4-Nitrobenzaldehyde → 2,2-Dimethyl-5-[(4-nitrophenyl)methylidene]-1,3-dioxane-4,6-dione

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Reaction Steps

To 4-nitrobenzaldehyde (15.1 g) were added a toluene (180 mL) solution, Meldrum's acid (14.4 g), piperidine (300 μL) and acetic acid (300 μL) at room temperature, and the mixture was stirred for 5 hr. Insoluble material was collected by filtration, and the obtained solid was washed with ethyl acetate (80 mL). The resulting precipitate was collected by filtration to give the title compound (19.3 g) as a pale-yellow solid.

Provenance & Evidence