The First Example of the 1-Chalcogene-Substituted Formylolefination of the Ketones and Aldehydes Using 1-Lithio-2-ethoxyvinyl Chalcogenides
                                
                                    
                                        作者:Mitsuhiro Yoshimatsu、Kiyomi Oguri、Kazunari Ikeda、Satoshi Gotoh                                    
                                    
                                        DOI:10.1021/jo980487i
                                    
                                    
                                        日期:1998.6.1
                                    
                                    The alpha-chalcogene-substituted formylolefinations of ketones and aldehydes proceeded using 1-lithio-2-ethoxyvinyl chalcogenides/PPSE or TMSOTf produce the alpha-chalcogenoformylolefinated products 4a-1 in high yields. Tandem-formylolefination provided the (2Z,4Z)-2,4-bis(chalcogeno)pent-2,4-dienals 5d,h,i and (2Z,4Z,6Z)-2,4,6-tris(phenylthio)hept-2, derivatives 7d and 8d, respectively.