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.
Formation of benzylamines from triazene compounds via a 1,2-proton shift
A new approach to benzylamines using triazene compounds has been developed that is facilitated by the lithiation of aryltriazenes followed by treatment with an electrophile. The regioselectivity of the reaction can be controlled by means of the substituents in the aryl group. The reaction contains the following steps: intramolecular carbon-carbon bond formation involving lithiation of an alkyl group on a 3-nitrogen atom; a 1,2-proton shift; and the subsequent release of nitrogen gas. Through the use of a deuterated triazene, we were able to determine that the reaction proceeds through a 1,2-proton shift. (c) 2006 Elsevier Ltd. All rights reserved.
α-Lithiation of 1-Aryl-3,3-dialkyltriazenes and Intramolecular Conversion to Benzylamine and Tetrahydrobenzotriazine Derivatives