Abstract
Total synthesis of the pentasaccharide related to the saponin isolated from the medicinal plant Aster tataricus L. f. is reported in the form of its allyl glycoside. The synthesis is accomplished by following a [3 + 2] block synthesis strategy where the trisaccharide acceptor and the disaccharide donor are rationally designed and obtained from semi-protected monosaccharides through stereoselective glycosylations either by activation of the thioglycoside or glycosyl trichloroacetimidate. The apiose moiety has been synthesized by literature procedure with little modification. The target pentasaccharide in the form of its allyl glycoside will be beneficial for further biological evaluation of the said structure and possible glycoconjugate formation as per need.
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