Stereoselective synthesis of (E)- and (Z)-1-azabicyclo[3.1.0]hex-2-ylidene dehydroamino acid derivatives
                                
                                    
                                        作者:Robert W. Armstrong、John E. Tellew、Edmund J. Moran                                    
                                    
                                        DOI:10.1021/jo00034a002
                                    
                                    
                                        日期:1992.4
                                    
                                    Bromination of dehydroamino acid derivatives with NBS or Br2/2,6-lutidine yields (E)- or (Z)-beta-bromo-dehydroamino acid derivatives selectively.  Subsequent intramolecular Michael addition-elimination of an aziridine proceeds with complete retention of olefin geometry to provide the 1-azabicyclo[3.1.0]hex-2-ylidene ring system proposed for the azinomycin series of antitumor antibiotics.