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New Three-Component Reaction:  Novel Formation of a Seven-Membered Ring by the Unexpected Reaction at the γ-Position of the β-Keto Ester

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posted on 26.04.2007, 00:00 by Hiromichi Fujioka, Kenichi Murai, Ozora Kubo, Yusuke Ohba, Yasuyuki Kita
The novel three-component reaction of aromatic aldehydes, ethylenediamine, and β-keto esters is described. In this reaction, β-keto esters react at the γ-position which is generally unreactive to produce the seven-membered ring compounds. Products have secondary amines and β-enamino esters, which can serve in further functionalizations to produce molecular diversity.