Carbonylative Coupling of Alkyl Zinc Reagents with Benzyl Bromides Catalyzed by a Nickel/NN
<sub>2</sub>
Pincer Ligand Complex
作者:Thomas L. Andersen、Aske S. Donslund、Karoline T. Neumann、Troels Skrydstrup
DOI:10.1002/anie.201710089
日期:2018.1.15
An efficient catalytic protocol for the three‐component assembly of benzyl bromides, carbon monoxide, and alkyl zinc reagents to give benzyl alkyl ketones is described, and represents the first nickel‐catalyzed carbonylative coupling of two sp3‐carbon fragments. The method, which relies on the application of nickelcomplexed with an NN2‐type pincer ligand and a controlled release of CO gas from a solid
The title reaction conveniently furnishes, as the sole or main products, alpha-(p-tolylhydrazono)ketones or their N-methylderivatives (H+ or Mel quenching of the final mixture, respectively). Although the method fails with ketones having a secondary alkyl group bonded to the carbonyl, yields are otherwise more than satisfactory and particular interest is attached to the hydrazonylation of the methyl group in methyl ketones.
Ramart-Lucas; Guerlain, Bulletin de la Societe Chimique de France, 1931, vol. <4> 49, p. 1860,1867