Iodine is shown to be an efficient catalyst for a one-step, three-component aza-Friedel-Crafts reaction of activated arenes or heteroarenes with benzyl or tert-butyl carbamates in combination with a wide variety of aldehydes in toluene under 'open-flask' and mild conditions. In the presence of 5 mol % of iodine in toluene at room temperature, the reaction gives the corresponding N-CBz or N-Boc protected a-branched amines, selectively, in good to excellent yields. (C) 2012 Published by Elsevier Ltd.
Green synthesis and anti-inflammatory studies of a series of 1,1-bis(heteroaryl)alkane derivatives
an efficient catalyst for a double Friedel–Crafts reaction of various heteroarenes, i.e. 2-methylfuran, 2-ethylfuran, 2-methylthiophene, pyrrole, N-methylpyrrole and indole, using aldehydes as alkylating agents under “open-flask” conditions with toluene or water as the reaction media. In the presence of 10 mol% iodine in toluene at room temperature, both aliphatic and aromatic aldehydes reacted smoothly