Steroids of the spirostan and furostan series from plants of the genus Allium. XXVII. Alliosterol and allosides A and B from Allium suvorovii and Allium stipitatum — Structural analogs of furostanols

Two new glycosides of the cholestane series (allosides A and B) have been isolated from the fruit of the cocultivatedAllium suvorovii Rgi. andAllium stipitatum Rgl. (family Liliaceae, local name “anzur”). The acid hydrolysis of both compounds gave a sterol not previously described, which has been called alliosterol and has the structure of (22S)-cholest-5-ene-1ß, 3ß, 16ß, 22-tetraol, and the product of its dehvdration, which is (16S, 22S)-furost-5-ene-1ß, 3ß-diol. Alloside A is the 16-O-ß-D-galactopyranoside, and alloside B the 16-O-ß-D-galactopyranoside 1-O-ß-D-glucopyranoside of alliosterol.