Nickel-Catalyzed Cross-Coupling of gem-Difluoropropargyl Bromide with Aryl Boronic Acids

doi:10.6023/A15010042

Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (5): 383-387.DOI: 10.6023/A15010042 Previous Articles Next Articles

Communication

镍催化的芳基硼酸偕二氟炔丙基化反应

肖玉兰, 潘强, 张新刚

中国科学院上海有机化学研究所中国科学院有机氟化学重点实验室上海 200032

投稿日期:2015-01-15 发布日期:2015-02-20
通讯作者: 张新刚 E-mail:xgzhang@sioc.ac.cn
基金资助:
项目受国家重点基础研究发展计划(973计划)(No. 2015CB931900)和国家自然科学基金(Nos. 21425208, 21421002)资助.

Nickel-Catalyzed Cross-Coupling of gem-Difluoropropargyl Bromide with Aryl Boronic Acids

Xiao Yulan, Pan Qiang, Zhang Xingang

Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032

Received:2015-01-15 Published:2015-02-20
Supported by:
Project supported by the National Basic Research Program of China (973 Program) (No. 2015CB931900) and the National Natural Science Foundation of China (Nos. 21425208 and 21421002).

1. Nickel-Catalyzed Cross-Coupling of gem-Difluoropropargyl Bromide with Aryl Boronic Acids.PDF(2709KB)

Abstract

The gem-difluoropropargylated arenes play an important role in life and material sciences owning to the unique properties of the difluoromethylene group (CF₂). The traditional method to access such a kind of fluorinated structure relies on conversion of carbonyl group with aminosulfurtrifluorides, such as DAST and Deoxofluor. However, these reactions suffer from the use of expensive and toxic fluorinated reagents and the important functional group incompatibility. Hence, it is highly desirable to develop new and efficient strategies and methods to prepare gem-difluoropropargylated arenes. As part of our ongoing interest in transition-metal-catalyzed difluoroalkylation reactions, herein, we report a nickel-catalyzed cross-coupling of gem-difluoropropargyl bromide with aryl boronic acids. The reaction uses low-cost Ni-catalyst and proceeds under mild reaction conditions with high efficiency and good functional group compatibility. It is also possible for gram-scale reaction and late stage gem-difluoropropargylation of bioactive natural product, thus providing a facile route for application in drug discovery and development. A representative procedure for nickel-catalyzed cross-coupling of gem-difluoropropargyl bromide with aryl boronic acids is as following: Phenylboronic acid 1a (1.5 equiv.), Ni(NO₃)₂·6H₂O or NiCl₂·dppe (2.5 mol%), bpy (2.5 mol%), and K₂CO₃ (2.0 equiv.) were subsequently added to a 25 mL of Schlenck tube. The resulting mixture was then evacuated and backfilled with Ar (3 times). gem-Difluoropropargyl bromide 2 (0.6 mmol, 1.0 equiv.) and 1,4-dioxane (4 mL) were then added. The Schlenck tube was screw capped and put into a preheated oil bath (80 ℃). After stirring for 24 h, the reaction mixture was cooled to room temperature. The yield was determined by ¹⁹F NMR before working up. If necessary, the reaction mixture was diluted with EtOAc and filtered with a pad of cellite. The filtrate was concentrated, and the residue was purified with silica gel chromatography (100% Petroleum ether) to give product 3a.

Key words: nickel, aryl boronic acids, gem-difluoropropargyl bromide, cross-coupling reaction

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Xiao Yulan, Pan Qiang, Zhang Xingang. Nickel-Catalyzed Cross-Coupling of gem-Difluoropropargyl Bromide with Aryl Boronic Acids[J]. Acta Chim. Sinica, 2015, 73(5): 383-387.

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镍催化的芳基硼酸偕二氟炔丙基化反应

Nickel-Catalyzed Cross-Coupling of gem-Difluoropropargyl Bromide with Aryl Boronic Acids

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