Studies Toward the Synthesis of Natural and Unnatural Dienediynes. Part 2. A Practical Approach to Functionalized Cyclopentenones.-A new practical procedure to synthesize functionalized cyclopentenones (VIII), useful intermediates for the preparation of both functionalized neocarzinostatins and natural product chromophores, that relies on a new base-mediated isomerization of pyranones (VII) to dihydroxylated cyclopentenones is given. -(CADDICK, S.; KHAN, S.; FROST, L. M.; SMITH, N. J.; CHEUNG, S.; PAIRAUDEAU, G.; Tetrahedron 56 (2000) 45, 8953-8958; Chem. Lab., Cent. Biomol. Des. Drug Dev., Univ. Sussex, Brighton BN1 9QJ, UK; EN)
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