Abstract
AbstractA Brønsted acid‐catalyzed, transition metal‐free intramolecular 7‐endo hydroarylation reaction of 1,5‐diaryl‐1‐pentynes has been developed. The use of 1,1,1,3,3,3‐hexafluoro‐2‐propanol (HFIP) as a solvent was found to be critical for this process. Using the present methodology, we have accomplished the synthesis of KGP‐18, an analogue of the anticancer natural product combretastatin A4.magnified image
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