A Reusable Co Catalyst for the Selective Hydrogenation of Functionalized Nitroarenes and the Direct Synthesis of Imines and Benzimidazoles from Nitroarenes and Aldehydes
作者:Tobias Schwob、Rhett Kempe
DOI:10.1002/anie.201608321
日期:2016.11.21
presence of highly hydrogenation‐sensitive functional groups, as well as the direct synthesis of imines from nitroarenes and aldehydes or ketones in the presence of such substituents. Furthermore, we introduce the first base‐metal‐mediated direct synthesis of benzimidazolesfrom nitroarenes and aldehydes. Functional groups that are easy to hydrogenate are again well tolerated.
Combined Pd/C and Montmorillonite Catalysis for One-Pot Synthesis of Benzimidazoles
作者:Nicholas A. Weires、Jared Boster、Jakob Magolan
DOI:10.1002/ejoc.201201101
日期:2012.10.22
series of nineteen benzimidazoles are prepared from ortho-nitroanilines via one-pot transfer hydrogenation, condensation, and dehydrogenation enabled by the concurrent use of two heterogeneous catalysts: montmorillonite-K10 and Pd/C. This strategy is further employed to accomplish a five-step, three-component synthesis of an antifungal benzimidazoquinazoline using a simple one-pot procedure.
The Direct Synthesis of Imines, Benzimidazoles and Quinoxalines from Nitroarenes and Carbonyl Compounds by Selective Nitroarene Hydrogenation Employing a Reusable Iron Catalyst
作者:Christoph Bäumler、Rhett Kempe
DOI:10.1002/chem.201801525
日期:2018.6.26
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 directiron‐catalyzed synthesis of imines and benzimidazoles from nitroarenes and aldehydes becomes feasible. In addition, we introduce the directsynthesis of quinoxalines from nitroarenes and diketones