Ammonium Chloride Promoted Ugi Four-Component, Five-Center Reaction of α-Substituted α-Isocyano Acetic Acid: A Strong Solvent Effect
作者:Damien Bonne、Mouloud Dekhane、Jieping Zhu
DOI:10.1021/ol0479388
日期:2004.12.1
developed for the multicomponent synthesis of di- and tetrapeptide (7) based on the unique reactivity of alpha-isocyano acetic acid (4 and its alpha-substituted derivatives) by an Ugi four-component, five-center reaction. Simply mixing 4, a carbonyl compound (aldehyde or ketone, 8), and a secondary amine (9) (ratio: 1:1:2) in toluene in the presence of 1.5 equiv of ammonium chloride afforded the desired