ULTRASOUND ACCELERATED REDUCTIVE COUPLING OF IMINE OR IMINIUM ION GENERATED IN 5 M LITHIUM PERCHLORATE SOLUTION BY LITHIUM METAL

A novel one-pot reductive coupling of imine or iminium ion generated in the concentrated ethereal lithium perchlorate solution was achieved in the presence of lithium metal. The yield of the reaction depends on the reactivity preformed imine or iminium ion. Diamines were formed with high diastereoselectivity in some cases in about 5 h. The reaction time was doubled without the use of ultrasound acceleration.