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  • Title: Multistep microwave-assisted divergent synthesis of indolo-fused pyrazino-/diazepinoquinoxalinones on PEG support.
    Author: Lai JJ, Salunke DB, Sun CM.
    Journal: Org Lett; 2010 May 21; 12(10):2174-7. PubMed ID: 20420382.
    Abstract:
    Synthesis of amino acid and indoline-substituted dinitrobenzene on a soluble polymer support (PEG) and its further reductive double-ring closure to afford structurally diverse indolo-fused pyrazino-/diazepinoquinoxalinones is described. Traceless synthesis of quinoxalinones coupled with application of the Pictet-Spengler-type condensation reaction furnished these novel scaffolds. These hitherto novel heterocycles are synthesized in shorter times under microwave irradiation conditions in comparison with that of classical reaction conditions.
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