Studies in the usnic acid series. II. The condensation of (+)-usnic acid with hydroxylamine

Abstract
The results of the reaction of usnic acid (1) with hydroxylamine are presented. Four products, two isomeric isoxazoles (2 and 4), a novel oxazocine structure (3), and Δ2,11-enaminousnic acid (5) were isolated and characterized. These data clarify the earlier published results in this area.

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