Oxidative Deaminations and Deisatinylations of Ugi-Azide and Ugi-3CR Products: A Two-Step MCR-Oxidation Protocol toward Functionalized α-Ketoamides and α-Ketotetrazoles
functionalized α-ketoamide and α-ketotetrazole small-molecule peptidomimetic-like building blocks from prototypical synthons with two points of diversity. Incorporation of chalcone and alkynyl moieties with further ring-forming reactions enables access to additional novel heterocyclic ring systems, including a unique and potentially highly pharmacologically relevant scaffold, a 1,2-selenazol-3(2H)-one
An easy synthesis of diversely functionalized 2H-chromenes and amido amines by an enol-Ugi reaction
作者:Ana G. Neo、Teresa G. Castellano、Carlos F. Marcos
DOI:10.3998/ark.5550190.p009.775
日期:——
The first synthesis of methyl 2-(4-hydroxy-2-oxo-2H-chromen-3-yl)-2-oxoacetate is described. This compound has been successfully used in a multicomponent enol-Ugi condensation with imines and isocyanides affording 4-aminoacyl-coumarin enamines in a highly atom-economic and convergent process. Furthermore, the postcondensation transformation of these adducts allows the straightforward synthesis of both
In the present work, a mild and simple synthesis of α-amino amides has been developed via the one-pot three-component ABC type Ugi reaction of a wide variety of aromatic aldehydes and primary aromaticamines, and two different aliphatic isocyanides. The reactions took place rapidly at room temperature in the presence of 1-propanephosphonic acid cyclic anhydride (T3P®), rendering possible the highly
Boric acid catalyzed Ugi three-component reaction in aqueous media
作者:Atul Kumar、Deepti Saxena、Maneesh Kumar Gupta
DOI:10.1039/c3ra23087b
日期:——
B(OH)3 catalyzed Ugi three-component reaction for the synthesis of 2-arylamino-2-phenylacetamide has been developed using aldehydes, amines, and isocyanides in water. The synthesized 2-arylamino-2-phenylacetamides were efficiently converted into α-amino acid via acidic hydrolysis.
Nanoparticle catalyzed reaction (NPCR): ZnO-NP catalyzed Ugi-reaction in aqueous medium
作者:Atul Kumar、Deepti Saxena、Maneesh Kumar Gupta
DOI:10.1039/c3gc41101j
日期:——
The first ZnO-NP catalyzed Ugi type three-component (AB2C) reaction has been developed for the synthesis of 2-arylamino-2-phenylacetimidamide from an aldehyde, amine and isocyanide in aqueousmedia. This nanoparticle catalysed reaction (NPCR) is high yielding and has good atom economy as well as atom efficiency. The synthesized phenylacetimidamide yielded 2-amino-2-phenylacetamide on hydrolysis with