Golden solution: A neutral solution of AuBr3, containing [AuBr2(OH)2]− in equilibrium with [AuBr3(OH)]− and [AuBr4]−, promotes the chemoselective hydrolysis of robust oximes into carbonyl compounds without racemization (see scheme). The food additive diacetyl acts as a NH2OH‐trapping agent, thus avoiding the formation of gold nanoparticles and allows the reaction to run catalytically.
Amine-Free Approach toward<i>N</i>-Toluenesulfonyl Amidine Construction: A Phosphite-Mediated Beckmann-Like Coupling of Oximes and<i>p</i>-Toluenesulfonyl Azide
作者:Lauren M. Fleury、Erin E. Wilson、Monika Vogt、Tiffany J. Fan、Allen G. Oliver、Brandon L. Ashfeld
DOI:10.1002/anie.201305141
日期:2013.10.25
Atom hopping: A chlorophosphite‐mediated Beckmann ligation of oximes and p‐toluenesulfonyl azide gives access to N‐sulfonyl phosphoramidines in good to excellent yields. The reaction proceeds under exceptionally mild conditions and constitutes a bioorthogonal approach toward amidines by avoiding the use of amines and transition‐metal catalysts. dmp‐ol=3,3‐dimethylpropanediol.
Directing Group in Decarboxylative Cross-Coupling: Copper-Catalyzed Site-Selective C–N Bond Formation from Nonactivated Aliphatic Carboxylic Acids
作者:Zhao-Jing Liu、Xi Lu、Guan Wang、Lei Li、Wei-Tao Jiang、Yu-Dong Wang、Bin Xiao、Yao Fu
DOI:10.1021/jacs.6b05788
日期:2016.8.3
Copper-catalyzed directed decarboxylative amination of nonactivated aliphatic carboxylic acids is described. This intramolecular C-N bond formation reaction provides efficient access to the synthesis of pyrrolidine and piperidine derivatives as well as the modification of complex natural products. Moreover, this reaction presents excellent site-selectivity in the C-N bond formation step through the
Catalytic Aerobic Oxidative Cleavage of Oximes, Tosylhydrazones and N,N-Dimethylhydrazones to Carbonyl Compounds
作者:Gonzalo Blay、Elisabeth Benach、Isabel Fernández、Sales Galletero、José R. Pedro、Rafael Ruiz
DOI:10.1055/s-2000-6347
日期:——
A new method for the aerobic oxidative cleavage of the C=N double bond of oximes and, tosyl- and N,N-dimethylhydrazones of ketones to yield their corresponding carbonyl compounds, with a Ni(II) complex catalyst, oxygen and pivalaldehyde has been developed.