Abstract
p-Toluenesulfonic acid monohydrate (p-TsOH·H2O) is a highly effective and efficient catalyst for the one-pot multicomponent coupling of aldehydes, amines, and β-ketoesters in EtOH at ambient temperature to give highly functionalized piperidines in high yields. This one-pot reaction has some important advantages such as the easy workup procedure, simple and readily available precursors, nontoxic and inexpensive catalyst, and good to high yields.
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