Furostane‐Type Steroidal Saponins from the Roots of Chlorophytum borivilianum

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 2 D ‐NMR analyses (COSY, TOCSY, NOESY, HSQC, and HMBC) and mass spectrometry.