The 5-exo-dig radical cyclisation reaction of the bromoacetals 9, obtained from the enol ethers 8, and treatment of the resulting hemiacetal 10 with Jones′ reagent transforms the cyclic ketones 7 and 12 into α-spiro-β-methylene-γ-butyrolactones 11 and norbakkenolide-A 2.
A. Srikrishna, S. Nagaraju and G. V. R. Sharma, J. Chem. Soc., Chem. Commun., 1993, 285 DOI: 10.1039/C39930000285
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