Peptide-Catalyzed Highly Asymmetric Cross-Aldol Reaction of Aldehydes to Biomimetically Synthesize 1,4-Dicarbonyls
                                
                                    
                                        作者:Zhi-Hong Du、Bao-Xiu Tao、Meng Yuan、Wen-Juan Qin、Yan-Li Xu、Pei Wang、Chao-Shan Da                                    
                                    
                                        DOI:10.1021/acs.orglett.0c01407
                                    
                                    
                                        日期:2020.6.5
                                    
                                    beta-Turn tetrapeptides were demonstrated to catalyze asymmetric aldol reaction of alpha-branched aldehydes and acarbonyl aldehydes, i.e. glyoxylates and alpha-ketoaldehydes, to biomimetically synthesize acyclic all-carbon quaternary center-bearing 1,4-dicarbonyls in high yield and excellent enantioselectivity under mild conditions. The spatially restricted environment of the tetrapeptide warrants high enantioselectivity and yield with broad substrates. Using this protocol, (R)-pantolactone, the key intermediate of vitamin BS, was readily accessed in a practical, efficient, and environmentally benign process from inexpensive starting materials.