Abstract
An Ag(I)-catalyzed intramolecular cyclization of ethyl o-hydroxyphenylethynylphosphinate to phosphachromones has been developed with high regioselectivity and good yields. The present reaction represents the first example of intramolecular addition of phenol to 1-alkynylphosphonates, which provides an approach to synthesize new phosphorus heterocycles. The resulting phosphachromones could have potential bioactivities.
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