Alkylmercury chloride bearing electron-deficient olefin 3 undergoes a Michael reaction intramolecularly via hypervalent intermediates 10 by the double activation method mediated by a Lewis acid and iodide anion to provide spirocyclic compounds 4 and 5.
Y. Takemoto, T. Ohra, Y. Yonetoku, K. Nishimine and C. Iwata, J. Chem. Soc., Chem. Commun., 1994, 81 DOI: 10.1039/C39940000081
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