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1.
J Pharm Anal ; 11(5): 638-645, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34765277

RESUMO

The first combined experimental and theoretical study on the ionization and lipophilic properties of peptide nucleic acid (PNA) derivatives, including eleven PNA monomers and two PNA decamers, is described. The acidity constants (pKa) of individual acidic and basic centers of PNA monomers were measured by automated potentiometric pH titrations in water/methanol solution, and these values were found to be in agreement with those obtained by MoKa software. These results indicate that single nucleobases do not change their pKa values when included in PNA monomers and oligomers. In addition, immobilized artificial membrane chromatography was employed to evaluate the lipophilic properties of PNA monomers and oligomers, which showed the PNA derivatives had poor affinity towards membrane phospholipids, and confirmed their scarce cell penetrating ability. Overall, our study not only is of potential relevance to evaluate the pharmacokinetic properties of PNA, but also constitutes a reliable basis to properly modify PNA to obtain mimics with enhanced cell penetration properties.

2.
Artigo em Chinês | WPRIM (Pacífico Ocidental) | ID: wpr-908784

RESUMO

The first combined experimental and theoretical study on the ionization and lipophilic properties of peptide nucleic acid(PNA)derivatives,including eleven PNA monomers and two PNA decamers,is described.The acidity constants(pKa)of individual acidic and basic centers of PNA monomers were measured by automated potentiometric pH titrations in water/methanol solution,and these values were found to be in agreement with those obtained by MoKa software.These results indicate that single nucleobases do not change their pKa values when included in PNA monomers and oligomers.In addition,immobilized artificial membrane chromatography was employed to evaluate the lipophilic properties of PNA monomers and oligomers,which showed the PNA derivatives had poor affinity towards membrane phospholipids,and confirmed their scarce cell penetrating ability.Overall,our study not only is of po-tential relevance to evaluate the pharmacokinetic properties of PNA,but also constitutes a reliable basis to properly modify PNA to obtain mimics with enhanced cell penetration properties.

3.
Org Lett ; 14(15): 3994-7, 2012 Aug 03.
Artigo em Inglês | MEDLINE | ID: mdl-22830485

RESUMO

A facile, fluoride-induced transition-metal-free chemoselective α-arylation of ß-dicarbonyl compounds (malonamide esters) at room temperature using aryne intermediates has been demonstrated. Selective mono- or diarylation and generation of a quaternary benzylic stereocenter have also been achieved. The methodology will be highly useful for the synthesis of a library of CNS depressant barbiturate drugs like Phenobarbital.


Assuntos
Alcinos/química , Malonatos/química , Elementos de Transição , Catálise , Técnicas de Química Combinatória , Ésteres , Hidrocarbonetos Aromáticos/síntese química , Hidrocarbonetos Aromáticos/química , Cetonas/síntese química , Cetonas/química , Estrutura Molecular , Estereoisomerismo , Temperatura
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