Intramolecular borylation reaction catalyzed by Lewis acid: preparation of 1H-2,1-benzazaborole derivatives

Abstract

It has been found that 1H-2,1-benzazaboroles can be prepared by the interaction of substituted benzylaminochloroboranes with Al₂Cl₆ in CH₂Cl₂ at 0 °C, the ¹³C NMR spectroscopy data obtained being in favour of an electrophilic substitution mechanism involving formation of cationic complexes as reactive intermediates.