Firsttotalsynthesis of monoterpene diglycosides, neohancosides A (1) and B (2) fromCynanchumhancockianum were achieved stereoselectively using fluoride as a glycosyl donor. The absolute configurations of 1 and 2 were determined by enzymatic degradation of synthetic intermediates
Abstract Neohancosides A (1) and B (2) are monoterpene diglycosides isolated fromCynanchumhancockianum , which is a Chinese folk medicine having antitumor activity. Firsttotalsynthesis of 1 and 2 , (3 R )-linaloyl and (3 R )-8-hydroxylinaloyl 3- O - β -d-xylopyranosyl-(1 → 6)-β-d-glucopyranosides were achieved stereoselectively using fluoride 12b as a glycosyl donor. The asymmetry of C-3 in 1 and