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.
Three-Component Reaction between 3-Hydroxy-2-Naphthoic Acid, Aromatic Aldehydes and Acetonitrile in the Presence of Chlorosulfonic Acid: Synthesis of 4-(Acetylaminoarylmethyl)-3-Hydroxy-2-Naphthoic Acid
The one-pot, three-component reaction between 3-hydroxy-2-naphthoic acid, aromatic aldehydes and acetonitrile in the presence of chlorosulfonic acid leads to 4-(acetylaminoarylmethyl)-3-hydroxy-2-naphthoic acids in excellent yields.