An efficient route to 3,4-dihydroxylphenylalanine (DOPA) and DOPA pept des was described by oxidation of L-tyrosine and L-tyrosine derivatives with 2-iodoxybenzoic acid (IBX) DOPA was obtained after ail Situ reduction of the corresponding ortho-Cl U I none with sodium dithionite. Oxidation reactions proceeded Ill good yields and high chemo- and regio-selectivity The chirality of the DOPA residue was retained under the reaction conditions The efficiency and the selectivity of the reaction were successfully tested using recyclable polymer-supported IBX (C) 2009 Elsevier Ltd. All rights reserved
Selective Synthesis of DOPA and DOPA Peptides by Native and Immobilized Tyrosinase in Organic Solvent
4‐Dihydroxyphenylalanine (DOPA)‐containing peptides and proteins provide attractive design paradigms for pharmaceutical applications and engineering of synthetic polymers. An efficient and selective route to DOPApeptides by oxidation of L‐tyrosine derivatives with tyrosinase is reported. The efficiency of the procedure was tested by using successively recycled tyrosinaseimmobilized on Eupergit®C250L and