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
A new kind of fluorine-containing amphiphiles -- perfluoroalkyl-containing steroidal glycos- ides were synthesized in good yield through perfluoroalkylation by means of sodium dithionite-initiated addition of R_FI to ...A new kind of fluorine-containing amphiphiles -- perfluoroalkyl-containing steroidal glycos- ides were synthesized in good yield through perfluoroalkylation by means of sodium dithionite-initiated addition of R_FI to olefinic system. Preliminary study showed that these glycosides could form vesicles in aqueous medium as observed by electron microscopy.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.
基金This work was pedially sapported by the National Natural Science Foundation of China.
文摘A new kind of fluorine-containing amphiphiles -- perfluoroalkyl-containing steroidal glycos- ides were synthesized in good yield through perfluoroalkylation by means of sodium dithionite-initiated addition of R_FI to olefinic system. Preliminary study showed that these glycosides could form vesicles in aqueous medium as observed by electron microscopy.
