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Direct synthesis of hydroxyflavanones from appropriately substituted acetophenones and benzaldehydes was achieved in the presence of boric acid, silica gel and piperidine. The formation of flavanones presumably involved the reaction between the acetophenone-boric acid complex (1) and the piperidinoaldehyde adduct (2) to yield the piperidino ketone (3). Elimination of piperidine from 3 gave the chalcone...
Polyhydroxyflavanones were synthesized in a one-step process by reacting the appropriate hydroxyacetophenones and hydroxybenzaldehydes in the presence of boric acid, in a mixed solvent system.
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