Asymmetric Carbon−Carbon Bond Formations by Conjugate Additions of Lithiated <i>N</i>-Boc Allylic Amines to Nitroalkenes:  Enantioselective Synthesis of Functionalized Cyclopentanoids
                                
                                    
                                        作者:Timothy A. Johnson、Michael D. Curtis、Peter Beak                                    
                                    
                                        DOI:10.1021/ol026277g
                                    
                                    
                                        日期:2002.8.1
                                    
                                    [GRAPHICS]Allylic organolithiums generated by enantioselective deprotonation of N-Boc-N-(p-methoxyphenyl) allylic amines undergo conjugate additions with nitroalkenes to provide enecarbamates containing two contiguous stereogenic centers in good yields with high diastereoselectivities and enantioselectivities. Further elaboration of these adducts to enantioenriched substituted cyclopentanones and aminocyclopentanes is reported.