A facile asymmetric synthesis of Δ3-2-Hydroxybakuchiol, Bakuchiol and ent-Bakuchiol
                                
                                    
                                        作者:Qian-Qian Xu、Qun Zhao、Guang-Sheng Shan、Xi-Cheng Yang、Qi-Yuan Shi、Xinsheng Lei                                    
                                    
                                        DOI:10.1016/j.tet.2013.10.064
                                    
                                    
                                        日期:2013.12
                                    
                                    A facile asymmetric synthesis of Delta(3)-2-Hydroxybakuchiol, Bakuchiol, and ent-Bakuchiol is described through one common intermediate bearing a chiral all-carbon quaternary carbon center, which involves stereoselectively unconjugated alkylation of the alpha,beta-unsaturated imide bearing Evans' auxiliary, Takai-Utimoto reaction, Negishi reaction, and Heck reaction as key steps. (C) 2013 Elsevier Ltd. All rights reserved.