Abstract
AbstractA mild and efficient Knoevenagel‐Doebner reaction from malonic acid and a wide range of aldehydes was catalyzed by a catalytic system consisting of β‐alanine and 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU), affording the corresponding (E)‐α,β‐unsaturated carboxylic acids in good to excellent yields and with high stereoselectivity. The advantage of the method is that the reaction could proceed smoothly at ambient temperature so that it can tolerate a variety of functional groups and avoid unnecessary side reactions.
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