Preparation of Tethered Aldehyde Ynoates and Ynones by Ring Fragmentation of Cyclic γ-Oxy-β-hydroxy-α-diazo Carbonyls
                                
                                    
                                        作者:Ali Bayir、Cristian Draghici、Matthias Brewer                                    
                                    
                                        DOI:10.1021/jo902405f
                                    
                                    
                                        日期:2010.1.15
                                    
                                    Cyclic gamma-oxy-beta-hydroxy-alpha-diazo carbonyls undergo Lewis acid induced ring fragmentation to provide either ynoates or ynones tethered to an aldehyde, ketone, or ester. The fragmentation precursors are convenient to prepare by adding lithiated alpha-diazo carbonyls to alpha-oxy ketones. The fragmentation appears general and provides a variety of functional group-rich products in good to excellent yield.