A Dearomatizing, Thionium Ion Cyclization for the Synthesis of Functionalized, Azaspirocyclic Cyclohexadienones
                                
                                    
                                        作者:Caroline Ovens、Nathaniel G. Martin、David J. Procter                                    
                                    
                                        DOI:10.1021/ol8002095
                                    
                                    
                                        日期:2008.4.1
                                    
                                    Thionium ions, generated by the addition of thiols to N-benzylglyoxamides, undergo a dearomatizing spirocyclization. The alkyl or arylsultanyl group introduced during the thionium ion cyclization can act as a synthetic handle and a stereochemical control element during modifications of the azaspirocyclic frameworks (R(F) = CH(2)CH(2)C(8)F(17)).