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Chemoselective Hydrogenation of Nitroarenes Catalyzed by Molybdenum Sulphide Clusters
Author(s) -
Pedrajas Elena,
Sorribes Iván,
Gushchin Artem L.,
Laricheva Yuliya A.,
Junge Kathrin,
Beller Matthias,
Llusar Rosa
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601496
Subject(s) - aniline , chemistry , catalysis , nitrobenzene , yield (engineering) , thiourea , chemoselectivity , molybdenum , medicinal chemistry , ligand (biochemistry) , selectivity , combinatorial chemistry , organic chemistry , biochemistry , materials science , receptor , metallurgy
Herein, we describe an atom efficient and general protocol for the chemoselective hydrogenation of nitroarenes to anilines catalyzed by well‐defined diimino and diamino cubane‐type Mo 3 S 4 clusters. The novel diimino [Mo 3 S 4 Cl 3 (dnbpy) 3 ] + ([ 5 ] + ) (dnbpy=4,4′‐dinonyl‐2,2′‐dipyridyl, L1 ) trinuclear complex was synthesized in high yields by simple ligand substitution reactions starting from the thiourea (tu) [Mo 3 S 4 (tu) 8 (H 2 O)]Cl 4 ⋅ 4 H 2 O ( 3 ) precursor. This strategy has also been successfully adapted for the isolation of the diamino [Mo 3 S 4 Cl 3 (dmen) 3 ](BF 4 ) ([ 6 ](BF 4 )), (dmen= N , N ′‐dimethylethylenediamine) salt. Applying these catalysts, high selectivity in the hydrogenation of functionalized nitroarenes has been accomplished. Over thirty anilines bearing synthetically functional groups have been synthesized in 70 to 99 % yield. Notably, the integrity of the cluster core is preserved during catalysis. Based on kinetic studies on the hydrogenation of nitrobenzene and other potential reaction intermediates, the direct reduction to aniline is the preferential route.