Reaction of α-halo ketone with 2-aminothiol: a new synthesis of thiazolidines with the oxo group migrated to the original position occupied by halogen atom
                                
                                    
                                        作者:Masatoshi Matsushita、T. Tomoyoshi Takahashi、Takamitsu Utsukihara、Yohei Shimizu、Rob J. Jansen、C. Akira Horiuchi                                    
                                    
                                        DOI:10.1016/j.tet.2007.06.041
                                    
                                    
                                        日期:2007.9
                                    
                                    The reaction of 2-bromo-3-oxo steroids with 2-aminoethanethiol led to the stereoselective formation of spiro[ steroid-3,2'-thiazolidin]2- ones as the major product. With both cyclic and acyclic alpha-halo alkanones, the reaction gave the thiazolidines with the oxo group migrated to the original position occupied by the halogen atom. In addition, it was found that the use of microwaves affords improvement of yields and shortening the reaction time in comparison with usual conditions. (C) 2007 Elsevier Ltd. All rights reserved.