Rh/Ag双金属催化的碳氢键氧化Heck反应研究

doi:10.6023/A15050322

化学学报 ›› 2015, Vol. 73 ›› Issue (12): 1315-1319.DOI: 10.6023/A15050322 上一篇

所属专题：碳氢键官能团化

研究通讯

Rh/Ag双金属催化的碳氢键氧化Heck反应研究

鲁平^a, 冯超^a,b, 罗德平^a,b

a 中国科技大学化学与材料科学学院化学系合肥 230026;
b 南洋理工大学数理学院化学与生物化学系新加坡 637616

投稿日期:2015-05-10 发布日期:2015-06-15
通讯作者: 冯超, 罗德平 E-mail:fengchao@ntu.edu.sg;teckpeng@ntu.edu.sg
基金资助:
项目受国家自然科学基金(Nos.21372210,21432009)资助.

Rh/Ag Bimetallic Catalyzed C-H Bond Olefination of Benzonitriles

Lu Ping^a, Feng Chao^a,b, Loh Teck-Peng^a,b

a Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China;
b Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637616

Received:2015-05-10 Published:2015-06-15
Supported by:
Project supported by the National Natural Science Foundation of China(Nos. 21372210, 21432009).

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摘要/Abstract

报道了Rh/Ag双金属催化的苯甲腈类底物碳氢键氧化烯基化反应,并合成了一系列苯甲酰胺类衍生物.另外,对反应的机理也做了研究,提出了一个可能的机理.

关键词: 铑催化, 双金属催化, 碳氢键活化, 氧化Heck反应, 苯甲腈

Transition-metal-catalyzed C-H functionalization emerges as an atom-economical and highly efficient strategy in the synthetic organic chemistry. In this regard, oxidative Heck reaction, pioneered by Fujiwara and Moritani, represents a great evolvement to the traditional Heck reaction by obviating the substrate preactivation. While palladium was routinely adopted as the catalyst of choice because of its well established catalytic activities, other transition metals, especially rhodium also proved to be suitable candidate in pursuit of such oxidative C-H alkenylation because of its low catalyst loading, high efficiency and function group tolerance. Under such circumstance, the Rh(Ⅲ)-catalyzed oxidative C-H alkenylation has witness a great advancement in the past decade, with many functionalities such as-COOH,-CONHR, CO₂Et, NHAc etc. being explored as suitable directing groups for the initiation of C-H activation. However, most of these directing groups needed prior installation. With our continuing interest in Rh(Ⅲ)-catalyzed C-H functionalization, herein we would like to present a nitrile based bimetallic Rh/Ag catalyzed C-H alkenylation reaction. In this protocol, nitrile was assumed to transform into imine which then took part into the Rh(Ⅲ) catalyzed C-H bond olefination reation. With such reaction cascade, a library of ortho-alkenylated benzamides could be directly obtained from benzonitriles in one pot fashion. All the substrates are commercially available and easy to obtain. A general procedure for the bimetallic Rh/Ag catalyzed C-H olefination of benzonitriles:an oven-dried 10 mL Schlenk tube was charged with nitrile 1(If the nitrile was solid, 0.2 mmol),[RhCp*Cl₂]₂(6.2 mg, 0.01 mmol), AgSbF₆(13.8 mg, 0.04 mmol) in sequence, followed by refilling with N₂. Then olefins 2(0.5 mmol), nitriles 1(If the nitrile was liquid, 0.2 mmol) and AcOH were added through syringe. After stirring at 120℃ for 24 h, the reaction mixture was cooled to room temperature and filtered through a celite plug. The solvent was removed in vacuo and the residue was purified by column chromatography to afford the desired product 3.

Key words: rhodium, bimetallic catalyzed reaction, C-H activation, oxidative Heck reaction, benzonitriles

引用此文

鲁平, 冯超, 罗德平. Rh/Ag双金属催化的碳氢键氧化Heck反应研究[J]. 化学学报, 2015, 73(12): 1315-1319.

Lu Ping, Feng Chao, Loh Teck-Peng. Rh/Ag Bimetallic Catalyzed C-H Bond Olefination of Benzonitriles[J]. Acta Chim. Sinica, 2015, 73(12): 1315-1319.

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Rh/Ag双金属催化的碳氢键氧化Heck反应研究

Rh/Ag Bimetallic Catalyzed C-H Bond Olefination of Benzonitriles

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