Abstract
• The first heterogeneous Au-catalyzed oxidation of alkyne to 1,2-dicarbonyl is reported. • MCM-41-Ph 2 P-AuNTf 2 exhibits a comparable catalytic activity to Ph 3 PAuNTf 2 . • The reactions generate a variety of 1,2-dicarbonyls in good to excellent yields. • The gold catalyst can be reused more than 7 times with almost consistent activity. The heterogeneous gold(I)-catalyzed oxidation of alkynes was achieved by using 2,3-dichloropyridine N -oxide as oxidant and MCM-41-anchored diphenylphosphine-gold(I) complex [MCM-41-Ph 2 P-AuNTf 2 ] as the catalyst under mild and acid-free conditions, yielding diverse 1,2-dicarbonyls in good to excellent yields with easy recycling of the gold catalyst. The developed method is applicable to a wide variety of alkynes including internal or terminal alkynes, alkynyl ethers or thioethers and ynamides, and can tolerate a wide range of functional groups.
Published Version
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