α-Acyloxy carboxamides were easily assessed in one step by the multicomponent reaction between carboxylic acids, aldehydes and C-isocyanides (Passerini reaction) using ionic liquids or polyethyleneglycol (PEG 400) as green reaction media.
The formation of α-acyloxy carboxamides from a carboxylic acid, an aldehyde and an isocyanide (Passerini reaction) was investigated in aqueous solution in the presence of different types of surfactants.
Brønsted Acidity of Substrates Influences the Outcome of Passerini Three-Component Reactions
作者:Babajide O. Okandeji、Jason K. Sello
DOI:10.1021/jo900831n
日期:2009.7.17
Passerini three-component reactions of aldehydes, isocyanides, and strong carboxylic acids (i.e., pK(a) < 2) yield alpha-acyloxycarboxamides and/or alpha-acylaminocarbox amides, the characteristic products of Ugi four-component reactions. We propose that alpha-acylaminocarboxamide formation with these substrates is a consequence of in situ Bronsted acid-catalyzed reaction of the isocyanide and aldehyde to yield an imine that participates in an Ugi-type reaction. The apparent transfer of the isocyanide alpha-carbon to protic solvents as a formyl group during imine formation is indicative of new isocyanide reactivity.
Microdroplet Chemistry Accelerating a Three-Component Passerini Reaction for α-Acyloxy Carboxamide Synthesis
作者:Yikang Wu、Heyong Cheng、Jiayao Li、Jinhua Liu、Jiannan Sun
DOI:10.1021/acs.joc.3c01206
日期:2023.8.4
pharmacological activities. Traditional three-componentPasserinireactions among isocyanates, aldehydes/ketones, and carboxylic acids for affording α-acyloxy carboxamides suffer from several drawbacks such as long reaction time, high reaction temperature, special reaction devices, etc. Herein, we developed a high-efficiency microdroplet method for accelerating the Passerinireactions by 3 orders of magnitude by