Inhibition of Leukocyte Functions by the Alkaloid Isaindigotone from <i>Isatis indigotica</i> and Some New Synthetic Derivatives
作者:Pedro Molina、Alberto Tárraga、Antonia Gonzalez-Tejero、Immaculada Rioja、Amalia Ubeda、M. Carmen Terencio、M. José Alcaraz
DOI:10.1021/np0101898
日期:2001.10.1
The alkaloid isaindigotone (1a) and seven derivatives have been synthesized to study their influence on several leukocyte functions and the generation of inflammatory mediators. Isaindigotone (1a) was found to be a scavenger of superoxide generated either by the hypoxanthine/xanthine oxidase system or stimulated human neutrophils. Isaindigotone (1a) and its acetylated derivative (1b) also inhibited
Deoxyvasicinone has been used as the key intermediate to prepare the alkaloids isaindigotone and luotonin A. This intermediate is directly converted into isaindigotone by condensation with 4-acetoxy-3,5-dimethoxybenzaldehyde; alternatively oxidation with SeO2 afforded the pyrrolo[2,1-b]quinazoline-3,9-dione, a putative precursor of the luotonin A.
脱氧凡西酮是制备生物碱靛蓝酮和洛托宁A的关键中间体。该中间体与4-乙酰氧基-3,5-二甲氧基苯甲醛缩合直接转化为靛蓝酮;或者用 SeO2 氧化,得到吡咯并[2,1-b]喹唑啉-3,9-二酮,这是洛豆素 A 的假定前体。