title: Peptide-heterocycle hybrid molecules: solid-phase synthesis of a 400-member library of N-terminal 2-iminohydantoin peptides.
abstract: A method for the heterocyclic modification of the N-terminus of a peptide is described. Reaction of the N-terminal amino group of solid-supported peptides with arylisothiocyanates generates a thiourea intermediate, as in the first step of Edman degradation. Treatment of the resin-supported peptide-thioureas with Mukaiyama's reagent (2-chloro-1-methylpyridinium iodide) generates an electrophilic carbodiimide functionality, which undergoes rapid intramolecular trapping by the adjacent amide group to give a 2-iminohydantoin ring at the N-terminus of the peptide. The dehydrothiolation step in the presence of Mukaiyama's reagent prevents Edman degradation from occurring, in essence leading to a "diversion" of the Edman degradation. Cleavage from the resin then releases the hybrid molecules incorporating a 2-iminohydantoin ring conjugated onto a peptidic fragment. A 400-member library of the iminohydantoin-peptide hybrids was synthesized using this approach, starting from a chlorotrityl resin-supported tripeptides.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
authors.forename: Julia I
authors.initials: JI
authors.lastname: Gavrilyuk
authors.forename: Ghotas
authors.initials: G
authors.lastname: Evindar
authors.forename: Robert A
authors.initials: RA
authors.lastname: Batey
mesh_terms: D006571:Heterocyclic Compounds; D006827:Hydantoins; D007097:Imines; D008958:Models, Molecular; D015394:Molecular Structure; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000737:chemistry; D010455:Peptides / Q000138:chemical synthesis*
chemical_list: D006571:Heterocyclic Compounds; D006827:Hydantoins; D007097:Imines; D009842:Oligopeptides; D010455:Peptides