Diarylmethylamines are of great interest due to their prevalence in pharmaceutical chemistry. As a result, new methods for their synthesis are in demand. Herein, we report a versatile protocol for the synthesis of diarylmethylamine derivatives involving palladium-catalyzed arylation of generated 2-azaallyl anion intermediates. The 2-azaallyl anions are generated by reversible deprotonation of readily available aldimine and ketimine precursors. Importantly, the arylated aldimine and ketimine products do not undergo isomerization under the reaction conditions. Scale-up of the arylation and hydrolysis of the resulting products to furnish diarylmethylamines were also successfully performed.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4225812 | PMC |
http://dx.doi.org/10.1039/C3SC53526F | DOI Listing |
Nat Commun
November 2024
State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai, China.
Hydroxybenzylamines are prevalent in drugs and bioactive molecules, including various antimalarial and anticancer drugs. α-tertiary alkylation of amines impacts drug-target interactions significantly through their influence on basicity and lipophilicity. Traditional N-alkylation methods, especially for α-tertiary amines, suffer from limitations due to high energy barriers from steric hindrance.
View Article and Find Full Text PDFMolecules
March 2024
Department of Chemistry, University of Maryland, College Park, MD 20742, USA.
The Schiff base condensation of 5-methyl-4-imidazole carboxaldehyde, 5Me4ImCHO, and the anion of an amino acid, HN-CH(R)CO (R = -CH, -CH(CH) and -CHCH(CH)), gives the aldimine tautomer, Im-CH=N-CH(R)CO, while that of 5-methylimidazole-4-methanamine, 5MeIm-4-CHNH, with a 2-oxocarboxylate anion, R-C(O)-CO, gives the isomeric ketimine tautomer, Im-CH-N=C(R)CO. All are isolated as the neutral nickel(II) complexes, NiL, and are characterized by single crystal structure determination, IR, and positive ion ESI MS. In the cases of the 4 substituted imidazoles, either 5MeIm-4-CHO or 5MeIm-4-CHNH, both the aldimine and ketimine complexes are isolated cleanly with no evidence of an equilibrium between the two tautomers under the experimental conditions.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
February 2024
Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
Chromium-catalyzed enantioselective Nozaki-Hiyama-Kishi (NHK) reaction represents one of the most powerful approaches for the formation of chiral carbon-heteroatom bond. However, the construction of sterically encumbered tetrasubstituted stereocenter through NHK reaction still posts a significant challenge. Herein, we disclose a cobalt-catalyzed aza-NHK reaction of ketimine with alkenyl halide to provide a convenient synthetic approach for the manufacture of enantioenriched tetrasubstituted α-vinylic amino acid.
View Article and Find Full Text PDFJ Phys Chem B
January 2024
Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.
Dalton Trans
August 2023
Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
The first examples of regioselective aryl -C-H functionalization with diphenyldiazomethane for the construction of C-N bonds were accomplished the activation of C-H bonds and the subsequent reaction of diphenyldiazomethane with the RE-C bond. The reactions of rare-earth metal monoalkyl complexes LRE(CHSiMe)(THF) (L = 2,5-[(2-pyrrolyl)CPh](-Me-pyrrole)) supported by a neutral -methylpyrrole anchored dipyrrolyl ligand with 2 equiv. of PhCN gave irreversibly unprecedented hydrazonato-functionalized imino rare-earth metal complexes LRE(PhCNNCH-(-CNHPh) (RE = Y (2a), Lu (2a')) in good yields involving a rather complex process including the interaction of a diazo unit with a RE-C bond, a β-H elimination, a N-N cleavage, 1,4-hydrogen transfer and the subsequent C-N coupling with another diphenyldiazomethane.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!