Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 36, Pages 8989-8993Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801525
Keywords
benzimidazoles; imines; hydrogenation; iron; quinoxalines
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Funding
- Deutsche Forschungsgemeinschaft [SFB 840]
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The replacement of noble metals by earth abundant metals is a desirable aim in catalysis and a possible way of conserving rare elements. The replacement is especially attractive if novel selectivity patterns are observed permitting the development of novel coupling reactions. Herein, we report on a novel, robust and reusable iron catalyst, which permits the selective hydrogenation of nitroarenes in the presence of hydrogenation-sensitive functional groups. Based on the selectivity pattern observed, the direct iron-catalyzed synthesis of imines and benzimidazoles from nitroarenes and aldehydes becomes feasible. In addition, we introduce the direct synthesis of quinoxalines from nitroarenes and diketones applying our catalyst.
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