A Facile, One-Pot Procedure for Forming Diarylimines from Nitroarenes and Benzaldehydes
作者:Thomas Hughes、Andrew Korich
DOI:10.1055/s-2007-986668
日期:2007.10
An intermolecular reductive Schiff base formation from nitroarenes and benzaldehydes to yield diarylimines is carried out in the presence of iron powder and dilute acid. This process is tolerant of an array of functional groups and often proceeds quantitatively with no need for purification.
reaction sequence a primary amine is formed in situ from the corresponding nitro compound. Reversible condensation with aldehydes forms the respective imines, which are finally reduced to the desired secondary amine. This synthesis of secondary amines is atom‐economical and environmentally attractive using cheap and readily available organic compounds as starting materials.
General and selective reductive amination of carbonyl compounds using a core–shell structured Co<sub>3</sub>O<sub>4</sub>/NGr@C catalyst
作者:Tobias Stemmler、Felix A. Westerhaus、Annette-Enrica Surkus、Marga-Martina Pohl、Kathrin Junge、Matthias Beller
DOI:10.1039/c4gc00536h
日期:——
The application of heterogenized non-noble metal-based catalysts in selective catalytic hydrogenation processes is still challenging. In this respect, the preparation of a well-defined cobalt-based catalyst was investigated by immobilization of the corresponding cobalt(II)-phenanthroline-chelate on Vulcan XC72R carbon powder. The formed coreâshell structured cobalt/cobalt oxide nanocomposites are encapsulated by nitrogen-enriched graphene layers. This promising cheap heterogeneous catalyst allows for an efficient domino reductive amination of carbonyl compounds with nitroarenes.
Direct one-pot reductive imination of nitroarenes using aldehydes and carbon monoxide by titania supported gold nanoparticles at room temperature
作者:Jun Huang、Lei Yu、Lin He、Yong-Mei Liu、Yong Cao、Kang-Nian Fan
DOI:10.1039/c1gc15307b
日期:——
The direct one-pot reductive imination of nitroarenes with various aldehydes by a titania supportedgoldcatalyst at room temperature using CO/H2O as a reducing agent is illustrated. This method is simple, economic, general and environmentally benign, thus resulting in practical advantages for the synthesis of imines and their derivatives.