Tetramate derivatives by chemoselective Dieckmann ring closure ofallo-phenylserines, and their antibacterial activity

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Abstract
A general route which provides direct access to substituted bicyclic tetramates, making use of Dieckmann cyclisation of oxazolidines derivatives derived from allo-phenylserines, is reported. Of interest is the high level of diastereoselectivity observed for the N-acylation reaction of oxazolidines and the complete chemoselectivity of their ring closure in the Dieckmann cyclisation. Significantly, the sense of the chemoselectivity is different to earlier reported threo-phenylserine systems, showing the importance of steric bulk around the bicyclic ring system. The derived C7-carboxamidotetramates, but not C7-acyl systems, exhibited potent antibacterial activity against MRSA, with the most active compounds exhibiting well-defined physicochemical and structure-activity properties. This work clearly demonstrates that densely functionalised tetramates are both readily available and may exhibit high levels of antibacterial activity.
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  • Engineering and Physical Sciences Research Council

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