Viana Francisco Arnaldo, Pouliquen Yvone Brígido M, Andrade-Neto Manoel, Santiago Gilvandete Maria P, Pessoa Otília Deusdênia L, Rodrigues-Filho Edson, Braz-Filho Raimundo
Universidade do Estado do Rio Grande do Norte, Mossoró, RN 59610-210, Brazil.
Magn Reson Chem. 2004 Aug;42(8):695-9. doi: 10.1002/mrc.1421.
A detailed NMR study and full assignments of the 1H and 13C spectral data for two novel triterpenoid saponins isolated from the stem bark of Pentaclethra macroloba (Willd.) Kuntze are described. Their structures were established using a combination of 1D and 2D NMR techniques including 1H,1H-COSY, TOCSY, NOESY, gs-HMQC and gs-HMBC, and also electrospray ionization mass spectrometry and chemical methods. The structures were established as 3beta-O-([O-beta-D-glucopyranosyl-(1-->2)-O-beta-D-glucopyranosyl-(1-->4)-O-beta-D-glucopyranosyl-(1-->3)-O-alpha-L-rhamnopyranosyl-(1-->2)]-[O-beta-D-glucopyranosyl-(1-->3)-O-beta-D-glucopyranosyl-(1-->4)])-alpha-L-arabinopyranosylhederagenin (1) and 3beta-O-)[O-beta-D-glucopyranosyl-(1-->2)-O-beta-D-glucopyranosyl-(1-->4)-O-beta-D-glucopyranosyl-(1-->3)-O-alpha-L-rhamnopyranosyl-(1-->2)]-[O-beta-D-glucopyranosyl-(1-->3)-O-beta-D-glucopyranosyl-(1-->4)])-alpha-L-arabinopyranosyloleanolic acid (2).
描述了从大果豆科（Pentaclethra macroloba (Willd.) Kuntze）茎皮中分离出的两种新型三萜皂苷的详细核磁共振研究以及对其1H和13C光谱数据的全面归属。使用包括1H、1H-COSY、TOCSY、NOESY、gs-HMQC和gs-HMBC在内的一维和二维核磁共振技术，以及电喷雾电离质谱法和化学方法确定了它们的结构。结构确定为3β-O-([O-β-D-吡喃葡萄糖基-(1→2)-O-β-D-吡喃葡萄糖基-(1→4)-O-β-D-吡喃葡萄糖基-(1→3)-O-α-L-吡喃鼠李糖基-(1→2)]-[O-β-D-吡喃葡萄糖基-(1→3)-O-β-D-吡喃葡萄糖基-(1→4)])-α-L-阿拉伯吡喃糖基hederagenin（1）和3β-O-)[O-β-D-吡喃葡萄糖基-(1→2)-O-β-D-吡喃葡萄糖基-(1→4)-O-β-D-吡喃葡萄糖基-(1→3)-O-α-L-吡喃鼠李糖基-(1→2)]-[O-β-D-吡喃葡萄糖基-(1→3)-O-β-D-吡喃葡萄糖基-(1→4)])-α-L-阿拉伯吡喃糖基齐墩果酸（2）。
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