The NMR studies on two new furostanol saponins from Agave sisalana leaves

✍ Scribed by Peng Zou; Jing Fu; He-shui Yu; Jie Zhang; Li-ping Kang; Bai-ping Ma; Xian-zhong Yan

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 214 KB
• Volume: 44
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1904

✦ Synopsis

Abstract

The detailed NMR studies and full assignments of the ^1^H and ^13^C spectral data for two new furostanol saponins isolated from Agave sisalana leaves are described. Their structures were established using a combination of 1D and 2D NMR techniques including ^1^H, ^13^C, ^1^H^1^H COSY, TOCSY, HSQC, HMBC and HSQC‐TOCSY, and also FAB‐MS spectrometry and chemical methods. The structures were established as (25__S__)‐26‐(β‐D‐glucopyranosyl)‐22 ξ‐hydroxyfurost‐12‐one‐3β‐yl‐O‐α‐L‐rhamnopyranosyl‐(1→4)‐β‐D‐glucopyranosyl‐(1→3)‐O‐[O‐β‐D‐glucopyranosyl‐(1→2)]‐O‐β‐D‐glucopyranosyl‐(1→4)‐β‐D‐galacto‐ pyranoside (1) and (25__S__)‐26‐(β‐D‐glucopyranosyl)‐22ξ‐hydroxyfurost‐5‐en‐12‐one‐3β‐yl‐O‐α‐L‐rhamno‐ pyranosyl‐(1→4)‐β‐D‐glucopyranosyl‐(1→3)‐O‐[O‐β‐D‐glucopyranosyl‐(1→2)]‐O‐β‐D‐glucopyranosyl‐ (1→4)‐β‐D‐galactopyranoside (2). Copyright © 2006 John Wiley & Sons, Ltd.