Reactivity of 1-phenylsulfinyl-2-phenylsulfanylethylene (SOSE) with O-nucleophiles generated by potassium tert-butoxide
作者:Leonardo Pellizzaro、Elena Cabianca、Arnaud Tatibouët、Pierluigi Padovan、Fabrizio Fabris、Patrick Rollin、Ottorino De Lucchi
DOI:10.1016/j.tetlet.2007.03.125
日期:2007.5
E-1-Phenylsulfinyl-2-phenylsulfanylethylene (E-SOSE) reacts with O-nucleophiles generated by means of t-BuOK via an addition-elimination mechanism, thus affording the product of substitution of the phenylsulfanyl group in a stereo-conservative process. When used alone, the strongly basic and hindered tert-butoxide brings about elimination of either the phenylthiolate or phenylsulfinate groups. Z-SOSE is much more prone to elimination: either with t-BuOK alone or with other O-nucleophiles generated by t-BuOK, it always leads to products derived from elimination. Other alkaline tert-butoxides or other bases appear not as effective in generating species nucleophilic enough to react with E-SOSE. (c) 2007 Elsevier Ltd. All rights reserved.