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卷 43, 期 49, 页码 8853-8857出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(02)02207-4
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We herein report the efficient syntheses of biologically active 4-alkenyl- and 4-alkynyl-6-methyl-2-pyrones using Pd-catalysed coupling procedures. A palladium on carbon/triphenylphosphine combination is shown to be the most effective catalyst for Sonogashira cross-coupling of several terminal acetylenes with 4-bromo-6-methyl-2-pyrone in yields of up to 95%. (C) 2002 Elsevier Science Ltd. All rights reserved.
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