Patent ID: 6939985

Claim:
A process for preparing aryl boronic acid esters comprising reacting an aromatic ring compound having a halogen substituent or other substituent which undergoes substitution with a diboronic acid ester and a substituent selected from the group consisting of hydroxy, amino, imino, acetyleno, carboxy, carboxylato, carboximidyl, sulfo, sulfinyl, sulfinimidyl, sulfinohydroximyl, sulfonimidyl, sulfondiimidyl, sulfonohydroximyl, sulfamyl, phosphinyl, phosphinimidyl, phosphonyl, dihydroxyphosphanyl, hydroxyphosphanyl, phosphono, phosphonato, hydrohydroxyphosphoryl, allophanyl, guanidino, hydantoyl, ureido and ureylene, with a diboronic acid ester in the presence of a Group III metal catalyst and a base which catalyses, promotes or assists the reaction, said reaction proceeding by a substitution reaction between said diboronic acid ester and said halogen or other substituent of the aromatic ring compound.