桜樹皮のゲンクワニン配糖体について

抄録

Glucogenkwanin, C₂₂H₂₂O₁₁⋅2H₂O, faint yellow needles, m.p. 273-274°, was isolated from the bark of Prunus verecunda (Koidz.) Koehne and two kinds of P. Jamasakura variety (Japanese hill cherry). From the bark of P. Lannesiana variety (double-petalled species), sakuranin was obtained. When hydrolyzed with 5% H₂SO₄, glucogenkwanin gave genkwanin and glucose. By the methylation of glucogenkwanin with dimethyl sulfate and 30% KOH solution and following hydrolysis of the methylated product with 5% H₂SO₄, apigenin-7, 4′-dimetyl ether, m.p. 174-174.5°, was obtained. Glucogenkwanin, therefore, is genkwanin-5-glucoside.