Au-spicious! Under silver-free conditions, simple 3-silyloxy-1,5-enynes were converted into complex cyclopentenes by a gold(I)-catalyzed sequence that likely proceeds through a carbocyclization followed by a pinacol rearrangement. For the final demetalation step, isopropyl alcohol and N-iodosuccinimide are effectively utilized, and the resulting products are set up for a wealth of further reactions.
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Kirsch et al. (2007) studied this question.
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