Fused lactone nucleoside synthesis

S. Velazquez, S. Huss, and M.-J. Camarasa, Stereoselective synthesis of [3.3.0] fused lactones (y-butyrolactones) of sugars and nucleosides by free radical intramolecular cyclization, J. Chem. Soc. Chem. Commun. p. 1263 (1991). 

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