Chin. J. Org. Chem. ›› 2016, Vol. 36 ›› Issue (3): 613-621.DOI: 10.6023/cjoc201508026 Previous Articles     Next Articles

Articles

InX3(X=F,Br)催化N-甲基吲哚与酮酸酯不对称合成机理的研究

王薇, 毛双, 彭丹, 李来才   

  1. 四川师范大学化学与材料学院 成都 610066
  • 收稿日期:2015-08-26 修回日期:2015-10-21 出版日期:2016-03-25 发布日期:2015-11-06
  • 通讯作者: 李来才 E-mail:lilcmail@163.com
  • 基金资助:

    四川省教育厅自然科学基金(No. 13ZA0150)和四川省科技厅自然科学基金(No. 2014JY0099)资助项目.

Investigation on the Mechanism for N-Methylindole and Keto Ester Catalyzed by InX3 (X=F, Br)

Wang Wei, Mao Shuang, Peng Dan, Li Laicai   

  1. College of Chemistry and Material Science, Sichuan Normal University, Chengdu 610066
  • Received:2015-08-26 Revised:2015-10-21 Online:2016-03-25 Published:2015-11-06
  • Supported by:

    Project supported by the Natural Science Foundation of Sichuan Province Department of Education (No. 13ZA0150) and the Natural Science Foundation of Sichuan Province (No. 2014JY0099).

The reaction mechanism for N-methylindole and keto ester catalyzed by InX3 (X=F, Br) was studied by the density functional theory (DFT). The geometries and the frequencies of reactants, intermediates, transition states, and products have been calculated at the B3LYP/6-31+G(d, p) level, dichloroethane (DCE) is used as a solvent and the LanL2DZ basis has been used for In atom. Transition states have been confirmed by the corresponding vibration analysis and intrinsic reaction coordinate (IRC). In addition, nature bond orbital (NBO) and atoms in molecules (AIM) theories have been used to analyze orbital interactions and bond natures. The results showed that the activation energies of rate-determining steps in which N-methylindole reacted with keto ester to form 1,2-adduct and 1,4-adduct were 25.62 and 12.52 kcal/mol catalyzed by InF3 while those were 26.87 and 13.95 kcal/mol when the reaction was catalyzed by InBr3 under the same conditions. Comparing the results of our research, InF3 can effectively catalyze the reaction, and the 1,4-adduct was more likely to be produced. The final result of our theory study agreed with the experimental data, meanwhile, self-consistent reaction field (SCRF) was carried out using the polarized continuum model (PCM) at the same theoretical level for geometry optimizations and frequency calculations in five different salvations. We predicted that the productivity to form 1,4-adduct was more higher catalyzed by InF3 in the solvent of dimethyl sulfoxide (DMSO).

Key words: density functional theory, N-methylindole, reaction mechanism, solvation