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The relationship between chemical structure and basicity in some morpholine compounds.

A H Beckett, P Kourounakis

    Arzneimittel-Forschung
    |January 1, 1976
    PubMed
    Summary
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    Substituents affect the acidity (pKa) of 2-phenylmorpholines, influencing their molecular shape and electronic properties. This acidity may explain why these compounds lack pain-relieving (analgesic) effects.

    Area of Science:

    • Medicinal Chemistry
    • Organic Chemistry
    • Physical Chemistry

    Background:

    • 2-phenylmorpholines are a class of organic compounds with potential biological applications.
    • Understanding the physicochemical properties of these compounds is crucial for drug design.
    • Acidity, quantified by pKa, is a key factor influencing drug absorption, distribution, metabolism, and excretion (ADME).

    Purpose of the Study:

    • To investigate the impact of various substituents on the pKa values of 2-phenylmorpholine derivatives.
    • To correlate pKa values with the conformational preferences and electronic effects within the 2-phenylmorpholine series.
    • To explore the relationship between pKa and the observed lack of analgesic activity.

    Main Methods:

    • Synthesis of a series of substituted 2-phenylmorpholines.

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  • Determination of pKa values using appropriate experimental or computational methods.
  • Analysis of substituent effects using conformational analysis and inductive effect principles.

    • Main Results:

    • The pKa values of 2-phenylmorpholines are significantly influenced by the nature and position of substituents.
    • Specific substituent patterns correlate with preferred conformations of the morpholine ring.
    • A clear relationship was observed between lower pKa values and the absence of analgesic activity.

    Conclusions:

    • The acidity of 2-phenylmorpholines is modulated by substituent-induced electronic and conformational changes.
    • Low pKa values are identified as a potential reason for the lack of analgesic properties in this compound series.
    • Further research may focus on modifying substituents to enhance pKa and potentially restore biological activity.