Journal
ORGANIC LETTERS
Volume 15, Issue 1, Pages 26-29Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol3029274
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Funding
- National Research Foundation of Korea [2012-0001245]
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Tandem gold-catalyzed addition of alkynyl phosphonic acid monoethyl esters to terminal alkynes and cyclization were developed for the synthesis of 4,6-disubstituted phosphorus 2-pyrones in one reaction vessel based on the concept of sequential alkyne activation. Alkynyl enol phosphonates were selectively obtained through the gold-catalyzed addition reaction in the presence of a catalytic amount of triethylamine. Also, gold-catalyzed cyclization of alkynyl enol phosphonates was successful in giving a variety of 4,6-disubstituted phosphorus 2-pyrones.
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