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Mercuration-Reductive Demercuration of Glycals: A Mild and Convenient Entry to 2-Deoxy-Sugars.--(BETTELLI, E.; CHERUBINI, P.; D'ANDREA, P.; PASSACANTILLI, P.; PIANCATELLI, G.; Tetrahedron 54 (1998) 22, 6011-6018; Dip. Chim., Univ. La Sapienza, CNR, I-00185 Roma, Italy; EN)

Stereoselective Synthesis of Tetrahydrofurans and Linear MethylEnol-Ethers from Glycals.-A general method is reported, which leads either to a ring-contraction or to ring-opening compounds with complete stereoselectivity. The flexibility and the utility of the method are shown by the TTN-promoted ring-transformations of cyclic enol-ethers such as aucubin (XI). -(BETTELLI, E.; D'ANDREA, P.; MASCANZONI, S.; PASSACANTILLI, P.; PIANCATELLI, G.; Carbohydr. Res. 306 (1998) 1-2, 221-230; Cent. Stud.