A new cyanoglucoside, purshianin (1), was isolated together with a known cyanoglucoside, menisdaurin (2a), from stems of Purshia tridentata DC. (Rosaceae) collected in Oregon, U.S.A. and the structure was established as (4S, 6S)-(Z)-6-(β-D-glucopyranosyloxy)-4-hydroxy-2-cyclohexene-Δ1, α-acetonitrile (1) based on chemical and spectral evidence. Notably, the absolute structure of 1 and the revised stereostructure (2), (4S, 6R)-(Z)-6-(β-D-glucopyranosyloxy)-4-hydroxy-2-cyclohexene-Δ1, α-acetonitrile for menisdaurin were decided based on combined studies of difference NOE spectra and Dreiding model inspection.
从美国
俄勒冈州采集的 Purshia tridentata DC.(蔷薇科)的茎中分离出一种新的
氰基
葡萄糖苷--purshianin(1)和一种已知的
氰基
葡萄糖苷--menisdaurin(2a),并确定其结构为 (4S, 6S)-(Z)-6-(β-D-glucopyranosyloxy)-4-hydroxy-2-heyenelox.根据
化学和光谱证据,确定其结构为 (4S, 6S)-(Z)-6-(β-D-Glucopyranosyloxy)-4-hydroxy-2-cyclohexene-Δ1, α-acetonitrile (1)。值得注意的是,1 的绝对结构和修订后的立体结构 (2)、(4S, 6R)-(Z)-6-(β-
D-吡喃葡萄糖基氧基)-
4-羟基-2-
环己烯-Δ1, α-
乙腈为 menisdaurin,是根据差异 NOE 光谱研究和 Dreiding 模型检查综合确定的。