New one-pot method for the stereoselective synthesis of (E)-[beta(trifluoromethylsulfonyloxy)-alkenyl](aryl) iodonium triflatesстатья
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Аннотация:The reactions of reagent 1 with acetylenes leading to the alkenyl(aryl)iodonium triflates have been investigated. The results indicate that the very simple and efficient one-pot conversion of terminal alkynes into alkenyl(aryl)iodonium triflates described in this paper presents several advantages over the previously described procedure. The stereoselectivity of these reactions is discussed on the basis of physico-chemical evidence including IR, NMR spectroscopy and X-ray analysis. It is shown thar these reactions are accompanied with anti-addition to afford (E)-[beta-(trifyloxy)alkenyl](aryl) iodonium triflates in moderate to excellent yields. A possible mechanism is also discussed. (C) 1997 Published by Elsevier Science Ltd.