Braca Alessandra, Prieto Josè Maria, De Tommasi Nunziatina, Tomè Franca, Morelli Ivano
Dipartimento di Chimica Bioorganica e Biofarmacia, Università di Pisa, Via Bonanno 33, 56126 Pisa, Italy.
Phytochemistry. 2004 Nov;65(21):2921-8. doi: 10.1016/j.phytochem.2004.07.013.
Phytochemical analysis of the polar extracts of the leaves of Helleborus viridis (Ranunculaceae) resulted in the isolation of two new furostanol saponins (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1-->3)-O-[6-acetyl-beta-D-glucopyranosyl-(1-->3)]-O-beta-D-glucopyranoside (1) and (25R)-26-[(alpha-L-rhamnopyranosyl)oxy]-22alpha-methoxyfurost-5-en-3beta-yl O-beta-D-glucopyranosyl-(1-->3)-O-beta-D-glucopyranosyl-(1-->3)-O-beta-D-glucopyranoside (2) and three new quercetin glycosides, quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1-->2)-beta-D-galactopyranoside-7-O-beta-d-glucopyranoside (3), quercetin 3-O-(2-E-caffeoyl)-alpha-L-arabinopyranosyl-(1-->2)-beta-D-galactopyranoside (4), and quercetin 3-O-alpha-L-arabinopyranosyl-(1-->2)-beta-D-galactopyranoside (5). The structures of the new compounds were determined by spectroscopic analysis, including 2D NMR data and mass spectrometry.
对绿菟葵（毛茛科）叶片的极性提取物进行植物化学分析，结果分离出两种新的呋甾烷醇皂苷，即(25R)-26-[(α-L-鼠李吡喃糖基)氧基]-22α-甲氧基呋甾-5-烯-3β-基 O-β-D-吡喃葡萄糖基-(1→3)-O-[6-乙酰基-β-D-吡喃葡萄糖基-(1→3)]-O-β-D-吡喃葡萄糖苷（1）和(25R)-26-[(α-L-鼠李吡喃糖基)氧基]-22α-甲氧基呋甾-5-烯-3β-基 O-β-D-吡喃葡萄糖基-(1→3)-O-β-D-吡喃葡萄糖基-(1→3)-O-β-D-吡喃葡萄糖苷（2），以及三种新的槲皮素糖苷，即槲皮素 3-O-(2-E-咖啡酰基)-α-L-阿拉伯吡喃糖基-(1→2)-β-D-吡喃半乳糖苷-7-O-β-D-吡喃葡萄糖苷（3）、槲皮素 3-O-(2-E-咖啡酰基)-α-L-阿拉伯吡喃糖基-(1→2)-β-D-吡喃半乳糖苷（4）和槲皮素 3-O-α-L-阿拉伯吡喃糖基-(1→2)-β-D-吡喃半乳糖苷（5）。通过光谱分析，包括二维核磁共振数据和质谱，确定了这些新化合物的结构。
