AuCl3催化2-(1-炔基)-2-烯基酮合成多取代呋喃的机理

doi:10.3866/PKU.WHXB20110338

物理化学学报 >> 2011, Vol. 27 >> Issue (03): 577-583.doi: 10.3866/PKU.WHXB20110338

AuCl₃催化2-(1-炔基)-2-烯基酮合成多取代呋喃的机理

安小应, 何荣幸, 黄成, 李明

西南大学化学化工学院, 重庆 400715

收稿日期:2010-10-17 修回日期:2010-12-28 发布日期:2011-03-03
通讯作者: 李明 E-mail:liming@swu.edu.cn
基金资助:
教育部科学技术重点项目(104263)资助

Mechanism of AuCl₃-Catalyzed Synthesis of Highly Substituted Furans Based on 2-(1-Alkynyl)-2-alken-1-ones

AN Xiao-Ying, HE Rong-Xing, HUANG Cheng, LI Ming

College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China

Received:2010-10-17 Revised:2010-12-28 Published:2011-03-03
Contact: LI Ming E-mail:liming@swu.edu.cn
Supported by:
The project was supported by the Science and Technology Foundation of Ministry of Education, China (104263).

摘要/Abstract

摘要：

采用密度泛函理论的B3LYP泛函对AuCl₃催化的2-(1-炔基)-2-烯基酮与亲核试剂反应的机理进行了研究, 得到了反应的最优路径. 结果表明, 整个反应的决速步骤是羟基H转移到AuCl₃的配体Cl上, 其活化能为49.3 kJ·mol^-1. 通过计算发现, 催化剂AuCl₃的配体Cl原子在反应中有重要的作用, 它不仅稳定配合物, 而且直接参与反应, 协助质子的转移, 显著降低质子转移的活化能(由71.5 kJ·mol^-1降低到49.3 kJ·mol^-1). 另外还讨论了HBF₄不能催化此反应的可能原因, 计算结果与实验结果一致.

关键词: AuCl₃, 机理, 密度泛函理论, 呋喃, 配体

Abstract:

We investigated the mechanism of the AuCl₃-catalyzed synthesis of highly substituted furans from 2-(1-alkynyl)-2-alken-1-ones with nucleophiles using the density functional theory (DFT) with B3LYP function, and obtained the optimal pathway. The rate-determining step of the cyclization is H-migration from the hydroxy group to a ligand Cl of AuCl₃ with a 49.3 kJ·mol^-1 energy barrier. The calculated results show that the ligand Cl of AuCl₃ plays an important role in the reaction, which stabilizes the catalyst and is also directly involved in the reaction. The active energy of proton transfer decreases from 71.5 to 49.3 kJ·mol^-1 by assisting the proton transfer. In addition, the reason why HBF₄ cannot catalyze the cyclization of 2-(1-alkynyl)-2-alken-1-ones is also discussed in this work. The theoretical results are consistent with the experimental observations.

Key words: AuCl₃, Mechanism, Density functional theory, Furan, Ligand

MSC2000:

O641

安小应, 何荣幸, 黄成, 李明. AuCl₃催化2-(1-炔基)-2-烯基酮合成多取代呋喃的机理[J]. 物理化学学报, 2011, 27(03): 577-583.

AN Xiao-Ying, HE Rong-Xing, HUANG Cheng, LI Ming. Mechanism of AuCl₃-Catalyzed Synthesis of Highly Substituted Furans Based on 2-(1-Alkynyl)-2-alken-1-ones[J]. Acta Phys. -Chim. Sin., 2011, 27(03): 577-583.

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AuCl₃催化2-(1-炔基)-2-烯基酮合成多取代呋喃的机理

Mechanism of AuCl₃-Catalyzed Synthesis of Highly Substituted Furans Based on 2-(1-Alkynyl)-2-alken-1-ones

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