Selective hydrogenolysis of C-CN bonds can allow chemists to take advantage of ortho-directing ability, alpha-C-H acidity and electron withdrawing ability of the cyano group for synthetic manipulations. We have discovered hydrogenolysis of aryl and aliphatic cyanides under just 1 bar of hydrogen by using a nickel catalyst. This protocol was applied in the aryl cyanide directed functionalization reaction
Pinacolborane as the Boron Source in Nitrogen-Directed Borylations of Aromatic <i>N</i>,<i>N</i>-Dimethylhydrazones
作者:Rocío López-Rodríguez、Abel Ros、Rosario Fernández、José M. Lassaletta
DOI:10.1021/jo301965v
日期:2012.11.2
A mild procedure for the Ir(III)-catalyzed nitrogen-directed ortho borylation of aromatic N,N-dialkylhydrazones using pinacolborane as the boron source has been developed. The methodology relies on a modified, hemilabile N,N ligand built on a 4-N,N-dimethylaminopyridine unit that provides high reactivity while maintaining exclusive ortho-selectivity. This procedure can be combined with Suzuki–Miyaura