Total syntheses of the furanosesquiterpenes crassifolone and dihydrocrassifolone via an Au(I)-catalysed intramolecular Michael addition reaction
The racemic modifications of title natural products 1 and 2 have been synthesised for the first time. The key step was the Au(i)-catalysed conversion of the furanyl-substituted ynone 13 into the annulated furan 14.
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