Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 41, Pages 9624-9628Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902213
Keywords
allenes; cross-coupling; gold catalysis; heterocycles; oxidative addition
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Funding
- China Scholarship Council (CSC)
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A gold(I)-catalyzed cascade cyclization-alkynylation of allenoates using alkynyl bromide to generate beta-alkynyl-gamma-butenolides was investigated. Whereas alkynyl iodides afforded significant amounts of the homo-coupling of two lactone units, alkynyl bromides led to a selective reaction, and a broad functional group tolerance was observed. Under the optimized reaction conditions, it was possible to directly synthesize a large range of beta-alkynyl-gamma-butenolides in moderate to good yields without the need for any external oxidant.
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