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9.9.1.3.1.1.8 Method 8: Cyclization of 1,4-Dihydroxyalk-2-ynes

DOI: 10.1055/sos-SD-009-00244

König, B.Science of Synthesis, (20019210.

1,4-Dihydroxyalk-2-ynes 133 are suitable starting materials for the synthesis of 2,5-disubstituted furans 134 (Scheme 45). Either isomerization to alkane-1,4-diones followed by cyclization, or a palladium-catalyzed isomerizationdehydration reaction leads to furans.[‌240‌,‌241‌]

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