Mai M El-Ghonemy

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3-Acetyl-4-hydroxycoumarin (2) was reacted with some aldehydes (4-chlorobenzaldehyde, 4-bromobenzaldehyde, 5-methylfurfural) to afford the chalcones (3a-c). Cyclization of these chalcones with malononitrile in the presence of ammonium acetate afforded pyridine carbonitriles (4a-c), while the cyclization reaction of chalcones (3a-c) with ethyl cyanoacetate(More)
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