New Method for the Synthesis of Ether Derivatives of Artemisinin
作者:Pranjal P. Bora、Nabajyoti Baruah、Ghanashyam Bez、Nabin C. Barua
DOI:10.1080/00397911.2010.538887
日期:2012.4.15
Dihydroartemisinin can be converted to its ether derivatives in good yields by reaction with different alcohols in the presence of a catalytic amount of dodecatungstophosphoric acid hydrate. Easy handling, trouble-free workup by filtration, excellent yields, and very short reaction times are some of the highlights of this protocol.
KR20220089943A
申请人:——
公开号:——
公开(公告)日:——
Unified Mechanistic Framework for the Fe(II)-Induced Cleavage of Qinghaosu and Derivatives/Analogues. The First Spin-Trapping Evidence for the Previously Postulated Secondary C-4 Radical
Qinghaosu and derivatives were easily reduced by ferrous sulfate in aqueous acetonitrile to give results different from those reported for other reducing systems. The unstable epoxide 7, a compound that was postulated earlier as a species responsible for the antimalarial activity, now has been isolated and characterized. The earlier speculative secondary C-4 radical has also been trapped with 2-me
C-10 Ester and Ether Derivatives of Dihydroartemisinin − 10-α Artesunate, Preparation of Authentic 10-β Artesunate, and of Other Ester and Ether Derivatives Bearing Potential Aromatic Intercalating Groups at C-10
作者:Richard K. Haynes、Ho-Wai Chan、Man-Ki Cheung、Wai-Lun Lam、May-Kei Soo、Hing-Wo Tsang、Arnd Voerste、Ian D. Williams
providing new C-10 ester and ether derivatives of the antimalarial drug dihydroartemisinin (DHA, 2) have been examined. β-Artesunate has been prepared for the first time, and has been differentiated from the antimalarial α-artesunate; the latter has been incorrectly designated as the β-epimer in Chemical Abstracts and some primary literature. New ester and ether derivatives bearing potential intercalating