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The first density functional study on the

Avalos1, Babiano, Clemente

  • 1Departamento de Quimica Organica, Facultad de Ciencias, Universidad de Extremadura, E-06071 Badajoz, Spain.

The Journal of Organic Chemistry
|December 2, 2000
PubMed
Summary
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This study explores hetero-Diels-Alder reactions using computational chemistry. Density functional theory reveals reaction mechanisms and stereoselectivity for 1,2-diaza-1,3-butadiene with various alkenes.

Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Reaction Mechanisms

Background:

  • Hetero-Diels-Alder reactions are crucial in organic synthesis.
  • Understanding reaction pathways and selectivity is key for predicting outcomes.
  • 1,2-diaza-1,3-butadiene is a versatile diene for cycloaddition reactions.

Purpose of the Study:

  • To theoretically investigate the hetero-Diels-Alder reactions of 1,2-diaza-1,3-butadiene with ethylene, methyl vinyl ether, and methyl acrylate.
  • To elucidate the reaction mechanisms, transition state geometries, and stereochemical outcomes.
  • To compare computational findings with existing experimental data.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Utilizing the Becke3LYP/6-31G(d) computational level.

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  • Analysis of transition states, including concertedness, synchronicity, and conformational preferences.

    • Main Results:

    • Reactions with substituted alkenes exhibit concerted but asynchronous transition states.
    • The reaction with methyl vinyl ether shows high endo stereoselectivity and complete regioselectivity, forming the 6-methoxy cycloadduct.
    • The reaction with methyl acrylate results in low regio- and stereoselectivity.
    • Transition states favor s-trans conformation for methyl vinyl ether and s-cis for methyl acrylate.

    Conclusions:

    • Computational methods accurately predict experimental outcomes for these hetero-Diels-Alder reactions.
    • The electronic and steric factors influence the regioselectivity and stereoselectivity of the cycloadditions.
    • Conformational preferences in transition states play a significant role in determining reaction outcomes.