可见光催化的高炔丙醇经过1,4芳基迁移实现二氟烷基化反应

doi:10.6023/A16070375

化学学报 ›› 2017, Vol. 75 ›› Issue (1): 60-65.DOI: 10.6023/A16070375 上一篇下一篇

所属专题：有机光化学

研究通讯

可见光催化的高炔丙醇经过1,4芳基迁移实现二氟烷基化反应

周能能^a, 胥攀^a, 李伟鹏^a, 成义祥^a, 朱成建^a,b

a 南京大学化学化工学院配位化学国家重点实验室南京 210093;
b 中国科学院上海有机化学研究所金属有机化学国家重点实验室上海 200032

投稿日期:2016-07-30 修回日期:2016-09-13 发布日期:2016-09-18
通讯作者: 朱成建,E-mail:cjzhu@nju.edu.cn;Tel.:025-83686219 E-mail:cjzhu@nju.edu.cn
基金资助:
项目受国家自然科学基金（Nos.21172106，21174061，21474048，21372114）资助.

Visible Light Promoted Carbodifluoroalkylation of Homopropargylic Alcohols via Concomitant 1,4-Aryl Migration

Zhou Nengneng^a, Xu Pan^a, Li Weipeng^a, Cheng Yixiang^a, Zhu Chengjian^a,b

a State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093;
b State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032

Received:2016-07-30 Revised:2016-09-13 Published:2016-09-18
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21172106, 21174061, 21474048 and 21372114).

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1. 可见光催化的高炔丙醇经过1,4芳基迁移实现二氟烷基化反应.PDF(6125KB)

摘要/Abstract

报道了可见光催化的高炔丙醇经过1，4芳基迁移实现二氟烷基化反应，其中以常见的二氟溴乙酸乙酯作为二氟烷基化试剂，以磷酸氢二钠为碱，反应以N，N-二甲基乙酰胺（DMA）和1，2-二氯乙烷（DCE）的混合溶剂，在室温条件、可见光照射条件下实现的.反应中各种取代基的高炔丙醇都可以很好地得到相应的二氟烷基化产物.该反应为合成一系列二氟戊酸乙酯类化合物提供了简单高效的方法.

关键词: 二氟烷基化, 高炔丙醇, 1,4芳基迁移, 光催化反应

Fluorinated compounds have gained much attention because of their unique electronegativity, metabolic stability and bioavailability, and thus, the synthesis of organofluorine compounds has found wide applications in pharmaceuticals, agrochemicals, and materials science. Among them, the incorporation of a difluoromethyl group (CF₂) into organic compounds is of great concern in medicinal chemistry owing to its isosterism with the hydroxyl group. Therefore, the development of new difluoroalkylation methods has attracted great interest in synthetic organic chemistry. Visible light-driven photocatalysis as an eco-friendly and powerful theme has been widely utilized in organic synthesis. In particular, free radical fluorination is emerging as a powerful tool for C-F bond formation, especially under the catalysis of visible light. Recent progress on the visible light-promoted directing difluoroalkylation using ethyl bromodifluoroacetate provided an efficient approach to the target. Herein, we report a contribution towards visible light induced carbodifluoroalkylation of homopropargylic alcohols with the use of ethyl bromodifluoroacetate as a source of difluorinated moieties. This strategy provides a facile way to access functional-difluorinated alkenes through a tandem radical difluoroalkylation and 1,4-aryl migration process. A representative procedure for this reaction is as following:An oven-dried Schlenk tube (10 mL) was equipped with a magnetic stir bar, homopropargylic alcohols (0.2 mmol), fac-Ir(ppy)₃ (0.02 equiv., 0.004 mmol), 2-bromo-2,2-difluoroacetate (2.5 equiv. 0.5 mmol), Na₂HPO₄ (2 equiv., 0.4 mmol). The flask was evacuated and backfilled with Ar for 3 times. 0.5 mL of dry DMA and 0.5 mL of dry DCE were added with syringe under Ar. The tube was placed at a distance (app. 5 cm) from 33 W fluorescent light bulb, and the resulting solution was stirred at ambient temperature under visible-light irradiation. After the reaction was finished, the mixture was then diluted with MTBE (20 mL×2) and water. The combined organic layers were dried over sodium sulfate and the solvent concentrated in vacuo and the residue was purified by chromatography on silica gel to afford the corresponding products.

Key words: carbodifluoroalkylation, homopropargylic alcohols, 1,4-aryl migration, photoredox catalytic reaction

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周能能, 胥攀, 李伟鹏, 成义祥, 朱成建. 可见光催化的高炔丙醇经过1,4芳基迁移实现二氟烷基化反应[J]. 化学学报, 2017, 75(1): 60-65.

Zhou Nengneng, Xu Pan, Li Weipeng, Cheng Yixiang, Zhu Chengjian. Visible Light Promoted Carbodifluoroalkylation of Homopropargylic Alcohols via Concomitant 1,4-Aryl Migration[J]. Acta Chim. Sinica, 2017, 75(1): 60-65.

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可见光催化的高炔丙醇经过1,4芳基迁移实现二氟烷基化反应

Visible Light Promoted Carbodifluoroalkylation of Homopropargylic Alcohols via Concomitant 1,4-Aryl Migration

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