作者:Catherine Mirand、Mario Papa、Dominique Cartier、Jean Lévy                                    
                                    
                                        DOI:10.1016/s0040-4039(97)00293-1
                                    
                                    
                                        日期:1997.3
                                    
                                    The oxindolic methylketones 13, 15, 20 and 22 were cyclized in one step with para-toluene-sulfonic acid to the tetracyclic enaminoketones 16, 17, 23 and 24, respectively. (C) 1997 Elsevier Science Ltd.