Alkoxide-catalyzed ring expansion of 1,3-cyclobutanediones with aldehydes
2021
Yamazaki, Mizuki | Yoshimura, Tomoyuki | Matsuo, Jun-ichi
1,3-Cyclobutanediones (dialkyl ketene dimer) reacted with various aromatic aldehydes to give six-membered cyclic β-keto esters by using a catalytic amount of potassium ethoxide. Effects of alkoxide catalysts and spiro cyclic groups at the 2,4-positions of 1,3-cyclobutanediones were investigated.
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