Highly stereocontrolled synthesis of fluorinated 2,6-trans dihydropyrans via Prins cyclization
                                
                                    
                                        作者:Hai-Qing Luo、Xu-Hong Hu、Teck-Peng Loh                                    
                                    
                                        DOI:10.1016/j.tetlet.2009.12.068
                                    
                                    
                                        日期:2010.2
                                    
                                    A highly efficient method for the synthesis of fluorinated 2,6-trans dihydropyrans via BF3 center dot Et2O-promoted Prins cyclization of allenic alcohols and aldehydes is developed. Various 2,6-trans fluorodihydropyrans are obtained in moderate to good yields with excellent diastereoselectivities. (C) 2010 Elsevier Ltd. All rights reserved.