The tin-mediated tandem 5-exo-dig-5-exo-trig radical cyclization of dibromoacetal 4a stereoselectively gives the angular 6,5,5-ring fused tricycle 6via spirocyclic acetal 5 in 93% yield.
H. Nagano, Y. Ohtani, E. Odake, J. Nakagawa, Y. Mori and T. Yajima, J. Chem. Res. (S), 1999, 338 DOI: 10.1039/A900444K
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