20460-33-7Relevant articles and documents
Triterpenes from the Leaves of Parsonsia Laevigata
Ogihara, Kazuhito,Higa, Matsutake,Hokama, Kozo,Suga, Takayuki
, p. 783 - 786 (2007/10/02)
A novel taraxerane-type triterpene-diol, in addition to taraxerol and lupeol, was isolated from the leaves of Parsonsia laevigata.Its structure was shown to be (4β)-D-friedoolean-14-ene-3β,24-diol (taraxer-14-ene-3β,24-diol) by a combination of chemical and spectroscopic methods.Key Word Index - Parsonsia laevigata; Apocynaceae; taraxerane-type triterpenoid; (4β)-D-friedoolean-14-ene-3β,24-diol.
Terpenoids and Related Compounds: Part XXXI - Stereospecific Reduction of Triterpenoid Ketones with Lithium and Ethylenediamine
Sengupta, Pasupati,Das, Saktipada,Das, Kanchan
, p. 1113 - 1114 (2007/10/02)
Hindered triterpenoid ketones are reduced in excellent yields to the corresponding thermodynamically more stable alcohols on stereospecific reduction with lithium and ethylenediamine.
Triterpenoids of the Bark of Pieris japonica D. Don (Japenese Name: Asebi). II. 13C Nuclear Magnetic Resonance of the γ-Lactones of Ursane- and Oleane-type Triterpenes
Katai, Masaaki,Terai, Tadamasa,Meguri, Haruo
, p. 1567 - 1571 (2007/10/02)
Eight triterpenoids and a sterol were isolated from the bark of Pieris japonica D.Don (Japenese name: asebi, Ericaceae) and have been elucidated as 3β-acetoxyurs-11-en-28,13-olide, 3β-acetoxy-12α-hydroxyolean-28,13-olide, 3β-acetoxy-28-hydroxyurs-12-ene, 3β,28-dihydroxyurs-12-ene, 3β-acetoxyurs-12-en-28-al, taraxeryl-acetate, taraxerol, taraxerone and β-sitosterone by a combination of chemical and spectroscopic studies. 13C Nuclear magnetic resonance spectral analysis of several γ-lactones of the ursane and oleanane series was undertaken, and all the carbons were assigned by means of single frequency off-resonance and selective decoupling methods and by comparison of the signals with those of methyl esters of acetyl ursolic acid and acetyl oleanolic acid.Keywords - Pieris japonica; bark; triterpenoid; ursane-type γ-lactone; oleanane-type γ-lactone; 1H-NMR; 13C-NMR