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Synlett 2011(7): 1023-1027
DOI: 10.1055/s-0030-1259929
DOI: 10.1055/s-0030-1259929
LETTER
© Georg Thieme Verlag
Stuttgart ˙ New York
Palladium-Catalyzed Oxidation and Cyclization of Carbon-Carbon Triple Bonds in Fluorous Media Using Molecular Oxygen
Further Information
Received
16 November 2010
Publication Date:
29 March 2011 (online)
Publication History
Publication Date:
29 March 2011 (online)
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Abstract
An intriguing, facile, and efficient oxidation and cyclization of alkynes catalyzed by Pd(OAc)2 in a fluorous biphasic system of N,N-dimethylacetamide (DMA) and perfluorodecalin directly with molecular oxygen is described, which opens an efficient access to tetrasubstituted furans. Under the optimized conditions, intermolecular reaction between diverse alkynes provides the corresponding mixture of regioisomers with appreciable selectivity. Intramolecular oxidation and cyclization of alkynes are also successfully demonstrated. The reaction proceeds efficiently under mild conditions with atmospheric oxygen as the sole oxidant.
Key words
perfluorodecalin - molecular oxygen - alkynes - palladium-catalyzed - oxidation
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