Multiple On-Resin Olefin Metathesis to Form Ring-Expanded Analogues of the Lantibiotic Peptide, Lacticin 3147 A2

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Abstract

Chemical synthesis of lantibiotic analogues wherein monosulfide bridges are replaced with other groups can shed light on structure-activity relationships and generate variants that are resistant to aerobic oxidation and have better metabolic stability. This work describes the first complete synthesis of a carbocyclic lantibiotic analogue 2, using sequential on-resin ring-closing olefin metathesis and solution-phase peptide synthesis. The methodology described should find wide application for the preparation of rigidified peptidomimetics containing multiple carbocyclic rings. [structure: see text].

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