Abstract
Abstract Synthesis of a cyclic sulfide moiety ring B in peptide antibiotic nisin was successfully achieved by desulfurization from a corresponding disulfide peptide with tris(diethylamino)phosphine. The configuration on β-carbon atom of threo-3-methyl-d-cysteineresidue in the disulfide peptide was retained through the reaction to give a desired natural threo form of methyllanthionine.
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