STRUCTURES OF NEW AND KNOWN CYANOGLUCOSIDES FROM A NORTH-AMERICAN PLANT, PURSHIA-TRIDENTATA DC

A new cyanoglucoside, purshianin (1), was isolated together with a kno wn cyanoglucoside, menisdaurin (2a), from stems of Purshia tridentata DC. (Rosaceae) collected in Oregon, U.S.A. and the structure was estab lished as y)-4-hydroxy-2-cyclohexene-Delta(1,a)-acetonitrile (1) based on chemical and spectral evidence. Notably, the absolute structure of 1 and the revised stereostructure (2), y)-4-hydroxy-2-cyclohexene-Del ta(1,a)-acetonitrile for menisdaurin were decided based on combined st udies of difference NOE spectra and Dreiding model inspection.