STUDIES ON GLYCOSIDES ⅤⅢ.TOTAL SYNTHESIS OF NEW ALKALOID GLYCOSIDES FROM SELAGINELLA DOEDERIENII

摘要

Two new alkaloids,hordenine-O- -L-rhamnopyranoside(Ⅰ)and hordenine-0-(6′-trans-cinnamoyl)-4′-O-β-D-glucopyranosyl- -L-rhamnopyranoside(Ⅲ)isolated from Selaginella doederleinii have been synthesized the first time.A new method,in which trifluoroacetoxyl group was used both as a good leavinggroup and a protecting group for synthesis of O-glycosides with high stereo-selectivity was reported.