Regioselective functionalization of N-phthaloyl-substituted amino acid and peptide derivatives
                                
                                    
                                        作者:Christopher J. Easton、Craig A. Hutton、Giovanna Rositano、Eng Wui Tan                                    
                                    
                                        DOI:10.1021/jo00019a029
                                    
                                    
                                        日期:1991.9
                                    
                                    The free-radical reactions of a range of amino acid derivatives with N-bromosuccinimide are described.  The products and relative rates of these reactions indicate that the alpha-position of an N-phthaloyl-substituted alpha-amino acid derivative is much less reactive than that of a corresponding N-acyl amino acid derivative toward hydrogen atom transfer.  This is attributed to the proactive effects of acylamino and carboxyl substituents, in contrast to the counteractive effects of phthalimido and carboxyl groups.  The reactions exemplify procedures for the regiocontrolled functionalization of amino acid and peptide derivatives.