Silver(I) oxide-mediated regioselective 2-monoacylation in 3-O-benzyl-α-l-rhamnopyranosides and application in synthesis of a protected tetrasaccharide fragment of potent cytotoxic saponins gleditsiosides C and D

Efforts to total synthesis of philinopside E: convergent synthesis of the sulfated lanostane-type tetraglycoside

As part of total synthesis of philinopside E, herein we describe convergent synthesis of a triterpene glcoside composed of the sulfated tetrasaccharide residue identical to that of philinopside E and the algycone of lanost-7-en-3β-ol.

Organoboron-Promoted Regioselective Glycosylations in the Synthesis of a Saponin-Derived Pentasaccharide from Spergularia ramosa

Organoboron-mediated regioselective glycosylations were employed as key steps in the total synthesis of a branched pentasaccharide from a saponin natural product. The ability to use organoboron activation to differentiate OH groups in an unprotected glycosyl acceptor, followed by substrate-controlled reactions of the obtained disaccharide, enabled a streamlining of the synthesis relative to a protective group-based approach. This study revealed a matching/mismatching effect of the relative configuration of donor and acceptor on the efficiency of a regioselective glycosylation reaction, a problem that was solved through the development of a novel boronic acid-amine copromoter system for glycosyl acceptor activation.

Synthesis of key macrolactone structure of resin glycosides using a Keck macrolactonization method

We present in this paper the efficient synthesis of three macrocyclic lactone units which are core structures of natural resin glycosides by the use of a Keck macrolactonization approach.

Total synthesis of batatoside L

The total synthesis of batatoside L (1), a resin glycoside possessing cytotoxicity against laryngeal carcinoma cells, has been completed in a highly convergent manner. The most crucial step in this total synthesis was the efficient construction of the 18-membered macrolactone framework through the Corey-Nicolaou macrolactonization approach.