In the last decade,the Richter reaction has elicited considerable interest among chemists for two reasons:1) the requirement to produce condensed heteroaromatic compounds with high biological activity,and 2) creation of convenient methods for introduction of alkyne groups into the aromatic ring,thereby making vic-alkynylaminoarenes accessible.The cycliza-tion of ortho-alkynylbenzenediazonium salts,discovered by Richter,has been applied to the preparation of 4-hydroxycinnoline derivatives (Eq.1).
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