[EN] METHOD AND DEVICE FOR THE SYNTHESIS OF ARTEMISININ<br/>[FR] PROCÉDÉ ET DISPOSITIF POUR LA SYNTHÈSE D'ARTÉMISININE
申请人:MAX PLANCK GESELLSCHAFT
公开号:WO2013030247A1
公开(公告)日:2013-03-07
The present invention is directed to a method for producing artemisinin having the formula (6) from dihydroartennisinic acid in a continuous flow reactor using singlet oxygen as well as to the continuous flow reactor for producing artemisinin.
METHOD AND DEVICE FOR THE SYNTHESIS OF ARTEMISININ
申请人:Seeberger Peter H.
公开号:US20140364630A1
公开(公告)日:2014-12-11
The present invention is directed to a method for producing artemisinin having the formula
from dihydroartemisinic acid in a continuous flow reactor using singlet oxygen as well as to the continuous flow reactor for producing artemisinin.
The mechanism of the spontaneous autoxidation of dihydroartemisinic acid
作者:Lai-King Sy、Geoffrey D Brown
DOI:10.1016/s0040-4020(01)01193-0
日期:2002.1
Dihydroartemisinic acid undergoes slow spontaneous autoxidation to artemisinin and other natural products, which have been reported from the medicinal plant Artemisia annua. The mechanism of this complex transformation is shown to involve four steps: (i) initial reaction of the Delta(4.5)-double bond of dihydroartemisinic acid with molecular oxygen, (ii) Hock cleavage of the resulting tertiary allylic hydroperoxide; (iii) oxygenation of the enol product from Hock cleavage; and (iv) cyclization of the resulting vicinal hydroperoxyl-aldehyde to the 1,2,4-trioxane system of artemisinin. (C) 2002 Elsevier Science Ltd. All rights reserved.
A Continuous-Flow Process for the Synthesis of Artemisinin
作者:Daniel Kopetzki、François Lévesque、Peter H. Seeberger
DOI:10.1002/chem.201204558
日期:2013.4.22
AbstractIsolation of the most effective antimalarial drug, artemisinin, from the plant sweet wormwood, does not yield sufficient quantities to provide the more than 300 million treatments needed each year. The high prices for the drug are a consequence of the unreliable and often insufficient supply of artemisinin. Large quantities of ineffective fake drugs find a market in Africa. Semisynthesis of artemisinin from inactive biological precursors, either dihydroartemisinic acid (DHAA) or artemisinic acid, offers a potentially attractive route to increase artemisinin production. Conversion of the plant waste product, DHAA, into artemisinin requires use of photochemically generated singlet oxygen at large scale. We met this challenge by developing a one‐pot photochemical continuous‐flow process for the semisynthesis of artemisinin from DHAA that yields 65 % product. Careful optimization resulted in a process characterized by short residence times. A method to extract DHAA from the mother liquor accumulated during commercial artemisinin extractions, a material that is currently discarded as waste, is also reported. The synthetic continuous‐flow process described here is an effective means to supplement the limited availability of artemisinin and ensure increased supplies of the drug for those in need.