VERFAHREN FUER DIE SYNTHESE VON ATHOCYANIDINEN UND NEUES ZWISCHENPRODUKT.

摘要

A novel procedure is provided for producing anthocyanidines by reacting 2,4-di-O-protected derivative phloroglucinaldehyde of formula VII wherein Pg<1> and Pg<2> each represents an O-protecting group with a compound of formula V wherein in Ar represents optionally substituted aryl and Pg<3> represents a O-protecting group. Protecting groups in the resulting condensation product are optionally converted to free hydroxyl groups. The invention further provides a novel method for producing phloroglucinaldehyde derivatives of formula VII as well as a novel procedure for producing phloroglucinaldehyde itself.