铜/手性磷酸催化烯烃不对称自由基胺芳基化

doi:10.6023/A18100413

化学学报 ›› 2018, Vol. 76 ›› Issue (11): 878-882.DOI: 10.6023/A18100413 上一篇下一篇

所属专题：有机小分子-金属协同催化

研究通讯

铜/手性磷酸催化烯烃不对称自由基胺芳基化

李雪飞^a, 林进顺^a, 王建^a, 李忠良^b, 顾强帅^b, 刘心元^a

a. 南方科技大学化学系深圳市格拉布斯研究所深圳 518055;
b. 南方科技大学前沿与交叉科学研究院深圳 518055

投稿日期:2018-10-07 发布日期:2018-10-15
通讯作者: 顾强帅, 刘心元 E-mail:guqs@sustc.edu.cn;liuxy3@sustc.edu.cn
基金资助:
项目受国家自然科学基金（Nos.21722203，21572096）、深圳市科技研发资金（Nos.JCYJ20170412152435366，JCYJ20170307105638498）和深圳市诺贝尔奖科学家实验室（No.C17213101）资助.

Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Radical-Initiated Aminoarylation of Alkenes

Li Xue-Fei^a, Lin Jin-Shun^a, Wang Jian^a, Li Zhong-Liang^b, Gu Qiang-Shuai^b, Liu Xin-Yuan^a

a. Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055;
b. SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055

Received:2018-10-07 Published:2018-10-15
Contact: 10.6023/A18100413 E-mail:guqs@sustc.edu.cn;liuxy3@sustc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21722203, 21572096), the Shenzhen Special Funds (Nos. JCYJ20170412152435366, JCYJ20170307105638498) and the Shenzhen Nobel Prize Scientists Laboratory Project (No. C17213101).

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摘要/Abstract

含β-芳基/α-季碳中心的吡咯烷是一类重要的手性吡咯烷类化合物.目前该类化合物的不对称合成主要是通过钯催化含氮烯烃底物与各类芳基前体的不对称胺芳基化反应来实现的.在这里报道了一种反应机理不同于上述反应的不对称胺芳基化新方法.利用本课题组之前发展的一价铜/手性磷酸组成的金属手性阴离子单电子催化体系成功实现了含氮烯烃底物与芳基重氮盐的不对称自由基的胺芳基化反应，以中等收率和中等至良好的对映选择性得到含β-芳基/α-季碳中心的吡咯烷类化合物.

关键词: 铜催化, 手性磷酸, 自由基, 芳基重氮盐, 不对称胺芳基化

Enantioenriched pyrrolidines bearing a β-aryl group and an α-quaternary carbon stereocenter are important structural motifs in many natural products and pharmaceuticals, and their enantioselective synthesis has thus received extensive attention over the last several decades. Nonetheless, so far as we know, asymmetric aminoarylation of alkenes to access such targets has only been independently reported by Wolfe and Liu using palladium catalysis involving a key aminopalladation step, and thus, general and practical methodologies towards a variety of chiral pyrrolidines are still in demand and highly desirable. As part of our ongoing interest in radical-initiated difunctionalization reactions of alkenes based on Cu(I)/chiral phosphoric acid (CPA) catalysis, we sought to develop a mechanistically distinct and complementary approach for this asymmetric palladium(Ⅱ)-catalyzed aminoarylation of alkenes. Herein we describe our efforts toward the development of the efficient asymmetric radical-initiated aminoarylation of alkenes with aryldiazonium salts enabled by Cu(I)/CPA catalysis. A general procedure for the aminoarylation of alkenes with aryldiazonium salts is as follows:under argon, an oven-dried resealable Schlenk tube equipped with a magnetic stir bar was charged with urea substrate 1 (0.1 mmol, 1.0 equiv.), CuI (1.9 mg, 0.01 mmol, 10 mol%), CPA[(S)-A1 (9.3 mg, 0.015 mmol, 15 mol%], aryldiazonium salts 2 (0.12 mmol, 1.2 equiv.), Na₃PO₄ (19.7 mg, 0.12 mmol, 1.2 equiv.) and isopropyl acetate(1.0 mL) at 32℃ and the sealed tube was then stirred under the same conditions. Upon completion (monitored by thin-layer chromatography), the reaction mixture was directly purified by silica gel chromatography[eluent:V(petroleum ether):V(EtOAc)=100:0 to 3:1] to afford the desired product 3. The enantiometric excess of product was determined by chiral high-performance liquid chromatography (HPLC) analysis. A broad scope of substrates worked well under this standard conditions to afford enantioenriched pyrrolidines in good yield with good to excellent enantioselectivity. A series of control experiments were conducted to determine the reaction mechanism as a radical process and a possible mechanism was proposed.

Key words: copper catalysis, chiral phosphoric acid, radical, aryldiazonium salts, asymmetric aminoarylation

引用此文

李雪飞, 林进顺, 王建, 李忠良, 顾强帅, 刘心元. 铜/手性磷酸催化烯烃不对称自由基胺芳基化[J]. 化学学报, 2018, 76(11): 878-882.

Li Xue-Fei, Lin Jin-Shun, Wang Jian, Li Zhong-Liang, Gu Qiang-Shuai, Liu Xin-Yuan. Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Radical-Initiated Aminoarylation of Alkenes[J]. Acta Chimica Sinica, 2018, 76(11): 878-882.

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铜/手性磷酸催化烯烃不对称自由基胺芳基化

Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Radical-Initiated Aminoarylation of Alkenes

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