Improved Synthesis of Unsymmetrical <i>N</i>‐Aryl‐<i>N′</i>‐alkylpyridyl ß‐Diketimines Using Molecular Sieves and their Lithium Complexes

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  • Kuldeep Chand
    Department of Medicinal and Applied Chemistry Kaohsiung Medical University 807 Kaohsiung Taiwan
  • Cheng‐Long Tsai
    Department of Medicinal and Applied Chemistry Kaohsiung Medical University 807 Kaohsiung Taiwan
  • Hsuan‐Ying Chen
    Department of Medicinal and Applied Chemistry Kaohsiung Medical University 807 Kaohsiung Taiwan
  • Wei‐Min Ching
    Instrumentation Center National Taiwan Normal University 11677 Department of Chemistry Taiwan
  • Sung‐Po Hsu
    Department of Physiology School of Medicine College of Medicine Taipei Medical University 110 Taipei Taiwan
  • James R. Carey
    Department of Medicinal and Applied Chemistry Kaohsiung Medical University 807 Kaohsiung Taiwan
  • Sodio C. N. Hsu
    Department of Medicinal and Applied Chemistry Kaohsiung Medical University 807 Kaohsiung Taiwan

書誌事項

公開日
2018-03-02
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/ejic.201701383
公開者
Wiley

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説明

<jats:p>The synthesis of unsymmetrical β‐diketimines with <jats:italic>N</jats:italic>‐aryl‐<jats:italic>N′</jats:italic>‐alkyl substitution require at least two condensation steps and tedious purification procedures. An improvement in the preparation of four unsymmetrical <jats:italic>N</jats:italic>‐aryl‐<jats:italic>N′</jats:italic>‐alkylpyridyl β‐diketimine ligands (H<jats:bold>L1</jats:bold>–H<jats:bold>L4</jats:bold>) using 5‐Å molecular sieves is reported. The synthesis of four Li complexes (Li<jats:bold>L1</jats:bold>, Li<jats:bold>L2</jats:bold>, Li<jats:bold>L3</jats:bold>, and Li<jats:bold>L4</jats:bold>) containing <jats:italic>N</jats:italic>‐aryl‐<jats:italic>N′</jats:italic>‐alkylpyridyl β‐diketimines ligands is also presented. All four Li complexes were fully characterized by <jats:sup>1</jats:sup>H NMR spectroscopic, <jats:sup>13</jats:sup>C NMR spectroscopic, and elemental analyses. X‐ray structure analysis and spectroscopic results indicate that the Li β‐diketimine structures and ligand binding modes are governed by the bulkiness of the <jats:italic>N</jats:italic>‐aryl substituent and the length of the pyridyl arm of the <jats:italic>N</jats:italic>‐aryl‐<jats:italic>N′</jats:italic>‐alkyl β‐diketiminate ligand.</jats:p>

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