Abstract
Four new furostanol steroid saponins, borivilianosides A–D (1–4, resp.), corresponding to (3__β__,5__α__,22__R__,25__R__)‐26‐(β‐D‐glucopyranosyloxy)‐22‐hydroxyfurostan‐3‐yl O‐β‐D‐xylopyranosyl‐(1→3)‐O‐β‐D‐glucopyranosyl‐(1→4)‐O‐[α‐L‐rhamnopyranosyl‐(1→2)]‐β‐D‐galactopyranoside (1), (3__β__,5__α__,22__R__,25__R__)‐ 26‐(β‐D‐glucopyranosyloxy)‐22‐methoxyfurostan‐3‐yl O‐β‐D‐xylopyranosyl‐(1→3)‐O‐β‐D‐glucopyranosyl‐(1→4)‐O‐[α‐L‐rhamnopyranosyl‐(1→2)]‐β‐D‐galactopyranoside (2), (3__β__,5__α__,22__R__,25__R__)‐26‐(β‐D‐glucopyranosyloxy)‐22‐methoxyfurostan‐3‐yl O‐β‐D‐xylopyranosyl‐(1→3)‐O‐[β‐D‐glucopyranosyl‐(1→2)]‐O‐β‐D‐glucopyranosyl‐(1→4)‐β‐D‐galactopyranoside (3), and (3__β__,5__α__,25__R__)‐26‐(β‐D‐glucopyranosyloxy)furost‐20(22)‐en‐3‐yl O‐β‐D‐xylopyranosyl‐(1→3)‐O‐[β‐D‐glucopyranosyl‐(1→2)]‐O‐β‐D‐glucopyranosyl‐(1→4)‐β‐D‐galactopyranoside (4), together with the known tribuluside A and (3__β__,5__α__,22__R__,25__R__)‐26‐(β‐D‐glucopyranosyloxy)‐22‐methoxyfurostan‐3‐yl O‐β‐D‐xylopyranosyl‐(1→2)‐O‐[β‐D‐xylopyranosyl‐(1→3)]‐O‐β‐D‐glucopyranosyl‐(1→4)‐O‐[α‐L‐rhamnopyranosyl‐(1→2)]‐β‐D‐galactopyranoside were isolated from the dried roots of Chlorophytum borivilianum Sant and Fern. Their structures were elucidated by 2D‐NMR analyses (COSY, TOCSY, NOESY, HSQC, and HMBC) and mass spectrometry.