从石楠属植物（石楠科）中分离得到的两种新三萜皂苷。
Two new triterpenoid saponins from Pittosporum senacia Putterlick (Pittosporaceae).
机构信息
EA 4267, FDE/UFC, Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7 bd. Jeanne d'Arc, BP 87900, 21079, Dijon cedex, France.
出版信息
Magn Reson Chem. 2012 Dec;50(12):798-802. doi: 10.1002/mrc.3876. Epub 2012 Sep 27.
From the branches of Pittosporum senacia Putterlick (Pittosporaceae), two new triterpenoid saponins, senaciapittosides A and B (1, 2), were isolated. Their structures were elucidated by extensive analysis of one- and two-dimensional nuclear magnetic resonance spectroscopy, high-resolution electrospray ionization mass spectrometry (HR-ESIMS) and chemical evidence as 3-O-[β-D-glucopyranosyl-(1 → 2)]-[α-L-arabinopyranosyl-(1 → 3)]-[α-L-arabinofuranosyl-(1 → 4)]-β-D-glucuronopyranosyl oleanolic acid 28-O-β-D-glucopyranosyl ester (1) and 3-O-[β-D-glucopyranosyl-(1 → 2)]-[α-L-arabinopyranosyl-(1 → 3)]-[α-L-arabinofuranosyl-(1 → 4)]-β-D-glucuronopyranosyl-22-O-α-L-arabinopyranosyl-21-acetoxy R1-barrigenol (2). Compound 2 presents an unusual glycosylation at C-22 of its aglycone.
从水石柏（柏科）的枝叶中分离得到两种新的三萜皂苷，分别命名为水石柏皂苷 A 和 B（1、2）。通过一维和二维核磁共振波谱、高分辨电喷雾电离质谱（HR-ESIMS）以及化学证据，确定了它们的结构，分别为 3-O-[β-D-吡喃葡萄糖基-(1→2)]-[α-L-吡喃阿拉伯糖基-(1→3)]-[α-L-呋喃阿拉伯糖基-(1→4)]-β-D-吡喃葡萄糖醛酸齐墩果酸 28-O-β-D-吡喃葡萄糖基酯（1）和 3-O-[β-D-吡喃葡萄糖基-(1→2)]-[α-L-吡喃阿拉伯糖基-(1→3)]-[α-L-呋喃阿拉伯糖基-(1→4)]-β-D-吡喃葡萄糖醛基-22-O-α-L-吡喃阿拉伯糖基-21-乙酰氧基 R1-巴利森苷元（2）。化合物 2 的苷元在 C-22 位存在一种不常见的糖基化。
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