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  • Synthesis of Furano[2,3-c]pyran-3-one andThieno[2,3-c]pyran-3-one Derivatives through the Coupling of3-Alkynyl-2-heteroaromatic Carboxaldehydes with FischerCarbene Complexes: Total Synthesis of a Baccharis-DerivedCadinene Derivative
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  • The coupling of Fischer carbene complexes with 3-alkynyl-2-heteroaromatic carboxaldehydederivatives has been examined. The reaction affords pyrones fused to furans or thiophenes in asingle step. The compounds are stable enough for isolation. If the carbene complex features a remotealkene substituent, a subsequent Diels−Alder reaction can occur. This reaction has been used asthe key step in the synthesis of a naturally occurring cadinene derivative.
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