Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 7, Issue 7, Pages 960-966Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qo01507h
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- European Research Council (ERC) [683150]
- European Research Council (ERC) [683150] Funding Source: European Research Council (ERC)
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The sequential combination of the facile substitution of organohalides with the nitrile function and the hydroboration of the resultant nitriles enables a straight-forward access to synthetically versatile primary amines via a formal C-1 homologation. Several catalysts have been reported for the latter transformation, mostly with transition metal catalysts (Ti, Fe, Co, Ni, Zn, Ru, Mo). Very few main group metal catalysts have been demonstrated to show equal activity. This work reports an operationally facile hydroboration of nitriles at room temperature that operates under catalysis of the solid, stable, and inexpensive salt lithium hexamethyldisilazide, LiN(SiMe3)(2). The reaction displayed good tolerance of functional groups including F, Cl, Br, I, pyridyl, and thiophene substituents. Carbonyl derivatives readily reacted under the same conditions. Mechanistic studies were indicative of the catalytic role of lithium amidinate intermediates, the co-catalytic role of nitrile additives, and a reaction order of zero in borane.
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