using a guanidinylating reagent in solution to form the guanidine moiety instead of resin-bound carbodiimide, an N-alkyl substitution is introduced specifically onto the 2-amino position. Combined with an alkylation step of the resin-bound amino acid prior to guanidinylation, all desired substitutions of the final products are achieved without racemization at chiral centers. This reaction sequence is also compatible with a variety of protected amino acid side chains.