Haloacetals derived from pyranosidic allylic alcohols or allylic hemiacetals were stereospecifically cyclized using tributyltin hydride as radical promotor to give fused furanoses; the reaction was also applied to a propargylic glycoside which cyclized readily into a vinylstannane, precursor of methylene furanose.
Y. Chapleur and N. Moufid, J. Chem. Soc., Chem. Commun., 1989, 39 DOI: 10.1039/C39890000039
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