title: Ammonium chloride promoted Ugi four-component, five-center reaction of alpha-substituted alpha-isocyano acetic acid: a strong solvent effect.
abstract: [reaction: see text] Conditions have been 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 product in good to excellent yield as a mixture of two diastereomers.
authors.affiliation: Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Bonne
authors.forename: Mouloud
authors.initials: M
authors.lastname: Dekhane
authors.forename: Jieping
authors.initials: J
authors.lastname: Zhu