Abstract
A concise synthesis of 2,3,4,5-tetrasubstituted tetrahydrofurans starting from furan via 7-oxabicyclo[2.2.1]hept-5-ene-2,3-diol (2,3-dihydroxy-7-oxanorbomene) derivatives is reported. The key step of these transformations was the sequence ring-opening metathesis-cross metathesis (ROM-CM) reactions of the oxabicyclic compounds in the presence of ethylene and using commercially available 2nd generation Hoveyda-Grubbs catalyst.
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