In a one-pot reaction aromatic aldehydes, urethane or acetamide and a variety of ketones condense in the presence of catalytic amounts of boron trifluoride or p-toluenesulfonic acid to furnish substituted carbamates or amides in good yield.
XENKINA, T. V.;MOCHALIN, V. B., ZH. ORGAN. XIMII, 1983, 19, N 6, 1242-1245