Hydrogen-free reductive amination using iron pentacarbonyl as a reducing agent
作者:Oleg I. Afanasyev、Dmitry L. Usanov、Denis Chusov
DOI:10.1039/c7ob02795h
日期:——
We developed solvent-free reductiveaminationwithout an externalhydrogensource using iron pentacarbonyl as a reducing agent. Neither a catalyst nor any other additives were employed. Various types of substrates are suitable for the reaction, including those with low reactivity, e.g. benzophenone. Among others, the protocol tolerates bromo-, cyano-, benzyloxy-, pyrimidyl and styryl moieties.
A general procedure for the reductive coupling of N-tosylhydrazones with amines in the presence of Cu(acac)2 and Cs2CO3 has been developed. The protocol is very effective and chemoselective with various primary and secondary aliphatic amines, aminoalcohols as well as azole derivatives to give α-branched amines in good yields.
Al2O3-supported Pd nanoclusters with an average particle size of 1.8 nm act as a reusable catalyst for the selective cross-coupling of amines. The reaction is a structure-sensitive reaction, demanding coordinatively unsaturated Pd atoms on a metallic nanocluster. The support also affects the activity, an amphoteric oxide (Al2O3) is most effective.
Cobalt(II) Phthalocyanine-Catalyzed Highly Chemoselective Reductive Amination of Carbonyl Compounds in a Green Solvent
作者:Vishal Kumar、Upendra Sharma、Praveen K. Verma、Neeraj Kumar、Bikram Singh
DOI:10.1002/adsc.201100645
日期:2012.3.16
Cobalt phthalocyanine has been employed for the highlychemoselectivereductiveamination of aldehydes and ketones in ethanol as a greensolvent. A large range of functional groups such as nitro, acid, amide, ester, nitrile, halogen, lactone, methoxy, hydroxy, alkene, N‐benzyl, O‐benzyl and heterocyclic rings were well tolerated under the present reaction conditions.