The behaviour of qinghaosu (artemisinin) in the presence of non-heme iron(II) and (III)
作者:Richard K. Haynes、Simone C. Vonwiller
DOI:10.1016/0040-4039(95)02142-6
日期:1996.1
In aprotic solvents with FeCl3, cysteine or FeCl2, qinghaosu (artemisinin) undergoes rearrangement to give the tetrahydrofuran acetate, 4-hydroxydesoxoqinghoasu or the enol lactone as the major product depending on the amount of catalyst used and the polarity of the reaction medium.
The role of the 12-carboxylic acid group in the spontaneous autoxidation of dihydroartemisinic acid
作者:Lai-King Sy、Geoffrey D Brown
DOI:10.1016/s0040-4020(01)01192-9
日期:2002.1
Three of the four steps in the slow spontaneous autoxidation of dihydroartemisinic acid to artemisinin ('ene-type' reaction of molecular oxygen with the Delta(4.5) double bond, Hock cleavage of the resulting tertiary allylic hydroperoxide, oxygenation of the enol product from Hock cleavage and cyclization of the resulting vicinal hydroperoxyl-aldehyde to the 1,2,4-trioxane system of artemisinin) are shown to be assisted by the proximity of the 12-carboxylic acid functional group in dihydroartemisinic acid to the functional groups participating in these reactions. (C) 2002 Elsevier Science Ltd. All rights reserved.