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1.
Sci Transl Med ; 11(491)2019 05 08.
Artigo em Inglês | MEDLINE | ID: mdl-31068442

RESUMO

Parasitic filarial nematodes cause debilitating infections in people in resource-limited countries. A clinically validated approach to eliminating worms uses a 4- to 6-week course of doxycycline that targets Wolbachia, a bacterial endosymbiont required for worm viability and reproduction. However, the prolonged length of therapy and contraindication in children and pregnant women have slowed adoption of this treatment. Here, we describe discovery and optimization of quinazolines CBR417 and CBR490 that, with a single dose, achieve >99% elimination of Wolbachia in the in vivo Litomosoides sigmodontis filarial infection model. The efficacious quinazoline series was identified by pairing a primary cell-based high-content imaging screen with an orthogonal ex vivo validation assay to rapidly quantify Wolbachia elimination in Brugia pahangi filarial ovaries. We screened 300,368 small molecules in the primary assay and identified 288 potent and selective hits. Of 134 primary hits tested, only 23.9% were active in the worm-based validation assay, 8 of which contained a quinazoline heterocycle core. Medicinal chemistry optimization generated quinazolines with excellent pharmacokinetic profiles in mice. Potent antiwolbachial activity was confirmed in L. sigmodontis, Brugia malayi, and Onchocerca ochengi in vivo preclinical models of filarial disease and in vitro selectivity against Loa loa (a safety concern in endemic areas). The favorable efficacy and in vitro safety profiles of CBR490 and CBR417 further support these as clinical candidates for treatment of filarial infections.


Assuntos
Antibacterianos/uso terapêutico , Descoberta de Drogas , Filariose/tratamento farmacológico , Filariose/parasitologia , Filarioidea/fisiologia , Quinazolinas/uso terapêutico , Animais , Antibacterianos/química , Antibacterianos/farmacologia , Modelos Animais de Doenças , Feminino , Filarioidea/efeitos dos fármacos , Filarioidea/microbiologia , Ensaios de Triagem em Larga Escala , Camundongos , Fenótipo , Quinazolinas/química , Quinazolinas/farmacologia , Bibliotecas de Moléculas Pequenas , Wolbachia/efeitos dos fármacos
2.
Tetrahedron Lett ; 56(23): 3251-3254, 2015 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-26185336

RESUMO

A novel gold-catalyzed divergent sysnthesis of furans and pyrroles employing readily available homopropargylic aldehydes and imines have been developed. The regiochemical outcome of this reaction is dependent on the substituent on the terminal alkyne of substrate. Thus, substrates possessing alkyl and aryl substituent at the alkyne moiety produce 2,3,5-substituted furans and pyrroles via a migratory cycloisomerizaton reaction. Whereas, their silicon analogues are capable to undergo a double migratory process leading to 2,3,4-substituted heterocycles.

3.
J Am Chem Soc ; 136(38): 13146-9, 2014 Sep 24.
Artigo em Inglês | MEDLINE | ID: mdl-25198147

RESUMO

A regioselective transition metal-catalyzed cycloisomerization reaction of boron-containing alkynyl epoxides toward C2- and C3-borylated furans has been developed. It was found that the copper catalyst as well as the gold catalyst with more basic triflate counterion favor boryl migration toward C3-borylated furans, whereas employment of the cationic gold hexafluoroantimonate affords C2-borylated furan via a formal 1,2-hydrogen shift.


Assuntos
Compostos de Boro/síntese química , Furanos/síntese química , Compostos de Boro/química , Catálise , Cobre/química , Ciclização , Furanos/química , Ouro/química , Isomerismo
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