Zinc Complexes ofβ‐Ketoiminato Ligands as Efficient Catalysts for the Synthesis of α‐Amino Nitriles via Strecker Reaction

Das, Suman and Kumar, Ravi and Devadkar, Ajitrao and Panda, Tarun K. (2020) Zinc Complexes ofβ‐Ketoiminato Ligands as Efficient Catalysts for the Synthesis of α‐Amino Nitriles via Strecker Reaction. Asian Journal of Organic Chemistry, 9 (8). pp. 1217-1224. ISSN 2193-5807

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Abstract

We report the synthesis of α-aminonitriles by one-pot coupling reaction of aldehyde, amines and trimethylsilyl cyanide (TMSCN) using β-ketoiminato zinc complexes as a pre-catalyst in very good yield under mild reaction condition. Homoleptic zinc complex [{κ2-(2,4,6-Me3C6H2NC(Me)=CHC(Me)=O)}2Zn] (1 a) was synthesized by the treatment of protic ligand [(2,4,6-Me3C6H2NHC(Me)=CHC(Me)=O)] (L1H) with potassium hydride and anhydrous zinc diiodide in 2 : 2 : 1 molar ratio in THF. Analogous reactions using [(2,6-iPr2C6H3NHC(Me)=CHC(Me)=O)] (L2H) and [(Ph2CHNHC(Me)=CHC(Me)=O)] (L3H) as protic ligands, dinuclear zinc complexes [{κ3-(2,6-iPr2C6H3NC(Me)=CHC(Me)=O)}ZnI]2 (1 b) and [Zn(Ph2CHNHC−(Me)=CHC(Me)=O)ZnI2] (1 c) were obtained in good yield. Molecular structures of ligands L1H, L3H, and zinc complexes 1 a, 1 b, and 1 c were established by single-crystal x-ray diffraction analysis. Dinuclear zinc complexes 1 b, and 1 c exhibited high transformation, greater selectivity and broad substrate scope for the synthesis of α-aminonitrile under mild condition. A most plausible mechanism for synthesis α-aminonitrile is proposed based on several controlled reactions.

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IITH Creators:
IITH CreatorsORCiD
Panda, Tarun Khttp://orcid.org/0000-0003-0975-0118
Item Type: Article
Uncontrolled Keywords: Carbonyl compounds; Strecker reaction; Zinc; α-amino nitrile; β-ketoiminato
Subjects: Chemistry
Chemistry > Inorganic chemistry
Divisions: Department of Chemistry
Depositing User: . LibTrainee 2021
Date Deposited: 15 Jun 2021 05:46
Last Modified: 15 Jun 2021 05:46
URI: http://raiithold.iith.ac.in/id/eprint/7913
Publisher URL: http://doi.org/10.1002/ajoc.202000278
OA policy: https://v2.sherpa.ac.uk/id/publication/22827
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