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 ti...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 leaving group and a protecting group for synthesis of O-glycosides with high stereo- selectivity was reported.展开更多
文摘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 leaving group and a protecting group for synthesis of O-glycosides with high stereo- selectivity was reported.
