title: New Synthetic Approach for the Incorporation of 3,2-Hydroxypyridinone (HOPO) Ligands: Synthesis of Structurally Diverse Poly HOPO Chelators.
abstract: The HOPO sulfonamide reagent, 3, was prepared from commercial 2,3-dihydroxypyridine in four steps in good yields. Sulfonamide 3 readily underwent selective alkylation with dibromides in the presence of base or could be coupled to alcohols using Mitsunobu conditions. The utility of this nucleophilic HOPO reagent was demonstrated by the synthesis some tris and tetraHOPO chelators. This approach for tethering HOPO ligands is unique and flexible as shown by the preparation of HOPO/iminocarboxylic acid chelator 17.
authors.affiliation: Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003-8001.
authors.forename: Jayanthi
authors.initials: J
authors.lastname: Arumugam
authors.forename: Hayley A
authors.initials: HA
authors.lastname: Brown
authors.forename: Hollie K
authors.initials: HK
authors.lastname: Jacobs
authors.forename: Aravamudan S
authors.initials: AS
authors.lastname: Gopalan