The three-componentreaction between 4-hydroxycoumarin, aromatic aldehydes and amides catalysed by p-toluenesulfonic acid in solvent-free conditions provided a simple and efficientone-pot route for the synthesis of 3-(α-amidobenzyl)-4-hydroxycoumarin derivatives in excellent yields.
One-pot, three-component reaction between aryl aldehydes, 4-hydroxycoumarin, and acetonitrile in the presence of chlorosulfonic acid affords 3-[(acetylamino)(aryl)methyl]-4-hydroxycoumarins in excellent yields.
P<sub>2</sub>O<sub>5</sub>-Hexamethyldisiloxane (HMDS): An Efficient System to Induce the Three-Component Reaction of Enolic Systems, Aromatic Aldehydes, and Acetonitrile
Three-component reaction of an enolizable compound, such as acetophenone, methyl acetoacetate, 4-hydroxycoumarin, 2-naphthol, or 3-hydroxy-2-naphthoic acid; an aromatic aldehyde, and acetonitrile induced by phosphorus pentoxide and hexamethyldisiloxane leads to 2-acetylamino ketones, methyl 3-(acetylamino aryl methyl)-3-oxobutanoates, 3-(acetylamino aryl methyl)-4-hydroxycoumarins, 1-(acetylamino aryl methyl)-2-naphthols, or 4-(acetylamino aryl methyl)-3-hydroxy-2-naphthoic acids in excellent yields.