Thermal Reactions of β-Hydroxysulfides Bearing Benzothiazole: Sulfenic Acid Trapping via a Spiro Intermediate
                                
                                    
                                        作者:Nobuhiko Yamada、Takanori Koyasu、Mayumi Sonami、Michiko Aoi、Shintaro Tashiro、Md. Chanmiya Sheikh、Yusuke Ishida、Wataru Kawashima、Toshiaki Yoshimura、Hiroyuki Morita                                    
                                    
                                        DOI:10.1080/10426501003773480
                                    
                                    
                                        日期:2010.5.27
                                    
                                    Benzothiazolyl 2-hydroxyethyl sulfoxide (1a) was found to afford bis[2-(2-oxobenzotiazolyl)-ethyl] disulfide (2a) in the presence of DBU at rt. 2a was formed by the condensation of corresponding sulfenic acid intermediate. Thermolyses of 1a in the presence of ethyl propiolate at 60-140 degrees C were carried out to succeed to trap sulfenic acid 6a as an intermediate. Trapping of 2-benzothiazolyloxyenthanesulfenic acid (6a) revealed that the thermal reaction proceeded via a five-membered spiro intermediate 5a.