高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (7): 2299.doi: 10.7503/cjcu20210157

• 研究论文 • 上一篇    下一篇

金催化炔基苯并二𫫇英环化合成8-羟基异香豆素的理论研究

杨一莹, 朱荣秀, 张冬菊(), 刘成卜()   

  1. 山东大学化学与化工学院, 理论化学研究所, 济南 250100
  • 收稿日期:2021-03-09 出版日期:2021-07-10 发布日期:2021-04-16
  • 通讯作者: 张冬菊 E-mail:zhangdj@sdu.edu.cn;cbliu@sdu.edu.cn
  • 作者简介:刘成卜, 男, 博士, 教授, 主要从事量子化学基础理论与应用研究. E-mail: cbliu@sdu.edu.cn
  • 基金资助:
    国家自然科学基金(21773139);中国博士后基金(BX20190189);山东省自然科学基金(ZR2020QB077)

Theoretical Study on Gold-catalyzed Cyclization of Alkynyl Benzodioxin to 8-Hydroxy-isocoumarin

YANG Yiying, ZHU Rongxiu, ZHANG Dongju(), LIU Chengbu()   

  1. Institute of Theoretical Chemistry,School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China
  • Received:2021-03-09 Online:2021-07-10 Published:2021-04-16
  • Contact: ZHANG Dongju E-mail:zhangdj@sdu.edu.cn;cbliu@sdu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21773139);the China Postdoctoral Science Foundation(BX20190189);the Natural Science Foundation of Shandong Province, China(ZR2020QB077)

摘要:

通过密度泛函理论(DFT)计算对金催化炔基苯并二??英环化合成8-羟基异香豆素反应进行了研究, 探讨了详细的分子机理, 获得了一些与实验研究不同的认知. 水分子既是反应物又扮演了质子梭的角色, 与金络合物协同作用促进反应在温和条件下进行; 亲核加成的优势进攻位点为底物远离氧杂苯环一侧的C(sp3)原子, 导致底物中C(sp3)—O键断裂; 新的C—O键形成与底物中C—O键的断裂遵循分步机制; 副产物丙酮中的氧来源于反应体系中水的贡献; 反应的区域选择性起源于取代基诱导的炔基π电子极化.

关键词: 金催化, 密度泛函理论, 苯并二&#x2bac7, 英, 环异构化, 反应机理

Abstract:

Density functional theory(DFT) calculations were carried out on the gold-catalyzed cyclization of alkynyl benzodioxin to 8-hydroxy-isocoumarin reaction to show the molecular mechanism of the reaction. The conclusions obtained from this work are different from those in the previous experimental study. The results show that water molecule acts as both the reactant and the proton shuttle, and promotes the reaction with gold complexes under mild conditions. The nucleophilic addition site of water on the substrate is the C(sp3) atom on the side of the substrate far away from the oxabenzene ring, resulting in C(sp3)—O bond breaking in the substrate. The formation of new C—O bond and the cleavage of C—O bond in the substrate follow a step-by-step mechanism. The oxygen in the side-product acetone comes from the contribution of water in the reaction system. The regioselectivity of the reaction originates from the polarization of alkynyl π-electrons induced by substituents.

Key words: Gold catalysis, Density functional theory, Alkynyl benzodioxin, Cycloisomerization, Reaction mechanism

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