Studies on Thiopeptide Antibiotics: Synthesis of an Oxazole-Thiazole-Pyridine Fragment related to Promothiocin A

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Abstract
Promothiocin A 1, isolated from Streptomyces sp. SF2741, is a member of the thiopeptide family of antibiotics. These antibiotics, which inhibit protein synthesis in bacteria and induce the expression of various genes (of unknown function), are characterised by their complex structure in which an array of heterocyclic rings is incorporated into a macrocyclic peptide framework. Despite the fascinating biological activity of the thiopeptide antibiotics, very little synthetic work has been carried out to date, although the synthesis of the pyridine fragments of the micrococcins, sulfomycin and nosiheptide has been addressed recently, as has the construction of some related pyridines. In continuation of our interest in the synthesis of heterocyclic natural products, we now report the synthesis of the oxazole-thiazole-pyridine 2, which contains the required functionality for elaboration into promothiocin A 1.

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