Oleanene-Type Triterpene Glycosides from Puerariae Radix. IV. Six New Saponins from Pueraria lobata

Abstract

From Puerariae Radix, the root of Pueraria lobata (Leguminosae), six new oleanene-type triterpene glycoside, called kudzusaponins A₁ (1), A₂ (2), A₄ (3), A₅ (4), SA₄ (5), and SB₁ (6) were isolated together with kudzusaponin A₃ (7), soyasaponins SA₃ (8), and I (9). The structures of 1-6 were determined to be 3-O-α-L-rhamnopyranosyl-(1→2)-β-D-arabinopyranosyl-(1→2)-β-glucuronopyranosyl kudzusapogenol A 22-O-β-D-xylopyranoside, 3-O-β-D-galactopyranosyl-(1→2)-β-D-glucuronopyranosyl kudzusapogenol A, 3-O-β-D-glucopyranosyl-(1→2)-β-D-glucuranopyranosyl kudzusapogenol A, 3-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl-(1→2)-β-D-glucuronopyranosyl kudzusapogenol A, 3-O-β-D-glucuronopyranosyl-(1→2)-β-D-glucuronopyranosyl soyasapogenol A 22-O-α-L-arabinopyranoside, and 3-O-α-L-rhamnopyranosyl-(1→2)-β-D-galactopyranosyl-(1→2)-β-D-glucuronopyranosyl (β-fabatriosyl) soyasapogenol B 22-O-α-L-arabinopyranoside, respectively.