Synthesis of methyl 2,4-di-O-methyl-3-O-(2-O-methyl-α-L-rhamnopyranosyl)-α-L-rhamnopyranoside and methyl 2,4-di-O-methyl-3-O--α-L-rhamnopyranoside: di- and tri-saccharide segments of a phe

Article abstract of DOI:10.1016/0008-6215(92)84070-9

Syntheses of the title glycosides are described.The critical O-glycosylations were carried out in the presence of boron trifluoride etherate with a high degree of α-selectivity.