K. Toshima et al., ALLYL C-GLYCOSIDATIONS OF TOTALLY UNPROTECTED GLYCALS AND ALLYLTRIMETHYLSILANE WITH TRIMETHYLSILYL TRIFLUOROMETHANESULFONATE (TMSOTF), Tetrahedron letters, 35(31), 1994, pp. 5673-5676
Allyl C-glycosidations of the totally unprotected glycals, L-rhamnal (
1), D-glucal (2), D-galactal (3) and D-fucal (4), with allyltrimethyls
ilane (5) using TMSOTf proceeded much more effectively than those of t
he corresponding acetylated glycals 10 similar to 13 to furnish the un
protected and 2,3-unsaturated allyl alpha-C-glycosides 6 similar to 9
in high yields, respectively.