Process for preparing hydroxyflavan compounds

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

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C07D31160, C07D31164

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active

056987170

ABSTRACT:
Described herein is a process for preparing a hydroxyflavan compound which comprises reacting a polyhydric phenol compound represented by formula(2): ##STR1## wherein at least one of W, X, Y and Z is hydroxy; with a ketone in the presence of (i)an acid catalyst and (ii)water and/or a seed crystal, using an organic solvent which is insoluble in water, procuces the hydroxyflavan compounds in high yield and with high selectivity while maintaining high conversion of the polyhydric phenol.

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