Expanding the Scope of Mn(OAc)<sub>3</sub>-Mediated Cyclizations:  Synthesis of the Tetracyclic Core of Tronocarpine
                                
                                    
                                        作者:Jakob Magolan、Michael A. Kerr                                    
                                    
                                        DOI:10.1021/ol061698+
                                    
                                    
                                        日期:2006.9.1
                                    
                                    Pyrroles, indoles, and surprisingly, indolines, when equipped with a pendant malonyl group on the nitrogen atom, were effective substrates in a Mn(III)-mediated oxidative cyclization reaction, yielding the 1,2-annulated products in good to excellent yields. When indole acetonitrile was used as a substrate this method provided a rapid synthesis of a tetracyclic tronocarpine subunit.