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Doebner-type Pyrazolopyridine Carboxylic Acids in an Ugi Four-component Reaction

Abstract

Substituted 1-pyrazolo[3,4-]pyridine-4- and 1-pyrazolo[3,4-]pyridine-6-carboxamides have been synthetized through a Doebner-Ugi multicomponent reaction sequence in a convergent and versatile manner using diversity generation strategies: combination of two multicomponent reactions and conditions-based divergence strategy. The target products contain as pharmacophores pyrazolopyridine and peptidomimetic moieties with four points of diversity introduced from readily available starting materials including scaffold diversity. A small focused compound library of 23 Ugi products was created and screened for antibacterial activity.

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