Journal
SYNLETT
Volume -, Issue 17, Pages 2661-2663Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-2005-917094
Keywords
bicyclic compounds; oxidations; benzotropolones; quinones; theaflavins
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The coupling of 5-methylpyrogallol (6) with 4-methyl-o-quinone (7) in an aprotic solvent (CH2Cl2) efficiently afforded a key intermediate 8 having a bicyclo[3.2.1] ring whose structure had been proposed for fifty years. Subsequent ring-opening of 8 by the addition of H2O, air oxidation and decarboxylation produced the benzotropolone 10 in good yield.
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