Synthesis of 2 H -1,4-benzothiazin-3(4 H )-ones and 2 H -1,4-benzoselenazin-3(4 H )-ones with the aid of samarium(II) iodide
                                
                                    
                                        作者:Weihui Zhong、Yongmin Zhang                                    
                                    
                                        DOI:10.1016/s0040-4039(01)00360-4
                                    
                                    
                                        日期:2001.4
                                    
                                    Bis(o-nitrophenyl) disulfides or diselenides were easy to reduce by samarium(II) iodide to produce the active intermediates 2 in situ, which readily react with alpha -halocarboxylic derivatives to yield the corresponding products 2H-1,4-benzothiazin-3(4H)-ones and 2H-1,4-benzoselenazin-3(4H)-ones, respectively, in moderate to high yields under mild conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.