oa South African Journal of Chemistry - A facile and practical p-toluenesulfonic acid catalyzed route to dicoumarols containing an aroyl group : research article
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.
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