Castle, Kerstin, Hau, Chee-San, Sweeney, Joseph B. and Tindall, Craig (2003) The First Preparation of β-Lactones by Radical Cyclization. Organic Letters, 5 (5). pp. 757-759. ISSN 1523-7060

β-Lactones have, for the first time, been prepared by 4-exo-trig radical cyclization. Thus, α-ethenoyloxy radicals react in the presence of tributylstannane in a photothermal process to give β-lactones. Highest yields were obtained when groups capable of stabilizing a carbon-centered radical were present at the 3-position of the alkenoate acceptor.

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