Intramolecular Diels-Alder reaction in enyne-allenes: A computational investigation and comparison with the Myers-Saito and Schmittel reactions

Hsin Tsung Chen, Hui Lung Chen*, Jia-Jen Ho

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)

摘要

The reaction mechanisms as well as substituted effect and solvent effect of the enyne-allenes are investigated by Density Functional Theory (DFT) method and compared with the Myers-Saito and Schmittel reactions. The Myers-Saito reaction of non-substituted enyne-allenes is kinetically and thermodynamically favored as compared to the Schmittel reaction; while the concerted [4 + 2] cycloaddition is only 1.32 kcal/mol higher than the C 2 -C 7 cyclization and more exothermic (δ R E = -69.38 kcal/mol). For R1=CH 3 and t-Bu, the increasing barrier of the C 2 -C 7 cyclization is higher than that for the C 2 -C 6 cyclization because of the steric effect, so the increased barrier of the [4 + 2] cycloaddition is affected by such substituted electron-releasing group. Moreover, the strong steric effect of R 1 = t-Bu would shift the C 2 -C 7 cyclization to the [4 + 2] cycloaddition. On the other hand, for R 1 =Ph, NH 2 , O - , NO 2 , and CN substituents, the barrier of the C 2 -C 6 cyclization would be more diminished than the C 2 -C 7 cyclization due to strong mesomeric effect; the reaction path of C 2 -C 7 cyclization would also shift to the [4 + 2] cycloaddition. The solvation does not lead to significant changes in the potential-energy surface of the reaction except for the more polar surrounding solvent such as dimethyl sulfoxide (DMSO), or water.

原文英語
頁(從 - 到)134-140
頁數7
期刊Journal of Physical Organic Chemistry
23
發行號2
DOIs
出版狀態已發佈 - 2010 二月 1

ASJC Scopus subject areas

  • 物理與理論化學
  • 有機化學

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