Conversion of Quassin into 15β-[(<i>E</i>)-3,4-dimethyl-2-pentenoyloxy]quassin. A<i>D</i>-Ring Analog of Bruceantin
作者:Tatsushi Murae、Takeyoshi Takahashi
DOI:10.1246/bcsj.54.941
日期:1981.3
Quassin was transformed in five steps into 15β-[(E)-3,4-dimethyl-2-pentenoyloxy]quassin.
经过五个步骤将夸松转化为 15β-[(E)-3,4-二甲基-2-戊烯酰氧基]夸松。
Enhancement of the Antiplasmodial Activity of Quassin by Transformation into a γ-Lactone
作者:Caroline Lang'at-Thoruwa、Geoffrey C. Kirby、J. David Phillipson、David C. Warhurst、Robert A. Watt、Colin W. Wright
DOI:10.1021/np030107a
日期:2003.12.1
The naturally occurring bitter principle quassin (1) was converted chemically into the gamma-lactone quassilactone (13) in an attempt to enhance its antiplasmodial activity. The in vitro antiplasmodial activity of 13 against Plasmodium falciparum (K1) (IC(50) = 23 microM) was 40-fold greater than that of 1. However, one of the intermediates, compound 8, the 15beta-hydroxy,16-O-m-chlorobenzoyl analogue