Antimalarial activity of new water-soluble dihydroartemisinin derivatives
摘要:
The usefulness of sodium artesunate (3), a water-soluble derivative of artemisinin (1), is impaired by its poor stability in aqueous solution. To overcome the ease of hydrolysis of the ester group in 3, a new series of derivatives of dihydroartemisinin (2) was prepared in which the solubilizing moiety, which contains a carboxylate group, is joined to dihydroartemisinin by an ether rather than an ester linkage. The new derivatives were prepared in good yield by treatment of dihydroartemisinin with an appropriate alcohol under boron trifluoride etherate catalysis at room temperature. All major condensation products are the beta isomer. Hydrolysis of the esters with 2.5% KOH/MeOH gave the corresponding potassium salts, which were converted to free acids (8b-d) by acidification. The derivatives were tested in vitro against two clones of human malaria, Plasmodium falciparum D-6 (Sierra Leone clone) and W-2 (Indochina clone). No cross-resistance to the antimalarial agents mefloquine, chloroquine, pyrimethamine, sulfadoxine, and quinine was observed. In general, the new compounds are more effective against the W-2 than the D-6 strain. Esters (5a-d) possess activity comparable to that of the parent compounds 1 and 2; however, conversion of the esters to their corresponding carboxylates (7a-d) or acids (8b-d), with the exception of artelinic acid (8d), drastically decreases the antimalarial activities in both cell lines. Artelinic acid, which is both soluble and stable in 2.5% K2CO3 solution, possesses superior in vivo activity against Plasmodium berghei than artemisinin or artesunic acid.
Electronically stabilized versions of the antimalarial acetal trioxanes artemether and artesunate
作者:Gary H. Posner、William A. Maio、Alvin S. Kalinda
DOI:10.1016/j.bmc.2008.03.010
日期:2008.5
From 9-substituted DHA, several new artemisinin-derived C-10 acetal ethers and esters were prepared with either a 9-fluoro or a 9-sulfonyl substituent. The very strong inductive electron-withdrawing C-9 substituent is shown to retard considerably C-10 ionization (acid-promoted etherification) of 9-fluoro-DHA and 9-sulfonyl-DHA. (C) 2008 Elsevier Ltd. All rights reserved.
LIN, AI JENG;KLAYMAN, DANIEL L.;MILHOUS, WILBUR K., J. MED. CHEM., 30,(1987) N 11, 2147-2150
作者:LIN, AI JENG、KLAYMAN, DANIEL L.、MILHOUS, WILBUR K.
DOI:——
日期:——
METHODS OF CANCER TREATMENT
申请人:Ferro Therapeutics, Inc.
公开号:US20200138829A1
公开(公告)日:2020-05-07
The present disclosure relates to a method of treating a subject with cancer with a ferroptosis inducer, including use of the ferroptosis inducer in combination with a second therapeutic agent.