Structure−Activity Relationships of the Antimalarial Agent Artemisinin. 7. Direct Modification of (+)-Artemisinin and In Vivo Antimalarial Screening of New, Potential Preclinical Antimalarial Candidates
摘要:
On the basis of earlier reported quantitative structure-activity relationship studies, a series of 9beta-16-(arylalkyl)-10-deoxoartemisinins were proposed for synthesis. Several of the new compounds 7 and 10-14 were synthesized, employing the key synthetic intermediate 23. In a second approach, the natural product (+)-artemisinic acid was utilized as an acceptor for conjugate addition, and the resultant homologated acids were subjected to singlet oxygenation and acid treatment to provide artemisinin analogues. Under a new approach, we developed A one step reaction for the interconversion of artemisinin 1 into artemisitene 22 that did not employ selenium-based reagents and found that 2-arylethyliodides would undergo facile radical-induced conjugate addition to the exomethylene lactone of 22 in good yield. The lactone carbonyls, were removed sequentially by diisobutylaluminum hydride reduction followed directly by a second reduction (BF3-etherate/Et3SiH) to afford the desired corresponding pyrans. Six additional halogen-substituted aromatic side chains were installed via 22 furnishing the bioassay candidates 15-20. The analogues were examined for in vitro antimalarial activity in the W-2 and D-6 clones of Plasmodium falciparum and were additionally tested. in vivo in Plasmodium berghei- and/or Plasmodium yoelii-infected mice. Several of the compounds emerged as highly potent orally active candidates without obvious toxicity, Of these, two were chosen for pharmacokinetic evaluation, 14 and 17.
[EN] ARTEMISININ-BASED PEROXIDE COMPOUNDS AS BROAD SPECTRUM ANTI-INFECTIVE AGENTS<br/>[FR] COMPOSES DE PEROXYDE A BASE D'ARTEMISININE TENANT LIEU D'AGENTS ANTI-INFECTIEUX A LARGE SPECTRE
申请人:UNIV MISSISSIPI
公开号:WO2003095444A1
公开(公告)日:2003-11-20
Described herein is the synthesis, bioassay results and utility of new C-9 and C-10 substituted artemisinin derivatives with easily functionalizable groups attached to the artemisinin skeleton through carbon chain or heteroatoms. Described also is the demonstration of this class of compounds for their broad-spectrum anti-parasitic activity. Certain of these analogs possess noticeable cytotoxicity deliberately focused on treatment of cancerous diseases.
Enantioselective Polyene Cyclization via Organo-SOMO Catalysis
作者:Sebastian Rendler、David W. C. MacMillan
DOI:10.1021/ja100185p
日期:2010.4.14
The first organocatalyticenantioselective radical polycyclization has been accomplished using singly occupied molecular orbital (SOMO) catalysis. The presented strategy relies on a selective single-electron oxidation of chiral enamines formed by condensation of polyenals with an imidazolidinone catalyst employing a suitable copper(II) oxidant. The reaction proceeds under mildly acidic conditions at
[EN] INHIBITORS OF D-AMINO ACID OXIDASE<br/>[FR] INHIBITEURS D'ACIDE AMINÉ D OXYDASE
申请人:UNIV JOHNS HOPKINS
公开号:WO2014025993A1
公开(公告)日:2014-02-13
D-amino acid oxidase (DAAO) inhibitors and methods of their use, either alone or in combination with D-serine or D-alanine, to facilitate allosteric activation of NMDA receptor-mediated neurotransmission and methods of their use as therapeutic agents for treating a subject afflicted with one or more cognitive-disorders, such as schizophrenia, including subjects suffering from negative symptoms and cognitive impairments, post-traumatic stress disorder (PTSD), or pain, are disclosed.
Artemisinin-based peroxide compounds as broad spectrum anti-infective agents
申请人:Avery Mitchell
公开号:US20050240034A1
公开(公告)日:2005-10-27
Described herein is the synthesis, bioassay results and utility of new C-
9
and C-
10
substituted artemisinin derivatives with easily functionalizable groups attached to the artemisinin skeleton through carbon chain or heteroatoms. Described also is the demonstration of this class of compounds for their broad-spectrum anti-parasitic activity. Certain of these analogs possess noticeable cytotoxicity deliberately focused on treatment of cancerous diseases.
D-amino acid oxidase (DAAO) inhibitors and methods of their use, either alone or in combination with D-serine or D-alanine, to facilitate allosteric activation of NMDA receptor-mediated neurotransmission and methods of their use as therapeutic agents for treating a subject afflicted with one or more cognitive-disorders, such as schizophrenia, including subjects suffering from negative symptoms and cognitive impairments, post-traumatic stress disorder (PTSD), or pain, are disclosed.