Fragment based search for small molecule inhibitors of HIV-1 Tat-TAR
摘要:
Basic molecular building blocks such as benzene rings, amidines, guanidines, and amino groups have been combined in a systematic way to generate ligand candidates for HIV-1 TAR RNA. Ranking of the resulting compounds was achieved in a fluorimetric Tat-TAR competition assay. Although simple molecules such as phenylguanidine are inactive, few iteration steps led to a set of ligands with IC50 values ranging from 40 to 150 mu M. 1,7-Diaminoisoquinoline 17 and 2,4,6-triaminoquinazoline 22 have been further characterized by NMR titrations with TAR RNA. Compound 22 is bound to TAR at two high affinity sites and shows slow exchange between the free ligand and the RNA complex. These results encourage investigations of dimeric ligands built from two copies of compound 22 or related heterocycles. (C) 2014 Elsevier Ltd. All rights reserved.
Design, synthesis and cytotoxic evaluation of quinazoline-2,4,6-triamine and 2,6-diaminoquinazolin-4(3H)-one derivatives
作者:Audifás S. Matus-Meza、Marco A. Velasco-Velázquez、Francisco Hernández-Luis
DOI:10.1007/s00044-018-2188-7
日期:2018.7
quinazoline-2,4,6-triamine (quinazoline) and 2,6-diaminoquinazolin-4(3H)-one (quinazolinone) derivatives were designed, synthesized and evaluated as cytotoxic agents in three cancer cell lines (HCT-15, SKOV-3, and MDA-MB-231) using conventional MTT assay. Of the tested compounds, only eleven quinazoline derivatives showed activity against all the tested cell lines, at 24 h of exposure. Among them, the compounds
N9-Substituted 2,4-Diaminoquinazolines: Synthesis and Biological Evaluation of Lipophilic Inhibitors of <i>Pneumocystis carinii</i> and <i>Toxoplasma gondii</i> Dihydrofolate Reductase
作者:Aleem Gangjee、Ona O. Adair、Michelle Pagley、Sherry F. Queener
DOI:10.1021/jm800694g
日期:2008.10.9
N9-substituted 2,4-diaminoquinazolines were synthesized and evaluated as inhibitors of Pneumocystis carinii (pc) and Toxoplasma gondii (tg) dihydrofolate reductase (DHFR). Reduction of commercially available 2,4-diamino-6-nitroquinazoline 14 with Raney nickel afforded 2,4,6-triaminoquinazoline 15. Reductive amination of 15 with the appropriate benzaldehydes or naphthaldehydes, followed by N9-alkylation