financially supported by the National Natural Science Foundation of China(No.30300434);the 0utstanding Youth Foundation of Sichuan Province(No.04ZQ026-039).
A series of acyls (Ac, Bz and Ts) were introduced regioselectively to the 2-hydroxyl in methyl and ally 3-O-benzyl-α-L-rhamnopyranosides mediated by silver(I) oxide in the presence of a catalytic amount of potass...