In a pressure tube, a mixture of the N-heterocycle (1 equiv) and the aryl boronic acid (1 equiv) was dissolved in methanol. While stirring, triethylamine (5 equiv) and then cupric acetate (10% mol) was added. The mixture was refluxed for 20 hours in a pressure tube, venting with air every few hours. The crude reaction mixture was concentrated in vacuo and the residue purified via silica gel column chromatography.