Reações Ugi na construção de ciclopeptóides : provável inibidor do complexo Tat/TAR do vírus HIV-1

AUTOR(ES)

Otilie Eichler Vercillo

DATA DE PUBLICAÇÃO

2007

RESUMO

Peptoids are a class of oligomeric N-alkyl glycines that mimic the properties and the primary natural structure of peptides. These compounds differ from peptides in that the side chains are connected to the amide nitrogen rather than to the a-carbon atom, having no stereogenic centers. The Ugi 4- reaction is known to be one of the most versatile tools for the construction of the peptoid backbone. This reaction provides a diamide by combining four building blocks in one step: an amine, a carboxylic acid, an aldehyde or ketone, called oxo-component, and an isonitrile. With the aim of studying the Ugi reactions for the construction of cyclopeptoid backbones, the synthesis of cyclopentapeptoids, analogues to RGD peptides, was studied. RGD peptides, together with the integrins, their receptors, constitute the major system for cell adhesion and are implicated in many pathological processes. To accomplish the synthesis of these compounds a general route employing two consecutive Ugi reactions, in the construction of the acyclic precursor, and another Ugi reaction, in the peptoid macrocyclization, was developed. Subsequently, the methodology was employed in the synthesis of a cyclopeptoid that was suggested by molecular modeling calculations and computational inhibitor design of the Tat/TAR complex of the HIV-1 virus. In this model, the suggested structure emerged as the best virtual lead inhibitor and thus may be a potent approximation of an anti-HIV drug.

ASSUNTO(S)

hiv-1 reações ugi peptóides complexo tat/tar peptídios rgd quimica

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