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
Synthesis of Aliphatic Carboxamides Mediated by Nickel NN<sub>2</sub>
-Pincer Complexes and Adaptation to Carbon-Isotope Labeling
作者:Karoline T. Neumann、Aske S. Donslund、Thomas L. Andersen、Dennis U. Nielsen、Troels Skrydstrup
DOI:10.1002/chem.201804077
日期:2018.10.9
reagents, stoichiometric carbonmonoxide and amines is described for the first time, which can be adapted to late‐stage carbon‐isotope labeling. This work expands the scope of the highly established palladium‐promoted version of the reaction, by allowing carbon‐sp3 fragments to take part in the three‐component reaction. Finally, the results obtained show a remarkable effect of the pincer ligand for
首次介绍了使用NN 2钳形镍配合物,烷基锌试剂,化学计量一氧化碳和胺开发镍介导的氨基羰基化反应的方法,该方法可用于后期碳同位素标记。通过允许碳sp 3片段参与三组分反应,这项工作扩展了高度确立的钯促进反应的范围。最后,获得的结果显示了钳型配体在用胺进行的还原消除步骤中的显着效果,随后进行了13 C NMR光谱研究。
Carbon Isotope Labeling Strategy for β-Amino Acid Derivatives via Carbonylation of Azanickellacycles
作者:Anne K. Ravn、Maria B. T. Vilstrup、Peter Noerby、Dennis U. Nielsen、Kim Daasbjerg、Troels Skrydstrup
DOI:10.1021/jacs.9b05934
日期:2019.7.31
complexes. Upon subjection to a range of C-, N-, O-, and S-nucleophiles, 13C-labeled β-amino acids and derivatives thereof, as well as β-amino ketones, could be rapidly accessed. The methodology proved highly adaptable for the synthesis of the anti-diabetic drug, sitagliptin, with a single carbon isotopelabel.