Stereoselective Epoxidation and Bromoalkoxylation with 3-Ylidenepyrazine-2,5-diones

Annett Bartels; Peter G. Jones; Jürgen Liebscher

doi:10.1055/s-2003-36259

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Stereoselective Epoxidation and Bromoalkoxylation with 3-Ylidenepyrazine-2,5-diones

Annett Bartels^a, Peter G. Jones^b, Jürgen Liebscher*^a
^a Institut für Chemie, Humboldt-Universität Berlin, 12489 Berlin, Germany
Fax: +49(30)20937552; e-Mail: liebscher@chemie.hu-berlin.de;
^b Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany

Abstract

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Abstract

3-Ylidenepyrazine-2,5-diones 1 were stereoselectively epoxidsed by dimethyldioxirane giving access to spirooxiranes 2 and diols 3. Bromohydroxylation and bromoalkoxylation of 3-ylidenepyrazine-2,5-diones 1 produced high yields of optically active 3-(1-bromoalkyl)pyrazine-2,5-diones 4 with a 3-hydroxy or 3-alkoxy function, respectively. Whereas direct hydrogenation of epoxides 2 afforded epimeric mixtures of 3-(1-hydroxyalkyl)pyrazine-2,5-diones 5 and 6, the highly stereoselective transformation into 5 was possible by primary acid cleavage of the oxirane ring followed by hydrogenation of the resulting keto-enol mixtures 7/8.

Key words

epoxidation - pyrazine-2,5-diones - hydrogenations - amino acid derivatives

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Complete crystallographic data (excluding structure factors) have been deposited at the Cambridge Crystallographic Data Centre under the number CCDC-187708. Copies can be obtained free of charge from CCDC, 12 Union Road, Cambridge CB2 1EZ, UK [Fax: Int. +44(1223)336033; e-mail: deposit@ccdc.cam.ac.uk].