A Novel BF3.cntdot.OEt2-Catalyzed [3 + 2] Annulation of N-Cbz-.alpha.-Amino Aldehydes with Allyltrimethylsilane. Highly Stereoselective Synthesis of Cis-2,3,5-Trisubstituted Pyrrolidines
                                
                                    
                                        作者:Syun-ichi Kiyooka、Yasuhiro Shiomi、Haruhide Kira、Yuichi Kaneko、Shinji Tanimori                                    
                                    
                                        DOI:10.1021/jo00087a003
                                    
                                    
                                        日期:1994.4
                                    
                                    In the presence of BF3.OEt(2) (0.2 molar equiv), the reactions (-10 degrees C, CH2Cl2) of N-Cbz-alpha-amino aldehydes with allyltrimethylsilane produced pyrrolidines in good yields (70-80%), with high all-cis stereoselectivity at the C12, C-3, and C-5 positions, along with small amounts of the expected homoallylic alcohols.