Abstract
β-Lactones, β-lactams and epoxides are privileged structural motifs found in both therapeutics and natural products. Herein we report several strategies for annulation of these motifs onto natural products that are not known to covalently modify their cellular targets. These strategies can facilitate identification of previously unidentified cellular targets or identify novel cellular targets of these natural products. The reported strategies include telescoped synthesis of β-lactones from allylic alcohols, nucleophile-catalyzed Michael aldol-β-lactonizations, and [2 + 2] β-lactam annulations with complex, commercially available alkene-containing natural products as substrates. A novel method for the tagging of phenolic natural products with epoxides is also reported.
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