A Facile and Practical p-Toluenesulfonic Acid Catalyzed Route to Dicoumarols Containing an Aroyl group
New and known dicoumarols may be efficiently synthesized employing p-toluenesulfonic acid (p-TSA) as a solid acid catalyst from the reaction of 4-hydroxycoumarin with aryl glyoxal in water. This method offers direct access to structurally diverse coumarin derivatives in moderate to good yields (up to 65%). A total of five new compounds were synthesized.
KEYWORDS Dicoumarol, p-toluenesulfonic acid, aryl glyoxal, 4-hydroxycoumarin.
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