Ammonium Chloride/B(C6F5)3 System Catalyzed Selective Addition of Acids to Alkynes

doi:10.6023/A16040164

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (6): 498-502.DOI: 10.6023/A16040164 Previous Articles Next Articles

Communication

有机胺盐酸盐/B(C₆F₅)₃催化的酸与炔烃选择性加成反应研究

温志国, 田冲, Borzov Maxim V., 聂万丽

天然产物与小分子合成四川省高校重点实验室乐山师范学院化学学院四川乐山 614000

投稿日期:2016-04-05 发布日期:2016-04-26
通讯作者: 聂万丽 E-mail:niewl126@126.com
基金资助:
项目受国家自然科学基金(No. 21542011)和四川省教育厅(15ZA0279)资助.

Ammonium Chloride/B(C₆F₅)₃ System Catalyzed Selective Addition of Acids to Alkynes

Wen Zhiguo, Tian Chong, Borzov Maxim V., Nie Wanli

Sichuan Province Key Laboratory of Natural Products and Small Molecule Synthesis, Chemical Department of Leshan Normal University, Leshan 614000, China

Received:2016-04-05 Published:2016-04-26
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21542011), and Scientific Research Fund of Sichuan Provincial Educational Department (15ZA0279).

1. Ammonium Chloride/B(C₆F₅)₃ System Catalyzed Selective Addition of Acids to Alkynes.PDF(554KB)

Abstract

Development of straightforward and selective approaches to functionalize vinyl groups is an important and continuing goal. A novel convenient route to vinylhalides or enol esters by a Markovnikov regioselective addition of hydrogen chloride or carboxylic acid to the C≡C bond of alkynes in the presence of an ammonium hydrochloride/B(C₆F₅)₃ catalytic system is reported. Thus, when treated with catalytic amounts of ammonium hydroborate ([TMPH]⁺[Cl-B(C₆F₅)₃]^-), equimolar mixtures of hydrogen chloride and alkynes are converted into a variety of chloroalkenes as monoadducts. The yields of the monoadducts are usually higher than 90% for terminal aromatic alkynes, while for the terminal aliphatic alkynes they are considerably lower, with the worst observed for sterically hindered tert-butylacetylene (only 67%). NMR monitoring of the reaction mixtures reveals that under ambient conditions the main by-products are the corresponding diadducts (gem-dihalides). At higher temperatures (50 ℃) for equimolar alkyne/HCl mixtures or at ambient temperature for alkyne-enriched mixtures, the diadduct formation can be nearly completely suppressed. Noteworthy, that both ammonium and borane (-ate) components of the catalytic system are essential for the conversion success. In the case of trifuoroacetic acid addition to alkynes, presence of the ammonium component is not required, with the reaction yields usually exceeding 95% for terminal aromatic alkynes and being modest to good for the aliphatic ones. The reported catalytic system presents the first example of the “metal-free” catalysts for the selective addition of acids to alkynes.

Key words: frustrated Lewis pairs, ammonium chloride, acid, alkyne, addition reaction

Cite this article

Wen Zhiguo, Tian Chong, Borzov Maxim V., Nie Wanli. Ammonium Chloride/B(C₆F₅)₃ System Catalyzed Selective Addition of Acids to Alkynes[J]. Acta Chim. Sinica, 2016, 74(6): 498-502.

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有机胺盐酸盐/B(C₆F₅)₃催化的酸与炔烃选择性加成反应研究

Ammonium Chloride/B(C₆F₅)₃ System Catalyzed Selective Addition of Acids to Alkynes

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有机胺盐酸盐/B(C6F5)3催化的酸与炔烃选择性加成反应研究