Selective Monomethylation of Amines with Methanol as the C
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作者:Geunho Choi、Soon Hyeok Hong
DOI:10.1002/anie.201801524
日期:2018.5.22
methanol as the methylating agent, which is a sustainable chemical feedstock. Kinetic control of the aliphatic amine monomethylation was achieved by using a readily available rutheniumcatalyst at an adequate temperature under hydrogen pressure. Various substrates including bio‐related molecules and pharmaceuticals were selectively monomethylated, demonstrating the general utility of the developed method
Photoinduced Nickel-Catalyzed Selective <i>N</i>-Demethylation of Trialkylamines Using C(sp<sup>2</sup>)–Bromides as HAT Reagents
作者:Xiao Zhang、Yangyang Shen、Tomislav Rovis
DOI:10.1021/jacs.2c12767
日期:2023.2.15
judicious protection of labile functional groups. Herein we report a mild, catalytic approach for the demethylation of trialkylamines by utilizing photoinduced nickel catalysis wherein C(sp2)–bromides serve as hydrogen-atomtransfer (HAT) reagents. This method achieves direct demethylation of trialkylamines with wide functional group compatibility, making it highly suitable for late-stage derivatization
AbstractThe palladium‐catalyzed ligand‐controlled arylation of α‐zincated acyclic amines, obtained by directed α‐lithiation and transmetalation, is described. Whereas PtBu3 gave rise to α‐arylated Boc‐protected amines, more flexible N‐phenylazole‐based phosphine ligands induced major β‐arylation through migrative cross‐coupling.
Manganese‐Catalyzed Mono‐<i>N</i>‐Methylation of Aliphatic Primary Amines without the Requirement of External High‐Hydrogen Pressure
作者:Jiale Ji、Yinghao Huo、Zhaowen Dai、Zhening Chen、Tao Tu
DOI:10.1002/anie.202318763
日期:2024.3.22
A synergistic strategy enables the selective synthesis of mono-N-methylated aliphaticprimaryamines, including deuterium-labelled drugs. This innovative approach combines an earth-abundant manganese catalyst with a weak base, resulting in a practical and sustainable protocol for mono-N-methylation. By effectively inhibiting the formation of formamide byproducts, it eliminates the need for external