Acylation of amines is an important and routinely utilized method for the protection of amino group transformation in organic synthesis. Despite a number of precedents, new efficient methodologies for acylation are still in demand. A variety of catalysts developed for acylation include Lewis acids such as metal halides, [ 1 1. (a) Ahmad , S. ; Iqbal , J. Cobalt(II) chloride catalysed coupling of thiols and anhydrides: A new and efficient synthesis of thiol esters . Tetrahedron Lett . ...