Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 350, Issue 9, Pages 1248-1252Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200700516
Keywords
alkynes; cyclization; dibenzo[b,d]pyranones; enediynes; heterocycles; palladium
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Treatment of methyl 2-[6-substituted-3(Z)-hexen-1,5-diynyl]benzoates (1) with five mol% of palladium chloride and three equivalents of cupric chloride in refluxing acetonitrile gave dibenzo[b,d]pyran-6-ones (2) in modest to good yields.
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