Abstract
An analogue of the Streptomyces metabolite JBIR-141, featuring a delicate N-nitrosohydroxylamine, a 3-acyltetramic acid, and an oxazoline, was synthesized by a convergent strategy from l-alanine, l-threonine, and l-glutamic acid. Key steps were the cyclization of an Ala-Thr derivative to give the oxazoline, a Dieckmann condensation affording the 3-acyltetramic acid, and the N-nitrosation of a hydroxylamino derivative of glutamic acid. An adequate protecting group strategy was established for coupling the three building blocks.
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